KR20130040273A

KR20130040273A - Absorbent for purifying air, filter comprising the absorbent and method for preparing the filter

Info

Publication number: KR20130040273A
Application number: KR1020110104912A
Authority: KR
Inventors: 이경미; 문종천; 박찬정
Original assignee: 코웨이 주식회사
Priority date: 2011-10-14
Filing date: 2011-10-14
Publication date: 2013-04-24

Abstract

PURPOSE: An adsorbent, a deodorization filter, and a manufacturing method of the deodorization filter are provided to improve formaldehyde adsorption efficiency by allowing adsorptive removal to be performed by physical absorption and chemical absorption simultaneously. CONSTITUTION: A deodorization filter manufacturing method comprises following steps. Zeolite powder is mixed with precursor liquid of amine group-containing compound and ripened in order to introduce amine group to the surface of the zeolite particles. The zeolite power to which amine group has been introduced is made slurry, and the slurry is coated on the porous filter supporter to obtain the filter. [Reference numerals] (AA) Zeolite powder; (BB) Impregnating in a precursor solution; (CC) Washing; (DD) Filtering; (EE) Drying;

Description

Absorbent for Purifying Air, Filter Comprising the Absorbent and Method for Preparing the Filter}

The present invention relates to an adsorbent for adsorbing and removing formaldehyde contained in indoor air, a deodorizing filter including the adsorbent, and a method of manufacturing the deodorizing filter.

In the filter for removing malodorous compounds such as formaldehyde, in the past, non-polar activated carbon has been physically adsorbed and removed. However, in the case of adsorption and removal using such activated carbon, formaldehyde to be removed has polarity. Adsorption efficiency is extremely low, a method for improving the adsorption efficiency was required.

Thus, a method of removing formaldehyde using a zeolite containing a polar molecule has been proposed. When such a zeolite is used, the affinity with formaldehyde is high, and the chemical absorption of formaldehyde can improve the removal efficiency of odorous substances. The technique for removing formaldehyde using such a zeolite is disclosed in Korean Patent Application Laid-Open No. 2001-0012445.

The patent document discloses a deodorizing composition containing a deodorizing compound of a polyhydric phenol or a derivative thereof chemically reacting with a odor component in the presence of water, and an absorbent substance such as an H-type or Na-type zeolite. An air cleaning filter further comprising activated carbon as an adsorbent is described.

In one embodiment of the present invention, it provides a deodorizing filter comprising the adsorbent and the adsorbent to further enhance the adsorption effect by simultaneously inducing chemical adsorption together with physical adsorption of zeolite and formaldehyde.

Furthermore, in another embodiment of the present invention, a method of manufacturing the deodorizing filter is provided.

One aspect of the invention relates to a method for producing a deodorizing filter, the method is an embodiment, the step of introducing the amine group on the surface of the zeolite particles by aging by mixing the zeolite powder with a precursor solution of the amine group-containing compound and After slurrying the zeolite powder into which the amine group is introduced, coating the slurry on a porous filter support and drying to obtain a filter.

In one embodiment, the zeolite powder may be X type zeolite.

In another embodiment, the amine group-containing compound may be an alkanol amine having 2 to 6 carbon atoms, and the alkanol amine may be monoethanol amine, diethanol amine, triethanolamine, methyldiethanolamine, or a mixture thereof. have.

In another embodiment, the precursor solution of the zeolite powder and the amine group containing compound may have a ratio of 1:10 by weight.

Furthermore, the precursor solution of the amine group-containing compound may be present in an amount of 5 to 50% by weight of the amine group in the solution.

As another embodiment of the present invention, the aging may be impregnated with the zeolite powder in the precursor solution of the amine group-containing compound at a temperature range of 60-70 ℃ for 24 to 48 hours.

In one embodiment of the present invention, the slurry is (a) 100 parts by weight of the zeolite powder introduced with the amine group and polyvinyl alcohol of the kind bentonite, clay, organic alcohol based on 100 parts by weight of the component (a) ( 2 to 15 parts by weight of a binder selected from PVA) and dextrin, and water may include 40 to 60% by weight of the total weight of the zeolite powder and the binder in the slurry.

As another embodiment of the present invention, the obtained filter may further comprise the step of heat treatment for 1-4 hours at a temperature range of 200-600 ℃.

According to another aspect of the present invention, a zeolite adsorbent is provided, and according to one embodiment, the zeolite adsorbent may be impregnated with an amine group on the surface of the particle of the zeolite to simultaneously perform physical adsorption and chemical adsorption of odor.

In another embodiment, the zeolite may be an X type zeolite.

According to still another aspect of the present invention, a deodorizing filter is provided, and the deodorizing filter provides a deodorizing filter in which the zeolite adsorbent described above is coated on the surface of the porous filter support.

According to the embodiment of the present invention, the adsorption and removal of formaldehyde simultaneously with the physical adsorption by the zeolite, the chemical adsorption proceeds simultaneously, it is possible to significantly improve the adsorption efficiency of formaldehyde.

Various features of the present invention and the advantages and effects thereof may be understood in more detail with reference to the following specific embodiments.

1 is a view showing a schematic process diagram of a method for producing an adsorbent according to an embodiment of the present invention.
2 is a view showing a schematic process of a method for producing a deodorizing filter using an adsorbent according to an embodiment of the present invention.
3 is a graph showing a change in the specific surface area of the adsorbent according to the amount of amine impregnation in the adsorbent according to an embodiment of the present invention.
4 is a graph showing a change in carbon dioxide adsorption amount according to the amount of amine impregnation in the adsorption filter according to an embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is concretely demonstrated to an embodiment.

According to one aspect of the invention, there is provided a deodorizing filter comprising a zeolite adsorbent and a method for producing the deodorizing filter.

In one embodiment of the present invention, the deodorizing adsorbent is obtained by modifying the zeolite. The zeolite used here is a crystalline aluminosilicate having a solid three-dimensional structure, and is a three-dimensional inorganic polymer in which Si and Al are connected through four cross-linked oxygens, respectively. At this time, Al has a negative charge as it combines with four oxygens, and various cations exist in the zeolite to offset the negative charge.

Depending on the type of cations, the pores are blocked from opening, thereby blocking specific molecules in the adsorption process. The cation can also improve the adsorption selectivity for polar molecules by causing a high electric field in the cavity. In particular, since the X-type zeolite has more aluminum structure than the Y-type, it is possible to form a higher electric field therein, and thus is widely used as a polar gas adsorbent.

Adsorbent according to one embodiment of the present invention by introducing an amine group (NH ₂ ) to the X-type zeolite at the same time induces the physical adsorption of the zeolite itself and the chemical adsorption by the amine group adsorption as an adsorbent through an increase in the amount of adsorption Efficiency can be improved.

As such a compound containing an amine group used to introduce an amine group to the zeolite surface, it is an alkanol amine having 2 to 6 carbon atoms, for example, monoethanolamine (MEA), diethanolamine (DEA), Triethanolamine (TEA) or methyldiethanolamine (MDEA) may be used as a precursor, and these may be used alone or in combination.

The method of introducing an amine group to the zeolite surface may be performed by mixing and aging the zeolite powder in the amine group-containing compound solution. The amine group-containing compound solution is mixed so that the amine group can be sufficiently introduced into the zeolite powder. At this time, the mixing ratio is not particularly limited, but may be mixed, for example, in a weight ratio of zeolite powder to amine group-containing compound solution 1:12 to 3: 7, for example, 1:10 to 2: 8. At this time, the zeolite powder is preferably mixed with an amine group-containing compound solution having a temperature in the range of 60 to 70 ℃.

The amine group-containing compound solution is a mixture of an amine group-containing compound with water, and is preferably adjusted so that the concentration of the amine group-containing compound is 10-40% by weight. Using an amine group-containing compound solution having a temperature in this range can maximize the efficiency of chemical adsorption and physical adsorption of odorous substances by the introduction of amine groups, and at higher concentrations, the degree of occlusion of pores of zeolite adsorbent is greatly increased. Therefore, there is a problem that the specific surface area is excessively reduced.

And a step of aging the mixed solution thus obtained to sufficiently introduce the amine group onto the surface of the zeolite particles. The aging may be performed by leaving the amine-containing compound solution containing the zeolite powder for 24 to 48 hours. Thereby, an amine group can be introduce | transduced into the surface of a zeolite particle.

After the introduction of the amine group on the surface of the zeolite particles as described above, the zeolite powder into which the amine group is introduced may be recovered by vacuum filtration or the like, and washed with distilled water to remove residual impurities. Furthermore, if necessary, the drying step may be performed, and the drying may be performed at a temperature range of 80-150 ° C.

By passing through the above steps, the zeolite adsorbent having the amine group impregnated on the surface of the particle of the zeolite according to the embodiment of the present invention can be obtained.

According to one embodiment of the present invention, a deodorizing filter may be manufactured using the obtained zeolite adsorbent. To this end, first, the step of slurrying the obtained zeolite adsorbent. The slurrying can be obtained by mixing the obtained zeolite adsorbent with a binder and water.

The binder component can maintain the mechanical strength of the adsorbent on the surface of the filter, and can be appropriately selected to provide a large amount of pores after firing, and is not particularly limited in the present invention. Clay, organic alcohols such as polyvinyl alcohol (PVA), dextrin and the like. In the firing process, it is preferable to use an organic binder which can be removed after pore formation, and more preferably, dextrin. In this case, the binder may be included in the range of 2-15 parts by weight based on 100 parts by weight of the zeolite adsorbent powder in which the amine group is introduced.

Slurry is obtained by adding water to the mixture of the zeolite adsorbent and the binder. The water may be included so that the weight of the zeolite adsorbent and binder in the slurry is 40 to 60% by weight.

The deodorizing filter can be obtained by coating the obtained slurry on the surface of the porous filter support. In this embodiment, it does not specifically limit about the said porous filter support body, What can be used conventionally in the art can be selected and used. As the porous filter support, conventional fibrous filters, metallic filters, ceramic filters can be used.

The porous filter support may be coated by depositing the porous filter support on the prepared slurry. The coating can be carried out by, for example, depositing the porous filter support so that an adsorbent material can form a film inside the porous filter support by capillary action, and then slowly lifting it.

Prior to coating on the porous filter support, it is preferable to sonicate the prepared slurry so that the adsorbent particles can be homogeneously dispersed in the solution.

After drying at room temperature, the heat treatment is performed by maintaining for 1 to 4 hours at various temperature conditions in the range of 200 ~ 600 ℃. Basically, the heat treatment serves to form pores in the filter by removing organic substances, and improve the mechanical strength of the filter by improving the stability of the adsorbent particles.

A deodorizing filter can be manufactured by the above method. The deodorizing filter obtained according to one embodiment of the present invention partially modifies the structure of the pores of the zeolite solid particles used as the adsorbent to facilitate the flow of molecules to be adsorbed such as formaldehyde and carbon dioxide. In addition, by coating the prepared adsorbent powder on the porous filter support, it is possible to improve the adsorption efficiency of the odor component when applied to the air conditioning equipment and exhaust gas purification process, and further, it is possible to additionally collect the fine dust contained in the inlet gas. .

Hereinafter, the present invention will be described more specifically with reference to examples. The examples described below show examples of one embodiment of the present invention, and the present invention is not limited to the following examples.

Example

An amine group Preparation of Zeolite Adsorbents Introduced

As a type X zeolite powder, commercial zeolite 13X (specific surface area 412.5 m 2 / g) was prepared. 99% pure monoethanol amine was diluted with distilled water to prepare an aqueous amine solution of 10% (1.6M), 20% (3.2M), 30% (4.8M)) and 40% (6.4M). . The zeolite powder was mixed with the respective monoethanol amine aqueous solution having the amine content as described above at 60 ° C., and then left for 24 hours to introduce an amine group into the zeolite particles. At this time, the ratio of the monoethanol amine aqueous solution and zeolite was quantified and mixed by the weight ratio of 10: 1.

Thereafter, the adsorbent of the zeolite powder into which the amine group was introduced through vacuum filtration was separated, washed three times with distilled water to remove residual impurities, and dried at 120 ° C. to complete the zeolite adsorbent.

The specific surface area of the adsorbent according to the amine concentration in the aqueous amine solution was measured, and the results are shown in Table 1, which is shown in FIG. 3.

Amine aqueous solution concentration
(M concentration) Amine aqueous solution: zeolite
Weight ratio Specific surface area
(M < 2 > / g) Inventory 1 1.6 M 10: 1 385.2 Inventory 2 3.2 M 10: 1 372.6 Inventory 3 4.8 M 10: 1 346.9 Honorable 4 6.4 M 10: 1 325.1

As can be seen from Table 1 and FIG. 3, the specific surface area of the adsorbent decreases as the content of the amine introduced into the adsorbent increases. From these results, it is considered that the amine introduced into the zeolite particles blocks pores inside the zeolite.

Filter manufacturer

The zeolite adsorbent into which the prepared amine group was introduced was mixed with dextrin and distilled water, and ultrasonic waves were applied to uniformly disperse the adsorbent particles to prepare a slurry. In preparing the slurry, 100 parts by weight and 10 parts by weight of the adsorbent and dextrin were respectively mixed, and water was mixed in an amount of 50% by weight of the total slurry weight.

The porous filter support made of polypropylene was dipped in the slurry thus obtained for 30 minutes, and then gradually lifted up.

Thereafter, the filter was left to stand at room temperature for 18 hours, dried, and then heat treated at 500 ° C. for 2 hours to prepare a filter for deodorization.

Adsorption amount test of filter

In order to measure the carbon dioxide adsorption amount of the prepared adsorbent, the prepared deodorizing filter was attached to the fixed bed reactor and tested. The fluid flowing into the adsorption layer was configured to be upward flow, the flow rate of the test gas was controlled using MFC (Mass Flow Controller), the adsorption test was carried out using formaldehyde standard gas, and the inflow concentration of the incoming gas Was maintained at 3,000 ppm.

The adsorption amount of the manufactured filter was calculated by the following equation using a breakthrough curve for the adsorption reaction time (calculation of the adsorption amount using the results of the outlet concentration at the outlet of the adsorption reactor for the adsorption reaction time). The results are shown in Table 2 below and FIG. 4. As a reference example, the amount of adsorption when untreated zeolite powder to which no amine group was introduced was used was also evaluated.

Where q is the molar adsorption, Q is the gas flow into the reactor, W is the adsorbent mass, Ci and Co is the gas concentration at the front and rear of the adsorption reactor, and t _s is saturated The time until adsorption is shown.

Amine Impregnation
(weight%) Specific surface area
(M < 2 > / g) Adsorption amount
(mmol / g) Reference Example 0 (zeolite) 412.5 0.675 Inventory 1 10 385.2 1.078 Inventory 2 20 372.6 1.284 Inventory 3 30 346.9 1.364 Honorable 4 40 325.1 1.853

From the results according to Table 2 and FIG. 4, although the amount of amine introduced into the adsorbent increases as the introduced amine blocks pores inside the zeolite, resulting in a decrease in specific surface area of the adsorbent, as the amount of amine impregnation increases. It can be seen that the adsorption amount of the gas increases.

Judging from these results, it can be seen that the gas is mainly removed by chemical adsorption by amines rather than physical adsorption by pores.

As a result, this result is considered to show that the overall adsorption amount increases as the chemical adsorption by the amine groups introduced into the zeolite adsorbent is added to the physical adsorption by the pores of the zeolite adsorbent.

Claims

Introducing the amine group to the surface of the zeolite particles by aging the zeolite powder by mixing with the precursor solution of the amine group-containing compound; And
After slurrying the zeolite powder into which the amine group is introduced, coating the slurry on a porous filter support and drying to obtain a filter;
Deodorizing filter manufacturing method comprising a.

The method of claim 1, wherein the zeolite powder is an X-type zeolite.

The method of claim 1, wherein the amine group-containing compound is an alkanol amine having 2 to 6 carbon atoms.

The method of claim 3, wherein the alkanol amine is a monoethanol amine, diethanol amine, triethanolamine, methyldiethanolamine, or a mixture thereof.

The method of claim 1, wherein the precursor solution of the zeolite powder and the amine group-containing compound has a ratio of 0.5-3: 10 by weight.

The method according to claim 1, wherein the precursor solution of the amine group-containing compound has a content of 10 to 40% by weight of the amine group in the solution.

The method of claim 1, wherein the aging of the zeolite powder is impregnated in the precursor solution of the amine group-containing compound at a temperature range of 60-70 ° C. for 24 to 48 hours.

According to claim 1, wherein the slurry is a binder selected from bentonite, clay, polyvinyl alcohol and dextrin based on (a) 100 parts by weight of the zeolite powder introduced with the amine group, and 100 parts by weight of the component (a). 15 parts by weight and and water, wherein the water is 40 to 60% by weight of the total slurry weight deodorizing filter manufacturing method.

The method of claim 1, further comprising heat-treating the obtained filter at a temperature range of 200-600 ° C. for 1-4 hours.

A zeolite adsorbent in which an amine group is introduced to the surface of zeolite particles to simultaneously perform physical adsorption and chemical adsorption of formaldehyde.

10. The zeolite adsorbent of claim 9 wherein said zeolite is an X-type zeolite.

A deodorizing filter, wherein the zeolite adsorbent according to any one of claims 9 to 11 is coated on a porous filter support surface.