JP7142940B2 - Evaporator - Google Patents

Description

TECHNICAL FIELD The present invention relates to an evaporator, and more particularly to an evaporator capable of efficiently recovering and concentrating a solvent from a liquid.

For example, in the fields of the food industry and chemical industry, evaporators called "falling film evaporators" are used to recover or concentrate solvents from liquids containing contaminants and impurities.

FIG. 13 is a diagram schematically showing an evaporation system provided with a conventional falling film evaporator.

The evaporation system 900 includes a raw material tank 910 containing a raw material liquid, a falling film evaporator 800 , a vacuum pump 920 and a condenser 930 . A raw material liquid is once preheated by a preheater 906 through a pipe 904 driven by a pump 902 from a raw material tank 910 and then fed to an evaporator 800 .

FIG. 14 is a diagram schematically showing a part of a cross section of an evaporator 800 that constitutes the evaporation system shown in FIG. 13. As shown in FIG.

As shown in FIG. 14, the evaporator 800 includes a stirring tank 810, a first rotating shaft 820 extending vertically in the stirring tank 810 and rotatable in the horizontal direction, and A plurality of posts 822 each extending horizontally from the first rotating shaft 820 , and rollers 826 extending downward from the posts 822 and provided to contact the inner wall of the stirring vessel 810 are provided. The outer periphery of the first rotating shaft 820 is covered with a second rotating shaft 821, and the first rotating shaft 820 and the second rotating shaft 821 are independently rotatably connected to the drive motor section 840. there is Further, in many other conventional evaporators, the first rotating shaft 820 and the second rotating shaft 821 are integrally formed and rotate at the same number of revolutions.

A raw material liquid 834 fed from a raw material tank is supplied above the inner wall of the stirring tank 810 through a supply port 832 extending horizontally from a second rotating shaft 821 while being rotated by a drive motor section 840 . After that, the raw material liquid 834 flows down along the inner wall of the stirring tank 810 while forming a wet surface downward. On the other hand, the outer circumference of the stirring vessel 810 is covered with a jacket 812 that can be heated by, for example, steam, and the heating through the jacket 812 evaporates the volatile components contained in the raw material liquid while flowing down. The evaporated volatile components are sent through an evaporation outlet 860 to a condenser 930 (FIG. 13) provided outside the evaporator 800, cooled in the condenser 930, and recovered as a distillate. On the other hand, in FIG. 14, components other than the volatile components contained in the raw material liquid flow down the inner wall of the stirring vessel 810 as they are, and are discharged to the outside of the evaporator 800 through the outlet 880 provided at the bottom of the stirring vessel 810. be.

As the raw material liquid flows down in the stirring vessel 810 , the rollers 826 provided on the support columns 822 are driven by the driving motor section 840 to rotate while being in contact with the inner wall of the stirring vessel 810 .

FIG. 15 is a diagram schematically showing a cross section in the AA direction of the conventional evaporator 800 shown in FIG. In the evaporator 800, the roller 826 contacts and rotates the inner wall of the stirring vessel 810 heated by the jacket 812, thereby forcibly renewing the surface of the raw material liquid existing on the heat transfer surface of the inner wall, thereby increasing the evaporation efficiency. can be done. Although the roller 826 is provided in FIG. 15, a wiper may be provided instead of the roller 826 in a conventional evaporator.

However, several concerns have been pointed out with such evaporators.

One is that the supplied raw material liquid passes through the inner wall (heat transfer surface) in the stirring tank in one flow down by so-called "one pass". Even if the raw material liquid contains a large amount of volatile components, or if the volatile components cannot sufficiently evaporate before flowing down the inner wall, the remaining components can be discharged from the discharge port 980 as they are. be done. For this reason, it has been considered difficult to use it for raw material liquids that require sufficient concentration.

Also, the rollers or wipers shown in FIG. 14 are prone to wear because they are always in contact with the heat transfer surface. For this reason, it has been pointed out that periodic replacement is required, increasing work time, labor, and costs for maintenance.

Furthermore, when the evaporator is stopped, the temperature of the inner wall is higher than the liquid temperature, so if the supply of the raw material liquid is stopped as it is, the roller or wiper in contact with the inner wall is deformed or deteriorated due to high heat. Therefore, when the evaporator is stopped, it is necessary to continue supplying the raw material liquid until the temperature of the inner wall is lowered.

An object of the present invention is to solve the above problems, and an object of the present invention is to efficiently evaporate the volatile components from the raw material liquid, and to eliminate the complexity of maintenance and repair. It is to provide a device.

The present invention provides a stirring vessel supplied with a raw material liquid and provided with a volatile component outlet and a concentrated liquid outlet;
An evaporator, comprising: a liquid dispersion unit provided in the stirring tank and configured to flow down the raw material liquid to a heat-generating portion in the stirring tank,
(a) the stirring tank includes at least one reservoir surrounded by the bottom of the stirring tank and the inner wall and temporarily storing the flowing raw material liquid;
(b) the dispersion part is
Axis of rotation;
A liquid receiving portion including one end portion is arranged to be inserted into the storage portion, and the raw material liquid temporarily stored in the storage portion is supplied to the storage portion as the rotary shaft rotates. at least one channel member provided with a flow path through which fluid flows from the bottom to the top of the agitation tank; and a fitting that connects the rotating shaft and the channel member;
and (c) said channel member extends horizontally at said one end of:
a raw material introduction portion extending from a base point constituting the outermost periphery of the rotational trajectory of the channel member formed by rotation of the rotary shaft to a raw material introduction edge positioned at the tip in the traveling direction of the rotation; and an absolute value of an intersection angle _θK between an imaginary straight line including the raw material introduction edge and the base point and a tangent line to the outermost circumference at the base point is 0° to 10° with respect to the tangent line to the outermost circumference. , a raw material liquid introducing portion; and a flow channel forming portion extending from the base point of the outermost periphery to a flow channel forming edge located on the opposite side of the traveling direction due to the rotation;
It is an evaporator consisting of

In one embodiment, the heat-generating portion of the stirring vessel is the inner wall of the stirring vessel, and the inner wall is heated by a jacket provided on the outer circumference of the stirring vessel.

In one embodiment, the raw material introduction portion of the channel member is spread toward the rotating shaft in the horizontal direction of the one end with respect to the traveling direction of the rotation of the rotating shaft.

In a further embodiment, the raw material introduction portion of the channel member is designed to be substantially parallel to the inner wall of the stirring vessel in the horizontal direction of the one end.

In one embodiment, the concentrate outlet is provided at the bottom of the stirred vessel.

In a further embodiment, the volatiles outlet is provided at the bottom of the stirring vessel, a condenser is provided in the center of the stirring vessel, and volatiles evaporated from the raw material liquid are condensed in the condenser. , is discharged through the volatiles outlet.

The present invention also provides a raw material tank containing the raw material liquid,
the evaporator for processing the raw material liquid supplied from the raw material tank;
a condenser for condensing the volatiles discharged from the volatiles outlet of the evaporator;
An evaporation system comprising:

The present invention also provides a raw material tank containing the raw material liquid,
the evaporator for processing the raw material liquid supplied from the raw material tank;
An evaporation system comprising:

According to the present invention, a raw material liquid temporarily stored in a reservoir in a stirring tank is caused to flow from the bottom to the top of the stirring tank by rotation, and the raw material liquid is dispersed from the top. A dispersion unit provided in an evaporator that flows down to a heat-generating part in the stirring tank and evaporates,
Axis of rotation;
A liquid receiving portion including one end portion is arranged to be inserted into the storage portion, and the raw material liquid temporarily stored in the storage portion is supplied to the storage portion as the rotary shaft rotates. at least one channel member provided with a flow path through which fluid flows from the bottom to the top of the agitation tank; and a fitting that connects the rotating shaft and the channel member;
and said channel member extends horizontally at said one end of:
a raw material introduction portion extending from a base point constituting the outermost periphery of the rotational trajectory of the channel member formed by rotation of the rotary shaft to a raw material introduction edge positioned at the tip in the traveling direction of the rotation; and an absolute value of an intersection angle _θK between an imaginary straight line including the raw material introduction edge and the base point and a tangent line to the outermost circumference at the base point is 0° to 10° with respect to the tangent line to the outermost circumference. , a raw material liquid introducing portion; and a flow channel forming portion extending from the base point of the outermost periphery to a flow channel forming edge located on the opposite side of the traveling direction due to the rotation;
It is a dispersion part composed of.

According to the present invention, it is possible to efficiently evaporate volatile components from the raw material liquid without using members such as rollers and wipers. This makes it possible to prepare a more concentrated concentrated liquid from the raw material liquid. Furthermore, according to the present invention, it is possible to avoid the possibility of seizure of members in the agitating tank.

1 is a schematic end view showing an example of an evaporator of the present invention; FIG. FIG. 4 is a diagram schematically showing an example of a channel member that can be used in the liquid dispersion section that constitutes the evaporator of the present invention, and is a perspective view of the channel member attached to a fixture; FIG. 3 is _a bottom view of the channel member attached to the _fixture shown in FIG. FIG. 3 is a diagram for explaining an intersection angle _θK formed by an edge portion _H and a virtual straight line LH including a base point K; 3A is a view for explaining the structure of the intermediate portion of the channel member attached to the fixture shown in FIG. 2, where (a) is arranged in a cross section of the fixture and the channel member in the BB direction of FIG. 2; _Fig . 10(b) is a diagram showing the positional relationship _among the axial center O1, the base point K2 forming the outermost circumference _C2 of the rotational trajectory of the channel member, and the edge H2 of the flow path expansion portion, and ( _b ) _A tangent line L _K2 passing through a base point _K2 forming an outermost circumference _C2 of the rotational trajectory of the channel member, which is determined by the axis _O1 , the base _point K2, and the edge H2 of the flow passage extension, and the flow passage _FIG . 10 is a diagram for explaining an intersection angle θ _K2 formed by an edge _H2 of an extension and an imaginary straight line _LH2 including a base point K2; FIG. 4 is a schematic end view showing another example of the evaporator of the present invention; FIG. 4 is a schematic end view showing yet another example of the evaporator of the present invention; FIG. 4 is a schematic end view showing yet another example of the evaporator of the present invention; FIG. 4 is a schematic end view showing yet another example of the evaporator of the present invention; 1 is a schematic diagram of an evaporation system comprising an evaporator of the present invention; FIG. FIG. 4 is a schematic end view showing still another example of the evaporator of the present invention, the schematic end view of the evaporator having a condenser in the agitation vessel. FIG. 11 is a diagram schematically showing the configuration of an evaporation system using the evaporation apparatus of the present invention shown in FIG. 10; FIG. 4 is a schematic end view showing still another example of the evaporator of the present invention, the schematic end view of the evaporator having a condenser in the agitation vessel. 1 schematically illustrates an evaporation system comprising a conventional falling film evaporator; FIG. 14 is a diagram schematically showing a part of a cross section of an evaporator 800 that constitutes the evaporation system shown in FIG. 13. FIG. FIG. 15 is a diagram schematically showing a cross section in the AA direction of the conventional evaporator shown in FIG. 14;

The evaporator of the present invention will now be described with reference to the accompanying drawings.

FIG. 1 is a schematic end view showing an example of the evaporator of the present invention. Evaporator 100A of FIG. and a liquid dispersion part 120 for flowing down the raw material liquid.

The stirring tank 110 is a sealable tank having a volatile component outlet 113 and a concentrated liquid outlet 115, and is a tank capable of containing and stirring a liquid such as an aqueous solution or slurry. In FIG. 1, the volatile component outlet 113 is provided above the stirring vessel 110, and the volatile components generated by evaporation of the constituent components of the raw material liquid described below can be discharged to the outside through the outlet 113. FIG. On the other hand, in FIG. 1, the concentrated liquid outlet 115 is provided at the bottom of the stirring tank 110, preferably at the center of the bottom. can be discharged to

The size (capacity) of the stirring tank 110 is not necessarily limited because it can be appropriately set according to the use of the evaporator 100A (the type of raw material liquid to be supplied), the processing amount of the raw material liquid, etc., but for example, 0.1 liters to 100,000 liters. The material that constitutes the stirring tank 110 is not particularly limited. It is preferably composed of a metal such as titanium, hastelloy or copper. The inner wall of the stirring tank 110 may be provided with a coating known in the art, such as Teflon (registered trademark), glass lining, or rubber lining, in order to enhance chemical resistance.

The stirring tank 110 is provided with a jacket 112 for heating the inner wall 111 . The jacket 112 is arranged, for example, along the inner wall 111 so as to cover the entire outer circumference of the side surface of the stirring vessel 110 . Alternatively, the jacket 112 may cover from the bottom of the stirring vessel 110 to the side periphery of the inner wall 111 . The shape and type of jacket 112 are not particularly limited as long as inner wall 111 can be heated to a temperature at which the raw material liquid applied to inner wall 111 is evaporated. Jacket 112 includes, for example, those designed to allow the introduction of steam or heat transfer medium. Such a jacket may also be used in combination with a heat source such as a cable heater.

In the evaporator 100A shown in FIG. 1, the stirring tank 110 also includes a storage section 117 for temporarily storing the raw material liquid flowing down from the inner wall 111. As shown in FIG. In the present invention, the storage part is composed of a doughnut-shaped area that can be formed by enclosing the bottom and the inner wall of the stirring vessel. In one embodiment, as shown in FIG. 1, the reservoir 117 is an area that can be formed by being surrounded by the bottom of the stirring vessel 110, the inner wall 111, and the partition wall 118, that is, part of the bottom of the stirring vessel 110 and It is an area surrounded by a part of the inner wall 111 and the partition wall portion 118 . Reservoir 117 can temporarily store the raw material liquid up to the volume until the raw material liquid overflows from partition wall 118 (the volume up to the height indicated by reference number 129 in FIG. 1). In the embodiment shown in FIG. 1, since the upper part of the reservoir 117 is open, when the liquid surface of the raw material flowing down from the inner wall 111 exceeds the height of the partition wall 118, it overflows, and the overflowed raw material becomes the concentrated liquid. , and can be discharged to the outside through the concentrated liquid outlet 115 . Thus, in the embodiment shown in FIG. 1, the partition 118 is provided around the concentrate outlet 115 provided at the bottom of the stirring tank 110 . In addition, in the present invention, the storage section does not necessarily have to have the partition wall section as described above. For example, the reservoir may consist of a region in FIG. 1 where partition wall 118 is removed and the bottom and inner walls of the agitation vessel may be enclosed. In such a case, a concentrated liquid outlet (e.g., corresponding to reference number 115 in FIG. 1) provided below the reservoir is provided with a separate valve for controlling discharge of the concentrated liquid. Thus, the concentrated liquid can be discharged to the outside from the reservoir through the concentrated liquid outlet.

In the evaporator 100A shown in FIG. 1, the upper part of the stirring vessel 110 may also have a structure that can be opened and closed, such as a lid or a maintenance hole.

Inside the stirring vessel 110 , a dispersion section 120 is provided for spraying the raw material liquid stored in the storage section 117 on the inner wall 111 of the stirring vessel 110 . The liquid dispersion part 120 is composed of a rotating shaft 121 and a channel member 123 attached to the rotating shaft 121 . The liquid dispersion unit 120 causes the raw material liquid contained in the storage unit 117 to flow from the bottom to the top of the stirring vessel 110 through the flow path 126 provided along the length direction of the channel member 123 by the rotation of the rotating shaft 121 . The raw material liquid thus pumped up from the reservoir 117 can be sprayed toward the inner wall 111 of the stirring tank 110 . As a result, the sprayed raw material liquid flows down the heated inner wall 110 again to form a wet surface on the inner wall 110, and at this time, evaporation of volatile components can be promoted.

The rotating shaft 121 is a shaft made of rigid metal such as iron, stainless steel, Hastelloy, or titanium, and has, for example, a cylindrical or columnar shape. The rotating shaft 121 is generally arranged vertically within the stirring tank 110 . The thickness of the rotating shaft 121 is not necessarily limited, but is, for example, 8 mm to 200 mm. The length of the rotating shaft 121 varies depending on the size of the stirring tank 110 to be used, etc., and an appropriate length can be selected by those skilled in the art.

One end of the rotating shaft 121 is connected to rotating means such as a motor 140 at the top of the stirring vessel 110 . In FIG. 1 , the other end of the rotating shaft 121 is not connected to the bottom of the stirring vessel 110 and is arranged at a certain distance from the bottom of the stirring vessel 110 .

In the evaporator 100A shown in FIG. 1, two channel members 123 are symmetrically arranged around the rotating shaft 121 that constitutes the dispersion section 120 with the rotating shaft 121 interposed therebetween. Two channel members 123 are fixed to the rotating shaft 121 by means of fixtures 122 oriented in a direction perpendicular to the rotating shaft 121 . 1, two channel members 123 are attached to the fixture 122 so as to be inclined at _a predetermined angle (also referred to as an attachment inclination angle) .theta.1 about the rotary shaft 121. As shown in FIG. Here, the “attachment inclination angle θ ₁ ” in this specification means the angle formed by the intersection of a straight line parallel to the axial direction of the rotating shaft 121 and a straight line parallel to the axial direction of the channel member 123. Say something sharp. In the present invention, the channel member 123 is attached to the fixture 122 at an angle such that the upper end of both ends of the channel member 123 is closer to the inner wall 111 than the lower end. . The mounting inclination angle θ1 is, for example, _1.5 ° to 60°. Furthermore, the channel member 123 is arranged in the agitation vessel 110 at a position where one end (that is, the lower end) thereof is inserted into the reservoir 117 .

In FIG. 1, the two channel members 123 are shown in a shape (V shape) extending substantially linearly from their lower ends to their upper ends, but the present invention is not limited to such a shape. For example, the two channel members each have a bent shape that draws a gentle curve from the lower end to the upper end (for example, a shape in which two opposing channel members together form a part of an inverted parabola). may have

In the evaporator of the present invention, the rotating shaft may for example be fitted with a plurality (ie one or more) of channel members, preferably 2 to 8, more preferably 2 to 6 channel members. In the present invention, it is preferable that these channel members are mounted at substantially equal angles around the rotation axis.

FIG. 2 is a diagram schematically showing an example of a channel member that can be used in the liquid dispersion section that constitutes the evaporator of the present invention.

As shown in FIG. 2, in the channel member 123, the upper portion has a so-called half-pipe shape such as a semi-cylindrical shape, a half-square tube shape, or a V-shape, and the lower portion has a half-pipe shape. It is configured to have a form in which the parts are spread out. A central portion between the upper portion and the lower portion is configured such that a portion of the wall surface forming the harp pipe on the side where the portion of the half pipe is expanded in the lower portion expands. More specifically, the channel member 123 has a raw material liquid introduction portion 124 a that draws up the raw material liquid in the reservoir by rotation and introduces it into the flow channel 126 , and the raw material liquid introduced from the raw material liquid introduction portion 124 a into the flow channel 126 . It consists of a channel-forming portion 124b that flows upward through the . Further, in the embodiment shown in FIG. 2, in the central portion of the channel member 123, a channel expansion portion 127 is formed by widening a part of the region forming the edge of the channel on the side where the raw material introduction portion 124a is provided. is provided.

3 is a bottom view of the channel member attached to the fixture shown in FIG. 2; FIG.

In the evaporator of the present invention, the bottom of the channel member 123 (that is, the end on the bottom surface side) forms a rotational trajectory by rotating the rotating shaft in the direction indicated by the arrow. Here, the point on the bottom of the channel ₁₂₃ farthest from the axis O1 of the rotation shaft (hereinafter referred to as base point K) is the outermost circumference of the rotation trajectory of the channel member 123 as indicated by reference _number C1 in FIG. draw. Therefore, the base point K is arranged on the outermost circumference C ₁ of the rotational locus of the channel member 123 . In FIG. 3, the raw material introduction portion 124a and the flow path forming portion 124b that constitute the channel member 123 are divided through the base point K. As shown in FIG.

In the present invention, the raw material introduction portion 124a is designed to extend from the base point K to the raw material introduction edge portion H located at the tip in the traveling direction of the rotation of the rotating shaft. Further, in the widened shape of the raw material introduction portion 124a, the imaginary straight line LH including the raw material introduction edge _H and the base _point K is tangent to the outermost circumference C1 of the rotation trajectory of the channel member 123 at the base point _K. It is designed to intersect at an intersecting angle _θK within a predetermined range. In this specification, "the intersection of the virtual straight line _LH and the tangent line _LK " includes the case where the intersection angle _θK is 0°, that is, the case where the virtual straight line _LH and the tangent line _LK overlap. .

In the present invention, such a crossing angle θ _K is an acute angle, and the absolute value of the crossing angle θ _K is 0° to 10°, preferably 0° to 8°, more preferably 0° to 8°, based on the tangent line L _K of the outermost circumference It is within the range of 0° to 5°. Further, in the present invention, with respect to the traveling direction of the channel member ₁₂₃ , the raw material liquid introduction edge H is positioned inside the tangent line _LK (direction approaching the axis _O1 ) or outside the tangent line LK (axis O direction away from ₁ ). However, in order to prevent the material liquid introduction portion 124a from coming into contact with the excess material liquid through the rotation of the channel member 123, which becomes a resistance and hinders the rotation of the channel member 123 itself, the movement of the channel member 123 is With respect to the direction, the raw material liquid introduction edge H is preferably designed so as to be oriented toward the inner _side of the tangent line _LK (the direction toward the axis O1).

Furthermore, in the evaporator of the present invention, in addition to the above, the raw material introduction portion 124a of the channel member 123 is substantially parallel to the inner wall 111 of the stirring vessel 110 in the horizontal direction of the bottom portion (bottom side end portion) of the channel member 123. (for example, curved to match the shape of the inner wall 111).

The size of the channel member 123 is not particularly limited, and can be appropriately selected by those skilled in the art according to the size of the inner wall 111 of the stirring tank 110 . The channel member 123 is made of, for example, metals such as iron, stainless steel, Hastelloy, titanium, and combinations thereof. Such a channel member 123 may be provided with a coating known in the art, such as Teflon (registered trademark), glass lining, or rubber lining, in order to enhance chemical resistance.

As described above, in the present invention, the bottom portion (end portion on the bottom side) of the channel member inserted into the storage portion of the stirring tank has the above relationship in the horizontal direction, so that the dispersion portion is , the raw material liquid temporarily stored in the storage part can be caused to flow from the bottom to the top of the stirring tank through the upward movement of the chamber member with less torque.

More specifically, if the raw material introduction portion is curved such that the intersection angle _θK exceeds the range of the intersection angle θK and the intersection angle _θK itself becomes a negative angle (for example, the raw material introduction portion and In the case where the flow path forming portion has a semicircular shape in the horizontal direction), the raw material liquid introduction portion easily comes into contact with the raw material liquid. will receive more resistance from Therefore, when the channel member is rotated at a predetermined number of rotations, the volume of the raw material liquid introduced into the flow path forming portion is not always sufficient, and the raw material liquid moves upward along the flow path of the channel member 123 . It is difficult to say that the volume of the raw material liquid to be used is sufficient. As a result, it can be seen that the channel member must be rotated at a higher rotational speed in order to scoop up a certain amount of raw material liquid from the reservoir. Further, if the raw material liquid introduction portion is curved so that the crossing angle θ _K exceeds the range of the crossing angle θ K and the crossing angle θ _K itself is a positive angle, the raw material liquid introducing portion contacts more raw material liquid. Therefore, the amount of raw material liquid is too large, and the raw material liquid may overflow from the middle of the channel member.

On the other hand, in the _evaporator of the _present invention, as shown in FIG. oriented at the same or slightly slanted angle within. Due to such a crossing angle _θK , even if the channel member 123 rotates, the raw material liquid introduction portion 124a itself receives almost no resistance due to the raw material liquid, and the raw material liquid flows into the flow path forming portion 124b due to the rotation of the channel member 123. It is introduced into and efficiently scooped up. Furthermore, the scooped-up raw material liquid is subjected to centrifugal force due to the rotation, and moves upward along the flow path of the channel member 123 . As a result, even if the channel member 123 is rotated at a small number of revolutions, the raw material liquid can be efficiently scooped up from the reservoir and caused to flow from the bottom to the top of the stirring vessel. When the raw material liquid flows from the bottom to the top of the stirring tank as the channel member 123 rotates, the raw material liquid may spread in the flow path 126 under the influence of the rotation. For this reason, the channel expansion part 127 dams up the raw material liquid spreading in the channel 126 so as to prevent a part of the raw material liquid from spilling out of the channel 126 along the rotation direction of the channel 126 . It plays a role in promoting the flow from the bottom to the top.

Thus, the evaporator of the present invention not only allows for lower operating costs due to fewer rotations of the channel member 123, but also allows for shorter evaporating operations compared to the prior art. to

4 is a diagram for explaining the structure of the intermediate portion of the channel member attached to the fixture shown in FIG. 2. FIG.

In the evaporator of the present invention, as the rotating shaft rotates in the direction indicated by the arrow, the intermediate portion of the channel member forms a rotational trajectory as shown in FIG. 4(a). Here, the point on the outer side of the flow path 127 of the channel member ₁₂₃ farthest from the axis O1 of the rotating _shaft in _FIG . The outermost circumference of the rotational locus of the channel member 123 is drawn. Therefore, the base point K ₂ is arranged on the outermost circumference C ₂ of the rotational locus of the channel member 123 . Further, in _FIG . 4A, the edge portion H2 of the flow path expansion portion 127 is provided so as to be positioned inside the outermost circumference _C2 of the rotation locus.

Next, referring to _FIG . 4(b), the channel expansion portion 127 is formed such that the edge _H2 of the channel expansion portion 127 and the imaginary straight line _LH2 including the base point K2 _are the rotation trajectories of the channel member at the base point K2. It is designed to intersect the tangent line _LK2 of the outermost circumference _C2 at an intersection angle _θK2 within a predetermined range.

In the present invention, the crossing angle θ _K2 is an acute angle, and the crossing angle θ _K2 is 0° to 30°, preferably 1° to 20°, more preferably ₂ ° to Within 15°. By setting the crossing angle _θK2 within such a range, the raw material liquid pumped up from the raw material liquid introducing portion through the rotation of the channel member 123 passes through the channel 126 at the intermediate portion of the channel member 123. Therefore, it is possible to further reduce the overflow from the channel expansion portion 127 .

In the present invention, the position on the channel member 123 where the flow path expansion portion 127 that satisfies the crossing angle θ _K2 is not necessarily limited. A position can be selected such that the

The liquid dispersion part 120 having the channel member 123 having the structure described above can be used by being attached to various types of evaporators in addition to the evaporator 100 shown in FIG. 1, for example. That is, the evaporator causes the raw material liquid temporarily stored in the reservoir in the agitation tank to flow from the bottom to the top of the agitation tank by rotation and to scatter the raw material liquid from above. Any device is included as long as the liquid can flow down to the heat-generating portion in the stirring vessel to evaporate. Here, the term “exothermic portion” as used herein includes, for example, the inner wall 111 of the stirred vessel 110 heated by the jacket 112 of FIG. 1; A heat source and a coil heater provided so that the raw material liquid dispersed from above in the stirring vessel comes into direct contact with the inside of the stirring vessel.

Referring to FIG. 1 again, in the evaporator 100A of the present invention, a barrier member (not shown) such as a baffle plate, a short shaft pin, or the like is provided on a part of the bottom and/or the inner wall 111 constituting the reservoir 117. may be provided. When the raw material liquid temporarily stored in the storage part 117 is pumped up by the channel member 123 through the rotation of the rotary shaft 121, a vortex is generated in the storage part 117 in the forward direction of the rotation of the rotary shaft 121. There is The swirl of the raw material liquid may reduce the efficiency of pumping up the raw material liquid by the channel member 123 . The barrier member comes into contact with the raw material liquid in the storage section 117 and plays a role of suppressing or preventing the generation of such a vortex. The shape and material of the barrier member are arbitrarily selected by those skilled in the art, and the barrier member prevents movement of the channel member 123 in a portion of the inner wall 111 constituting the reservoir 117 and/or the inner bottom surface of the reservoir 117. It can be installed in a position where there is no

Furthermore, a second rotating shaft 121 ′ is provided around the rotating shaft 121 above the stirring tank 110 shown in FIG. 1 . Further, a supply pipe 130 having a raw material supply port 131 is attached to the second rotating shaft 121′, and a raw material tank (not shown) attached to the outside of the stirring tank 110 supplies the raw material. is supplied to the inner wall 111 of the stirring vessel 110 through the rotation of the second rotating shaft 121', and the raw material liquid is allowed to flow down along the inner wall 111 to form a wetted surface. In addition, in the evaporator 100A shown in FIG. 1, the rotating shaft 121 and the second rotating shaft 121′ are, for example, independent of each other, and the rotating shaft 121 and the second rotating shaft 121′ rotate in the stirring vessel 110 at different rotational speeds. Alternatively, the rotating shaft 121 and the second rotating shaft 121' may be connected and rotated at the same rotational speed.

In the evaporator 100A of the present invention, the rotation speed of the rotating shaft 121 suitable for pumping up the liquid in the stirring tank 110 (that is, the rotation speed of the liquid dispersion unit 120) depends on the viscosity of the liquid, the size of the stirring tank 110, Since it varies depending on the remaining amount of liquid in the stirring tank 110, it is not necessarily limited, but it is, for example, 30 rpm to 500 rpm.

In the evaporator 100A shown in FIG. 1, the raw material liquid supplied from the raw material liquid supply port 131 flows down the inner wall 111 of the stirring vessel 110, and the heat applied to the inner wall 111 by the jacket 112 at that time causes the volatile components to be removed. It evaporates and is discharged from the volatile component outlet 113 . On the other hand, the components of the raw material liquid that have not volatilized flow down the inner wall 111 and are stored in the reservoir 117 .

Further, in the present invention, the dispersion part 120 is rotated by a rotating means such as a motor 140, and the centrifugal force generated by the rotation is used to spread the raw material liquid stored in the storage part 117 of the stirring tank 110 to the lower end of the channel member 123. , and the raw material liquid is sprayed from the upper end side of the channel member 123 toward the inner wall 111 of the stirring tank 110 through the flow path 126 of the channel member 123 . The sprayed raw material liquid collides with the inner wall 111 of the stirring tank 110 and flows down the inner wall 111 again. At that time, the heat applied to the inner wall 111 by the jacket 112 evaporates the volatile component of the dispersed raw material liquid and moves to the volatile component outlet 113 . On the other hand, most of the raw material liquid flowing down the inner wall 111 is again stored in the reservoir 117 .

Thus, in the present invention, evaporation of volatile components when flowing down the inner wall 111, storage of the remaining components in the reservoir 117, and movement of the raw material liquid from the reservoir 117 to the inner wall 111 by the liquid dispersion part 120 , and from the liquid dispersion section 120 to the inner wall 111, the raw material liquid circulates between these members, and the raw material liquid is gradually concentrated by evaporation of the volatile components during circulation. On the other hand, a new raw material liquid flowing down from the raw material supply port 131 is also added, and the liquid level of the reservoir 117 gradually rises. After that, when the liquid surface of the raw material liquid stored in the storage section 117 exceeds the partition wall section 118, the raw material liquid stored in the storage section 117 overflows and is discharged to the outside from the concentrated liquid outlet 115 as a concentrated liquid.

According to the evaporator of the present invention, when the operation is stopped, the raw material liquid can be circulated as long as the raw material liquid is stored in the stirring tank, and the circulation is continued until the temperature of the inner wall drops to a certain extent. This makes it possible to avoid seizing on the inner wall of the stirring vessel. In this respect, it is possible to reduce the amount of undesired raw material liquid used during cooling of the stirring vessel, compared to conventional evaporators that pass through the inner wall of the stirring vessel in a single "one-pass" flow. .

In the present invention, it is possible to reduce the amount of droplets generated by the raw material liquid colliding with the inner wall at the upper end of the channel member in the liquid flow direction in the agitating tank. Here, in this specification, "to reduce the amount of droplets generated by the raw material liquid colliding with the inner wall in the stirring tank" means that when the raw material liquid pumped up from the channel member is sprayed on the inner wall of the stirring tank, In addition, the raw material liquid collides with the inner wall and suppresses the generation of splashes itself, reducing the substantial amount of splashes that diffuse into the stirring vessel, and when spraying the raw material liquid on the inner wall of the stirring vessel. Collecting droplets generated by collision before diffusing into the agitation vessel to reduce the substantial amount of droplets diffusing into the agitation vessel. In the present invention, this can be achieved by providing a splash preventer at the upper end of the channel member in the flow direction of the raw material liquid.

FIG. 5 is a schematic end view showing another example of the evaporator of the present invention.

In the evaporator 100B shown in FIG. 5, the configurations denoted by the same reference numerals as in the previous drawings are the same as those shown in the drawings.

The evaporator 100B of the present invention shown in FIG. 5 includes a mist separator 142 as a splash prevention device extending from the tip of the channel member 123 in the liquid flow direction. The mist separator 142 can spray the raw material liquid pumped from the lower end to the upper end of the channel member 123 through the flow path 126 of the channel member 123 toward the inner wall 111 of the stirring tank 110 through the tip. Here, in the embodiment shown in FIG. 5, the mist separator 142 is bent at the joint portion 125 from the axial direction of the channel member 123 (for example, in a direction substantially parallel to the inner wall 111), thereby is discharged from the tip of the mist separator 142 in a direction substantially parallel to the inner wall 111 (that is, above the stirring vessel 110). This ejection is performed by weakening the momentum of the liquid pumped up from the channel member 123 after passing through the joint portion 125 . As a result, the discharged raw material liquid does not jump upward from the stirring vessel 110, and the raw material liquid can be gently supplied from the tip of the mist separator 142 toward the inner wall 111 side. As a result, violent collision of the raw material liquid against the inner wall 111 is suppressed, and the amount of droplets generated by bouncing off the inner wall 111 can be reduced.

In the present embodiment, the term “a direction substantially parallel to the inner wall 111” refers not only to the direction in which the axis forming the channel 126 is parallel to the plane forming the inner wall 111, but also to the direction in which the inner wall 111 is parallel. It also includes the case where it is inclined, for example, within the range of -5° to +5°, preferably within the range of -3° to +3° with respect to the constituting plane.

Furthermore, it is preferable that the mist separator 142 and the inner wall 111 have an appropriate distance so as not to come into contact with each other. The closest distance between the mist separator 142 and the inner wall 111 is, for example, 5 mm to 200 mm. If the distance between the adjacent portions is less than 5 mm, the leading end of the mist separator 142 may come into contact with the inner wall 111 and damage the inner wall 111 and the mist separator 142 if the rotating shaft is slightly distorted during rotation. There is

Although FIG. 5 illustrates an example in which the mist separator 142 is bent with respect to the channel member 123 at the joint portion 125, the present invention is not limited to such a form. Instead of the bending, it may be curved with an arbitrary curvature around the joining portion.

In the present invention, the length of the mist separator 142 (the length from the joint 125 to the tip) depends on the rotational speed of the rotary shaft 121; the mounting inclination angle θ ₁ , length and width of the channel member 123; Viscosity; Although it is not necessarily limited because it varies depending on various conditions such as viscosity, it is, for example, 10 mm to 200 mm. Mist separator 142 may be one well known in the art.

FIG. 6 is a schematic end view showing still another example of the evaporator of the present invention.

In the evaporator 100C shown in FIG. 6, the configurations denoted by the same reference numerals as in the previous drawings are the same as those shown in the drawings.

In the evaporator 100C of the present invention shown in FIG. 6, the splash prevention tool includes a member for collecting splashes generated by colliding with the inner wall, and specifically includes a plate member 146 described below.

In FIG. 6, a plate member 146 is provided behind the channel member 123 along the channel member 123 in the vicinity of the upper end of the flow path 126 in the channel member 123 with respect to the direction of rotation of the channel member 123 . . The plate-like member 146 shown in FIG. 6 has a pentagon shape with one vertex of a rectangle cut off, and extends from behind the upper end of the channel member 123 to the vicinity of the rotation shaft 121 in the radial direction of the rotation shaft 121 . extends to

In the present invention, the size and thickness of plate-like member 146 are not particularly limited, and it is preferable that the plate-like member 146 be made of a material having a rigidity that can withstand the rotation of rotating shaft 121 . Examples of materials that make up the plate member 146 include metals such as iron, stainless steel, Hastelloy, titanium, and combinations thereof.

FIG. 7 is a schematic end view showing still another example of the evaporator of the present invention.

In the evaporator 100D shown in FIG. 7, the configurations denoted by the same reference numerals as in the above drawings are the same as those shown in the drawings.

The evaporator 100D shown in FIG. 7 includes three layers of dispersion parts 120c, 120d, and 120e in the vertical direction in the stirring tank 110. As shown in FIG. Furthermore, in the evaporator 100D, in addition to the reservoir 117 provided at the bottom of the stirring tank 110, a second reservoir 117d and a third reservoir 117e extending from the middle of the inner wall 111 are doughnut-shaped like the reservoir 117. is provided so as to constitute an area of The second storage part 117d and the third storage part 117e can also store the raw material liquid that has flowed down from the inner wall 111 of the stirring tank 110, and since both of them are open at the top, the liquid surface of the stored raw material liquid is When it rises and exceeds the partition walls 118d and 118e, the raw material liquid overflows and is stored in another storage section (the storage section 117 or the second storage section 117d) positioned below. The partition 118, the second partition 118d, and the third partition 118e extend downward from above the stirring vessel 110 (that is, in FIG. 7, the third partition 118e, the second partition 118d, and the partition 118 sequentially) is provided at a position such that it gradually approaches the concentrated liquid outlet 115 provided substantially in the center of the stirring vessel 110 .

Here, a pair of first channel members 123c are provided so as to be axially symmetrical about the rotating shaft 121 on the fixture 122c provided at the bottom of the rotating shaft 121. As shown in FIG. Also, the lower end of the first channel member 123 c extends to a position where it can be inserted into the raw material liquid stored in the reservoir 117 . A pair of second channel members 123d are provided on a mounting fixture 122d provided in the middle of the rotating shaft 121 so as to be axially symmetrical about the rotating shaft 121. As shown in FIG. Also, the lower end of the second channel member 123d extends to a position where it can be inserted into the raw material liquid stored in the second reservoir 117d. A pair of third channel members 123e are provided on a fixture 122e provided at the top of the rotating shaft 121 so as to be axially symmetrical about the rotating shaft 121. As shown in FIG. Also, the lower end of the third channel member 123e extends to a position where it can be inserted into the raw material liquid stored in the third reservoir 117e. The first channel member 123c, the second channel member 123d, and the third channel member 123e are configured similarly to the channel member 123 shown in FIG.

In the evaporator 100D shown in FIG. 7, the raw material liquid discharged from the raw material liquid supply port 131 of the supply pipe 130 first flows down the inner wall 111 of the stirring vessel 110 while forming a wet surface, and flows into the third reservoir 117e. be accommodated. Some of the volatile components contained in the raw material liquid evaporate as it flows down, and are discharged to the outside from the volatile component outlet 113 .

Further, by rotating the rotating shaft 121, the raw material liquid stored in the third reservoir 117e is pumped up from the lower end to the upper end of the third channel member 123e through the flow path 126e of the third channel member 123e. The liquid is dispersed and flows down to the inner wall 111 from the upper end of the channel member 123e. Volatile components contained in the raw material liquid evaporate as it flows down, and are discharged to the outside from the volatile component outlet 113 . The remaining raw material liquid containing other components is again stored in the third reservoir 117e, and is repeatedly pumped up by the third channel member 123e.

After that, when the liquid level of the third storage portion 117e rises and exceeds the third partition wall portion 118e, the raw material liquid overflows and is stored in the second storage portion 117d located in the lower stage.

The raw material liquid stored in the second reservoir 117d is pumped up from the lower end to the upper end of the second channel member 123d through the flow path 126d of the second channel member 123d by the rotation of the rotating shaft 121. From the upper end, it is sprayed on the inner wall 111 and flows down. Volatile components contained in the raw material liquid evaporate as it flows down, and are discharged to the outside from the volatile component outlet 113 . The remaining raw material liquid containing other components is again stored in the second reservoir 117d, and is repeatedly pumped up by the second channel member 123d.

After that, when the liquid level of the second storage section 117d rises and exceeds the second partition wall section 118d, the raw material liquid overflows and is stored in the storage section 117 positioned at the bottom.

The raw material liquid stored in the reservoir 117 is pumped up from the lower end to the upper end of the first channel member 123c through the flow path 126c of the first channel member 123c by the rotation of the rotating shaft 121, From the upper end, it is sprayed on the inner wall 111 and flows down. Volatile components contained in the raw material liquid evaporate as it flows down, and are discharged to the outside from the volatile component outlet 113 . The remaining raw material liquid containing other components is again stored in the reservoir 117 and is repeatedly pumped up by the first channel member 123c.

After that, when the liquid level of the storage section 117 rises and exceeds the partition wall section 118 , the raw material liquid overflows and is discharged to the outside through the concentrated liquid outlet 115 as a concentrated liquid.

Although the embodiment shown in FIG. 7 describes an evaporator device 100D with three layers of channel members, the invention is not so limited. For example, one composed of two layers of channel members (for example, the evaporator shown in FIG. 7 from which the fitting 122e, the third channel member 120e, the third reservoir 117e, and the third partition 118e are removed), Alternatively, four or more layers of channel members may be provided. Further, in the evaporator shown in FIG. 7, the second channel member and the third channel member are independently arranged with respect to the axis of rotation, for example a plurality (ie one or more), preferably two to eight channels. One, more preferably two to six, may be installed. In the present invention, it is preferable that the second channel member and the third channel member are independently mounted at approximately equal angles around the rotation axis.

In the evaporator 100D shown in FIG. 7, since the reservoir 117, the second reservoir 117d, and the third reservoir 117e contain raw material liquids with different concentrations of volatile components, concentration is performed using one reservoir rather than using one reservoir. Evaporation efficiency can be improved.

FIG. 8 is a schematic end view showing still another example of the evaporator of the present invention.

In the evaporator 200A shown in FIG. 8, the configurations denoted by the same reference numerals as in the previous drawings are the same as those shown in the drawings.

An evaporator 200A shown in FIG. 8 is provided above a stirring tank 210 in communication with a raw material tank (not shown) in which a raw material liquid supply port 148 is provided outside. Furthermore, the evaporator 200A is provided with a stirring tank 210 whose diameter decreases from the top to the bottom. Furthermore, a jacket 212 is provided on the side surface of the stirring vessel 210 along such a reduced diameter shape.

The raw material liquid supplied from the raw material liquid supply port 148 flows down along the inner wall 211 of the stirring tank 210 to the lower storage section 117 , during which the volatile components are evaporated by the heat from the jacket 212 , and the volatile component outlet 113 is discharged. It is discharged to the outside through On the other hand, the raw material liquid containing other components is stored in the reservoir 117 , moves upward again from the bottom of the channel member 123 through the flow path 126 of the channel member 123 due to the rotation of the rotating shaft 121 , and is sprayed on the inner wall 211 . . As a result, the evaporation of the volatile components contained in the raw material liquid is repeated.

On the other hand, when the liquid level of the storage section 117 rises and exceeds the partition wall section 118 , the raw material liquid overflows and is discharged to the outside from the concentrated liquid outlet 115 as a concentrated liquid.

Here, in the evaporator 200A shown in FIG. 8, for example, compared to the evaporator shown in FIG. Such an inclination increases the passage distance of the raw material liquid flowing down the inner wall 211, so that the volatile components can be evaporated more effectively. In particular, the evaporator 200A shown in FIG. 8 can be effectively used, for example, even when using a raw material liquid with relatively low viscosity.

Evaporators such as those shown in FIGS. 1 and 5 to 8 are also called thin film evaporators and can be incorporated and used in place of evaporators in conventional evaporation systems.

FIG. 9 is a diagram schematically showing an evaporation system provided with the evaporation device of the present invention.

The evaporation system 300 of the present invention includes a raw material tank 910 containing a raw material liquid, an evaporator 100 of the present invention (eg, the evaporator shown in FIG. 1 or FIGS. 5 to 8), a vacuum pump 920, and a condenser. 930.

By driving the pump 920 , the raw material liquid passes through the pipe 904 from the raw material tank 910 , is once preheated by the preheater 906 , and is fed to the evaporator 100 . Distillation apparatus 100 is heated by a jacket through which steam (STM) is separately passed through tube 905 . The volatile components evaporated in the evaporator 100 are supplied to the condenser 930 through the pipe 907 from the volatile component outlet of the evaporator 100 . Volatile components are then cooled in condenser 930 and then liquefied. Meanwhile, the concentrated liquid discharged from the concentrated liquid outlet of the evaporator 100 is discharged to the outside through the pipe 908 .

FIG. 10 is a schematic end view showing still another example of the evaporator of the present invention, which is a schematic end view of the evaporator equipped with a condenser in the stirring tank.

In the evaporator 400A shown in FIG. 10, the configurations denoted by the same reference numbers as those in the previous drawings are the same as those shown in the drawings.

In the evaporator 400A shown in FIG. 10, a fitting 122c provided on a rotating shaft 121 connected to a motor 140 is installed in a stirring tank 210 whose diameter is reduced from top to bottom (for example, an inverted conical shape) as a channel member. 123 is suspended from above. The channel member 123 is inclined so as to be substantially parallel to the slope of the inner wall 211 of the stirring tank 210, and the lower end extends to a position where the raw material liquid can be pumped up from the reservoir 117 containing the raw material liquid. Further, in the evaporator 400A of FIG. 10, the condenser 150 is arranged substantially in the center of the stirring tank 210. The condenser 150 includes a cooling main pipe 150a through which a cooling medium such as cooling water flows from the outside to the inside of the stirring tank 210, and a branch from the cooling main pipe 150a to allow the cooling medium to flow from the inside to the outside of the stirring tank 210. and cooling branch pipes 150b and 150c. Condenser 150, for example, is sized to be inserted from the bottom of the agitation vessel or placed through the top lid (not shown) of the agitation vessel, e.g., suspended prior to installation of channel member 123 and fitting 122c. is also possible. The condenser 150 has, for example, an inverted conical outer shape whose diameter decreases from top to bottom, and for example, cooling water is supplied from the outside of the stirring tank 210 by a method known to those skilled in the art (not shown). . Volatile components evaporated from the raw material liquid flowing down the inner wall 211 of the stirring vessel 210 are condensed on the condenser 150, liquefied again, and dropped toward the center of the bottom of the stirring vessel 210 as droplets.

Further, in the evaporator 400A, a volatile component outlet 113b is provided at the center of the bottom of the stirring tank 210 for discharging droplets dropped from the condenser 150 to the outside. A branch pipe 113a connected to a vacuum pump (not shown) is provided at a part of the volatile component outlet 113b, and droplets from the condenser 150 are discharged to the outside from the volatile component outlet 113b by pressure reduction from the vacuum pump. be.

Furthermore, in the evaporator 400A, the raw material liquid supplied from the raw material supply port 148 flows down the inner wall 211 of the stirring tank 210, and after the volatile components evaporate, the raw material liquid containing the remaining components is stored in the reservoir 117. be done. Next, the raw material liquid stored in storage part 117 moves upward again from the bottom of channel member 123 through flow path 126 of channel member 123 due to rotation of rotating shaft 121 , and is spread over inner wall 211 . As a result, the volatile components contained in the raw material liquid are repeatedly evaporated, and the raw material liquid is gradually concentrated and stored in the reservoir 117 .

In the evaporator 400A shown in FIG. 10, the raw material liquid in the storage section 117 can be discharged to the outside through the concentrated liquid outlet 115b provided at the bottom of the storage section 117 before exceeding the partition wall section 118. A valve (not shown) is provided outside the concentrated liquid outlet 115b, and by opening and closing the valve, the raw material liquid stored in the reservoir 117 can be discharged to the outside as a concentrated liquid.

The evaporator shown in FIG. 10 is also called a short-process distillation apparatus, and is capable of evaporating and condensing a raw material liquid under high vacuum.

FIG. 11 is a diagram schematically showing the configuration of an evaporation system using the evaporation apparatus of the present invention shown in FIG.

The evaporation system 500 of the present invention includes a raw material tank 910 containing a raw material liquid, an evaporator 400A of the present invention, and a vacuum pump 920 .

By driving the pump 902, the raw material liquid flows from the raw material tank 910 through the pipe 904, is once preheated by the preheater 906, and is fed to the evaporator 400A. Distillation apparatus 400A is heated by a jacket in which steam (STM) is separately passed through tube 905 . Volatile components evaporated in the evaporator 400A are condensed by a condenser in the device and discharged through a volatile component outlet by a vacuum pump 920 provided outside.

Thus, the evaporation system 500 of the present invention shown in FIG. 11 does not require a separate condenser in the system, and can be configured in a more space-saving manner.

FIG. 12 is a schematic end view showing still another example of the evaporator of the present invention, which is a schematic end view of the evaporator provided with a condenser in the stirring vessel.

In the evaporator 400B shown in FIG. 12, the configurations denoted by the same reference numerals as in the previous drawings are the same as those shown in the drawings.

The evaporator 400B shown in FIG. 12 is configured such that a channel member 123 is suspended from above by a fitting 122c provided on a rotating shaft 121 connected to a motor 140 in a stirring tank 110. As shown in FIG. The channel member 123 is inclined so as to be substantially parallel to the slope of the inner wall 111 of the stirring tank 110, and the lower end extends to a position where the raw material liquid can be pumped up from the reservoir 117 containing the raw material liquid. Furthermore, a mist separator 142 is provided at the upper end of the channel member 123 . Further, in the evaporator 400B of FIG. 12, the condenser 150 is arranged substantially in the center of the stirring tank 110. The condenser 150 has a main cooling pipe 150a through which a cooling medium such as cooling water flows from the outside to the inside of the stirring tank 110, and a branch from the main cooling pipe 150a to allow the cooling medium to flow from the inside to the outside of the stirring tank 110. and cooling branch pipes 150b and 150c. Condenser 150, for example, is sized to be inserted from the bottom of the agitation vessel or placed through the top lid (not shown) of the agitation vessel, e.g., suspended prior to installation of channel member 123 and fitting 122c. is also possible. The condenser 150 has, for example, an inverted conical outer shape whose diameter decreases from top to bottom, and cooling water is supplied from the outside of the stirring tank 110 by a method well known to those skilled in the art. Volatile components evaporated from the raw material liquid flowing down the inner wall 111 of the stirring vessel 110 are condensed on the condenser 150, liquefied again, and dropped toward the center of the bottom of the stirring vessel 110 as droplets.

Further, in the evaporator 400B, a volatile component outlet 113b is provided at the center of the bottom of the stirring tank 110 for discharging droplets dropped from the condenser 150 to the outside. A branch pipe 113a connected to a vacuum pump (not shown) is provided at a part of the volatile component outlet 113b, and droplets from the condenser 150 are discharged to the outside from the volatile component outlet 113b.

Furthermore, in the evaporator 400B, the raw material liquid supplied from the raw material supply port 148 flows down the inner wall 111 of the stirring tank 110, and after the volatile components evaporate, the raw material liquid containing the remaining components is stored in the reservoir 117. be done. The raw material liquid stored in storage part 117 moves upward again from the bottom of channel member 123 through flow path 126 of channel member 123 by rotation of rotating shaft 121 , and is sprayed onto inner wall 111 via mist separator 142 . As a result, the volatile components contained in the raw material liquid are repeatedly evaporated, and the raw material liquid is gradually concentrated and stored in the reservoir 117 .

In the embodiment shown in FIG. 12, the raw material liquid stored in the storage part 117 gradually increases, and when the liquid surface exceeds the partition wall part 118, the raw material liquid overflows and flows as a concentrated liquid through the concentrated liquid outlet 115c. It can be discharged to the outside. In the present invention, a second partition wall portion 119 is provided at the bottom portion of the stirring portion 110 further inside the partition wall portion 118 constituting the storage portion 117 (closer to the center of the stirring vessel 110). In the present invention, it is preferable that the upper end of the partition wall portion 118 is positioned below the upper end of the second partition wall portion 119 . This is to prevent the raw material liquid overflowing from the reservoir 117 beyond the partition wall 118 from entering the volatile component outlet 113b over the second partition wall 119 and mixing with droplets of the volatile component passing through the outlet. be.

The evaporator of the present invention can be used, for example, to purify and concentrate liquids containing impurities such as methyl esters, lactic acid, fish oil, fats and oils, glycerin; water, ethanol, methyl ethyl ketone contained in chemical products such as inks, paints and chemicals; (MEK), N-methylpyrrolidone (NMP), hexane, toluene, acetone, ethylene glycol, etc.; removal of volatile impurities from monomers and polymers, etc. used in the paint and resin manufacturing fields;

100A, 100B, 200A, 400A Evaporator 110, 210 Stirring tank 111, 211 Inner wall 112, 212 Jacket 113, 113b Volatile component outlet 115, 115b, 115c Concentrated liquid outlet 117 Storage section 118 Separation wall section 120 Dispersing section 121 Rotating shaft 122 , 122c, 122d, 122e Mounting tool 123, 123c, 123d, 123e Channel member 124a Raw material liquid introduction part 124b Flow path forming part 126 Flow path 127 Flow path expansion part 131, 148 Raw material liquid supply port 140 Motor 142 Mist separator 146 Plate shape Member 150 Condenser 300,500 Evaporation system

Claims (9)

a stirring vessel supplied with a raw material liquid and provided with a volatiles outlet and a concentrate outlet;
An evaporator, comprising: a liquid dispersion unit provided in the stirring tank and configured to flow down the raw material liquid to a heat-generating portion in the stirring tank,
(a) the stirring tank includes at least one reservoir surrounded by the bottom of the stirring tank and the inner wall and temporarily storing the flowing raw material liquid;
(b) the dispersion part is
Axis of rotation;
A liquid receiving portion including one end portion is arranged to be inserted into the storage portion, and the raw material liquid temporarily stored in the storage portion is supplied to the storage portion as the rotary shaft rotates. at least one channel member provided with a flow path through which fluid flows from the bottom to the top of the agitation tank; and a fitting that connects the rotating shaft and the channel member;
and (c) the channel member extends horizontally at the one end to:
a raw material introduction portion extending from a base point constituting the outermost periphery of the rotational trajectory of the channel member formed by rotation of the rotary shaft to a raw material introduction edge positioned at the tip in the traveling direction of the rotation; and an absolute value of an intersection angle _θK between an imaginary straight line including the raw material introduction edge and the base point and a tangent line to the outermost circumference at the base point is 0° to 10° with respect to the tangent line to the outermost circumference. , raw material liquid introduction part ;
a channel-forming portion extending from the base point of the outermost circumference to a channel-forming edge positioned opposite to the direction of travel by the rotation; and
a flow channel expansion portion disposed at the flow channel formation edge on the side where the raw material introduction portion is provided, damming up the raw material solution spreading in the flow channel to promote an upward flow from below;
An evaporator, consisting of 2. The evaporator according to claim 1 , wherein said heat-generating portion of said agitated vessel is an inner wall of said agitated vessel, and said inner wall is heated by a jacket provided around said agitated vessel. 3. The material introduction portion of the channel member according to claim 1 or 2 , wherein said one end portion of said raw material introduction portion is spread toward said rotating shaft with respect to the traveling direction of rotation of said rotating shaft in said horizontal direction. evaporator. 4. The evaporator according to claim 2 or 3 , wherein said raw material introduction portion of said channel member is designed to be substantially parallel to said inner wall of said stirring vessel in said horizontal direction of said one end. 5. The evaporator according to any one of claims 1 to 4 , wherein the concentrate outlet is provided at the bottom of the stirring vessel. The volatile component outlet is provided at the bottom of the stirring vessel, a condenser is provided in the center of the stirring vessel, and the volatile components evaporated from the raw material liquid are condensed in the condenser, and the volatile component outlet is 6. An evaporator as claimed in any one of claims 2 to 5 , wherein the evaporator is discharged via the . a raw material tank containing the raw material liquid;
6. The evaporator according to any one of claims 2 to 5 , which processes the raw material liquid supplied from the raw material tank;
a condenser for condensing the volatiles discharged from the volatiles outlet of the evaporator;
an evaporation system. a raw material tank containing the raw material liquid;
7. The evaporator according to claim 6 , which processes the raw material liquid supplied from the raw material tank;
an evaporation system. The raw material liquid temporarily stored in the reservoir in the agitating tank is caused to flow from the bottom to the top of the agitating tank by rotation, and the raw material liquid is dispersed in the agitating tank from above. A liquid dispersion unit provided in an evaporator that flows down to a heat-generating part and evaporates,
Axis of rotation;
A liquid receiving portion including one end portion is arranged to be inserted into the storage portion, and the raw material liquid temporarily stored in the storage portion is supplied to the storage portion as the rotary shaft rotates. at least one channel member provided with a flow path through which fluid flows from the bottom to the top of the agitation tank; and a fitting that connects the rotating shaft and the channel member;
and the channel member extends horizontally at the one end to:
a raw material introduction portion extending from a base point constituting the outermost periphery of the rotational trajectory of the channel member formed by rotation of the rotary shaft to a raw material introduction edge positioned at the tip in the traveling direction of the rotation; and an absolute value of an intersection angle _θK between an imaginary straight line including the raw material introduction edge and the base point and a tangent line to the outermost circumference at the base point is 0° to 10° with respect to the tangent line to the outermost circumference. , raw material liquid introduction part ;
a channel-forming portion extending from the base point of the outermost circumference to a channel-forming edge positioned opposite to the direction of travel by the rotation; and
a flow channel expansion portion disposed at the flow channel formation edge on the side where the raw material introduction portion is provided, damming up the raw material solution spreading in the flow channel to promote an upward flow from below;
A dispersion section, which consists of:

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