JP3029808B2 - Deodorizing filter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing filter device suitable for removing an odor mainly composed of an organic compound such as indoor tobacco odor and cooking odor.

[0002]

2. Description of the Related Art As a deodorant particularly suitable for removing odors mainly containing organic compounds such as indoor tobacco odor and cooking odor, Japanese Patent Application Laid-Open No. 7-155366 by the present applicant discloses an odor component. A deodorant in which a predetermined amount of a ruthenium catalyst containing ruthenium tetroxide is supported on a porous carrier to be adsorbed is disclosed. The ruthenium catalyst containing ruthenium tetroxide oxidizes and decomposes organic compounds among odor components adsorbed on the porous carrier to mainly generate carbon dioxide and moisture. The generated carbon dioxide and moisture are scattered, thereby restoring the adsorption capacity of the porous carrier, thereby greatly extending the useful life of the porous carrier before reaching the adsorption saturation. In particular, the ruthenium catalyst facilitates not only organic compounds which are easily oxidized and decomposed at a low boiling point, but also organic compounds which are usually hardly oxidized and decomposed such as tobacco odor components such as isoprene, ketones, lower organic acids and phenols. It can be oxidatively decomposed. This deodorant functions as an excellent deodorizing filter supported on a gas-permeable filter substrate.

[0003]

However, the present inventors have conducted various studies on the deodorizing action and mechanism of the above-mentioned conventional deodorant, and found that the above-mentioned catalytic activity not only includes ruthenium tetroxide but also generally ruthenium oxide. It has been found that the same can be exerted on a ruthenium catalyst. However, it has also been found that this ruthenium oxide catalyst does not exhibit its catalytic activity effectively depending on the conditions. As a result of further investigation, it was newly found that the ruthenium oxide catalyst, when a basic compound was contained in the odor, inhibited its catalytic activity, that is, the oxidative decomposition activity of organic compounds. Therefore, when the above-mentioned conventional deodorizer / deodorizing filter or the like is used for a long time to remove indoor odors including tobacco smoke containing a basic compound such as a nitrogen-containing compound as an odor component, a ruthenium catalyst containing ruthenium oxide can be used. The oxidative decomposition activity is lost, and the life as a deodorant is shortened.

Accordingly, an object of the present invention is to provide a deodorizing filter device in which the deodorizing effect does not decrease over a long period of time even in the presence of a basic compound while maintaining the advantages of the conventional deodorizing agent / filter. And

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to suppress the inhibitory effect of the basic compound on the above-mentioned conventional deodorizing agent. It has been found that it is effective to provide a second filter member for supporting the acidic compound on the upstream side of the filter to be ventilated, and the present invention has been completed.

That is, the present invention provides a first filter member comprising a first gas-permeable support for supporting an acidic compound which adsorbs and removes a basic compound, and an adsorbent for an odor component carrying a ruthenium catalyst containing ruthenium oxide. And a second filter member made of a second support for supporting the first porous carrier in such a manner that odor passes through the first filter member and then passes through the second filter member. A deodorizing filter device is provided.

When the acidic compound supported on the first air-permeable support is a solid acidic compound, it can be directly supported on the first filter member. This solid acidic compound can be selected from the group consisting of zeolites, acidic clay compounds, and acid form ion exchange resins.

When the acidic compound supported on the first air-permeable support is a liquid acidic compound, the acidic compound is supported on the first air-permeable support in a form adsorbed on the second porous carrier. Can be.

[0009]

According to the deodorizing filter device of the present invention, a first filter member comprising a first support for supporting an acidic compound which adsorbs and removes a basic compound, and an odor component adsorbing agent carrying a ruthenium catalyst containing ruthenium oxide. And a second filter member composed of a second support for supporting the first porous carrier. In the second filter member, a ruthenium catalyst containing ruthenium oxide having a strong oxidizing ability is supported on a first porous carrier that deodorizes odor components by physical adsorption. The odor component is adsorbed on the first porous carrier. Organic compounds among the adsorbed odor components migrate to the ruthenium catalyst and are oxidized by the ruthenium catalyst to mainly produce CO ₂ and H ₂ O.
Is decomposed into That is, since the organic compound among the odor components adsorbed by the first porous carrier is converted into a form that can be easily scattered, the adsorptive capacity of the first porous carrier is restored, and until the adsorption saturation is reached. The period is greatly extended. When the basic compound coexists in the odor, the basic compound is preferentially adsorbed and captured by the acidic compound supported by the first filter member installed on the upstream side of the ventilation of the second filter member. . That is, since the basic compound contained in the odor is adsorbed and removed by the first filter member in advance, the ruthenium catalyst in the first filter member is sufficiently protected from attack by the basic compound, and exhibits the excellent oxidative decomposition action. Demonstrate for a long time.

[0010]

Embodiments of the present invention will be described below.

As described above, the deodorizing filter device of the present invention comprises a first filter member comprising a first support for supporting an acidic compound which adsorbs and removes a basic compound, and a ruthenium catalyst containing ruthenium oxide. This is a combination of a second filter member composed of a second support for supporting the carried first odorous component-adsorbing first porous carrier.

The second filter member is provided with a gas-permeable support (second gas-permeable support), on which a predetermined ruthenium catalyst is carried and a first porous carrier having an odor-absorbing property (hereinafter simply referred to as a “porous support”). , A ruthenium catalyst-carrying deodorant). First supporting ruthenium catalyst
Is made of a material having the ability to physically adsorb odor components, such as activated carbon, γ-alumina, synthetic zeolite (molecular sieve) other than natural zeolite, montmorillonite, and activated clay.

Of these materials, activated carbon is about 1000 m
² / g of specific surface area. Among them, fibrous activated carbon and special powdered activated carbon as disclosed in US Pat. No. 4,082,694 have a specific surface area of 300 to 5000 m ^2.
/ G. The specific surface area of materials other than activated carbon is 1 for bone char
10m ² / g, alumina γ- is 150~340m ² /
g, synthetic zeolite is 500 to 700 m ² / g, the activated clay is 120 m ² / g. Therefore, the porous carrier has 1
Those having a specific surface area of 00 to 5000 m ² / g can be suitably used. Activated carbon has a relatively large specific surface area of about 1000 m ² / g, has a high adsorptivity, a pore size suitable for adsorbing gas molecules, and has a hydrophobic surface, while having an affinity for organic compounds. It is particularly preferable because of its high quality, constant quality and low cost. Fibrous activated carbon and special powdered activated carbon are more preferable because the specific surface area is 300 to 5000 m ² / g.

The ruthenium catalyst containing ruthenium oxide supported on the first porous carrier oxidizes and decomposes organic compounds among the odor components adsorbed on the first porous carrier having an odor component adsorbing property, and To produce CO ₂ and H ₂ O. Ruthenium oxide exerts an oxidizing effect on a wide range of organic compounds such as, for example, saturated hydrocarbons, olefins, diols, acetylenes, aromatic compounds, alcohols, ethers and organic sulfur compounds. In particular, hydrogen sulfide,
Oxidative decomposition not only of compounds with low boiling point and easily decomposed by oxidation such as mercaptans and aldehydes, but also organic compounds that are usually hard to be decomposed by oxidation such as isoprene, ketones, lower organic acids and phenols, which are components of tobacco smell Can be done. The carbon dioxide and water generated by the oxidative decomposition of the ruthenium catalyst are easily scattered, thereby restoring the adsorptive capacity of the first porous carrier, and thus the usable amount until the first porous carrier reaches the adsorption saturation. Extends lifespan significantly.

The ruthenium oxide is RuO to RuO.
₄ (RuO _x : x = 1 to 4) supported on the first porous carrier, which constitutes a catalytic active site. The organic compound adsorbed on ruthenium oxide, which is the active site (acid site) of the catalyst, can remarkably accelerate the decomposition at a relatively low temperature of about 60 ° C.

The ruthenium catalyst containing ruthenium oxide is
Converted to ruthenium, 1 to 1 of the weight of the first porous carrier
It is particularly preferred that it is supported at a rate of 0% by weight. If the amount is less than 1% by weight, the organic compound may not be sufficiently oxidatively decomposed. On the other hand, if the supported amount exceeds 10% by weight, the amount of the first porous carrier adsorbed is limited. Therefore, if the supported amount is more than this, the dispersibility of ruthenium deteriorates in the production method described later, and the activity decreases. May lead to

In order to carry the ruthenium catalyst on the first porous carrier, first, for example, after impregnating the first porous carrier with an aqueous solution of ruthenium trichloride hydrate (RuCl ₃ .3H ₂ O), Then, the water is evaporated to allow ruthenium trichloride to be supported on the porous carrier. Next, the supported porous carrier is heated to about 80 ° C. to oxidize ruthenium trichloride to ruthenium oxide. In this manner, a porous carrier supporting a ruthenium catalyst containing ruthenium oxide can be obtained. The generated ruthenium oxide is RuO to RuO ₄ (RuO
O _x ) is present on the first porous support in the form of X
It has been confirmed by linear photoelectron spectroscopy (XPS) and the like.

Further, in the present invention, a co-oxidizing agent may be further carried on the first porous carrier carrying the ruthenium catalyst. The co-oxidizing agent contains at least one selected from the group consisting of ferric chloride, cobaltous chloride, indium tertiary chloride, sodium chlorate, sodium bromate and sodium iodate. The co-oxidizing agent is preferably supported on the first porous carrier at a ratio of 1/10 to 1/5 mol per mol of ruthenium. By using the co-oxidizing agent together, the oxidizing ability by ruthenium oxide is further improved.

The air-permeable support supporting the first porous carrier supporting the ruthenium catalyst is not particularly limited as long as it has gas permeability and can support the deodorant supporting the ruthenium catalyst. Sheet-like supports, lattice-like or honeycomb-like supports can be preferably used.

The ruthenium catalyst-carrying deodorant can be supported on a gas-permeable support in various forms. For example, JP-B-59-19727, JP-A-53-64
No. 675, Japanese Utility Model Application Laid-Open No. 57-119724, etc., in a filter in which fine powdered activated carbon is mixed with paper at the paper making stage and formed into a honeycomb or single-layered cardboard laminate, the filter is replaced with fine powdered activated carbon. Thus, the ruthenium catalyst-supported deodorant of the present invention can be used. Further, in a deodorizing filter for an air conditioner disclosed in Japanese Patent Application Laid-Open No. 3-123625 comprising a grid-shaped filter base and gas adsorbent particles adhered to the filter base, fine powdery gas adsorbent particles are used. The ruthenium-supported deodorant of the present invention can be used.

Further, the present invention also relates to a deodorizing filter in which a deodorant is adhered to a net by various methods, as disclosed in JP-A-60-60433 and JP-A-52-56037. A ruthenium-supported deodorant can be used. Further, according to the methods disclosed in JP-A-57-48325 and JP-A-59-227704, activated carbon is mixed with an appropriate binder, extruded, formed into a honeycomb or monolith, and dried by heating. After the formed filter is formed, the activated carbon may carry a ruthenium catalyst containing ruthenium oxide as described above.

A simple and effective method for supporting the ruthenium catalyst-carrying deodorant on the second support is to immerse a grid-like or honeycomb-like filter substrate in an adhesive (for example, an acrylic emulsion adhesive). Then, after pulling up, the above-mentioned ruthenium catalyst-carrying deodorant is sprinkled on this.

As described above, when the ruthenium catalyst-supported deodorant is used for deodorizing an odor containing a basic compound as a component, the basic compound is strongly adsorbed on the ruthenium catalyst surface and the catalytic action is inhibited. Have been found by the present inventors. The basic compound preferentially adsorbs to the active site (acid site) of the ruthenium catalyst more than the first porous carrier, poisons the active site, and shortens the life as a deodorant. In order to suppress the poisoning effect of such a basic compound and prevent the life of the ruthenium catalyst-supporting deodorant from being shortened, the present invention provides a first support supporting an acidic compound that adsorbs and removes a basic compound. The two filter members are combined such that a first filter member made of is disposed upstream of the ventilation of the second filter member supporting the ruthenium catalyst-carrying deodorant.

The acidic compound supported on the first support includes a solid acidic compound and a liquid acidic compound.
Here, the solid acidic compound refers to an acidic compound that is solid at a use environment temperature (−20 ° C. to 100 ° C.) of the deodorizing filter device of the present invention, and a liquid acidic compound refers to the use environment of the deodorizing filter device of the present invention. An acidic compound that is liquid at temperature. A solid acidic compound is preferable to a liquid acidic compound in that a basic compound can be captured for a long period of time.

Preferred examples of the solid acidic compound include zeolites (H ⁺ -mordenite, H ⁺ -zeolite Y, etc.) and acidic clay compounds (acid clay, activated clay, acid-treated activated clay (for example, manufactured by Mizusawa Chemical Co., Ltd.) Galeonite 13
6), sepiolite (for example, Aidplus G manufactured by Mizusawa Chemical Co., Ltd.), and acid-form ion-exchange resin (polystyrenesulfonic acid-based resin (for example, Amberlst (Amberl manufactured by Organo)
yst) 15), H-type acrylic resin (for example, Amberlite IRC-76 manufactured by Organo Corporation). The solid acidic compounds exemplified here are also hydrophobic. Since water does not adsorb to the hydrophobic acidic compound, there is little decrease in the acid strength, which is advantageous for the adsorption and removal of the basic compound. Activated alumina, Na ⁺ -montmorillonite and the like can also be used as the solid acidic compound.

In order for the solid acidic compound to be supported on the first support, the above-mentioned deodorant carrying the ruthenium catalyst of the present invention is used in the second support.
In the method of supporting on a support, a solid acidic compound in the form of a powder may be used instead of the deodorant. Also here, a simple and effective method for supporting the solid acidic compound on the first support is to immerse the lattice-shaped or honeycomb-shaped filter substrate in an adhesive (for example, an acrylic emulsion adhesive) and pull it up. After that, a powder of the solid acidic compound is sprinkled on this.

Preferred examples of the liquid acidic compound include inorganic acids such as hydrochloric acid, sulfuric acid, perchloric acid, and heteropoly acids (for example, molybdophosphoric acid), and organic acids such as ascorbic acid and malic acid. be able to.

In order to support the liquid acidic compound on the first gas-permeable support, the support may be impregnated with the liquid acidic compound. Supported on a second porous carrier),
It is convenient to support the liquid acidic compound-supported porous support on the first gas-permeable support in the same manner as the method for supporting the ruthenium catalyst-supported deodorant on the second support. The second porous carrier that supports the liquid acidic compound does not need to have the property of adsorbing odor components as long as the second porous carrier can support the liquid acidic compound, but the same porous carrier as the first porous carrier should be used. And other materials such as silica. Activated carbon is particularly preferred as the second porous carrier.

In order to carry the liquid acidic compound on the second porous carrier, the second porous carrier may be immersed in the liquid acidic compound and dried.

In the deodorizing filter device of the present invention, the first filter member is disposed upstream of the second filter member in the ventilation direction. Usually, both filter members are combined with each other so as not to impair their air permeability. That is, for example, when the first filter member and the second filter member each have a similar substrate (support) having vent holes, both members can be bonded so that both vent holes are aligned. .

In the deodorizing filter device of the present invention,
When the basic compound coexists in the odor to be removed, the basic compound is previously adsorbed and removed by the acidic compound of the first filter member, so that the ruthenium catalyst of the second filter member located downstream thereof is It is sufficiently protected from attack by basic compounds and exerts the above-mentioned excellent oxidative decomposition action over a long period of time. Incidentally, tobacco smoke contains volatile nitrogen-containing basic odor components such as ammonia and pyridine. Note that acidic odor components such as acetic acid are not adsorbed on the ruthenium catalyst.

FIG. 1 is a front view partially showing a specific example of the deodorizing filter device of the present invention as viewed from a first filter member side. FIG. 2 is a cross-sectional view taken along line II-II of FIG. FIG. Deodorizing filter device 10 shown in FIGS. 1 and 2
Has the first filter member 11 and the second filter member 21 (see especially FIG. 2). Air permeable support (first support) 12 of the first filter member and air permeable support (second support) 22 of the second filter member
Have the same honeycomb structure. As is known per se, the honeycomb-structured supports 12 and 22 have a large number of hexagonal cells (vents) 13 and 23 gathered in such a manner as to share one side of the hexagon. Vent 1
The acidic compound (not shown) and the ruthenium catalyst-carrying deodorant (not shown) are respectively adhered to the surfaces of the partition portions 14 and 24 defining the partitions 3 and 23 by, for example, an adhesive. The first filter member 11 and the second
With the filter member 21, the ventilation holes 13 and 23 are aligned and overlapped so that the ventilation to the deodorizing filter device 10 is not hindered, and can be fixed with, for example, appropriate fixing tools at the four corners. This deodorizing filter device 10 can be installed and used on the indoor air inflow side of an indoor air conditioner such that the first filter member 11 is located on the upstream side of ventilation.

Needless to say, the first air-permeable support 12
The and the second permeable support 22 are not limited to the honeycomb structure as shown in FIG. 1 and may be rectangular, triangular or other lattice shapes. Further, the material constituting these supports may be any suitable material such as paper such as kraft paper, aluminum, and plastic. In the case of paper, it may be reinforced by impregnating it with a phenol resin or the like. it can. The air-permeable supports 12 and 22 may be subjected to a flame retarding treatment.

The deodorizing filter device of the present invention is disclosed in
It can be covered with a highly permeable net cover made of a heat-fusible fiber like a deodorizing filter for an air conditioner disclosed in JP-A-94716. FIG. 3 illustrates this aspect.

As shown in FIG. 3, the deodorizing filter device 10 of the present invention as described with reference to FIGS.
The whole is covered with a highly permeable net cover 31 (only a part is shown in FIG. 3). Net cover 3
1 is made of a heat-fusible fiber. The heat fusible fiber may be made of a single material or may have a composite structure. The heat-fusible fiber of the composite structure is, for example,
It has a structure composed of a polypropylene core material and a polyethylene sheath material having a melting point lower than that by 20 ° C. or more. Such heat-fusible fibers having a composite structure are disclosed in, for example,
No. 37097, and various types are commercially available. The diameter of the heat-fusible fiber is, for example, about 0.2 mm. The net cover 31 prevents the hand of the user of the deodorizing filter device 10 from directly contacting the deodorizing agent or the like attached thereto, thereby preventing the deodorizing agent or the like from dropping off and reducing the pressure loss of the deodorizing filter device 10. It is highly permeable so that it does not increase. The mesh size of the net cover 31 is, for example, about 1.5 mm.

The net cover 31 can cover the entire deodorizing filter device 10 by sandwiching the deodorizing filter device 10 between two nets and heat-sealing the net along the periphery of the deodorizing filter device 10. By this heat sealing, the heat sealing ears 32 are formed. The ears 32 ensure that the strength of the net cover is sufficient.

As shown in FIG. 3, the deodorizing filter device 10 can be provided with a life indicator 33, which is an indicator of the service life thereof, inside the net cover 31. The life indicator 33 is made of a fiber having an excellent dust-absorbing function, has some air permeability, and is made of a cloth-like material whose discoloration can be recognized. As such an indicator 33, a nonwoven fabric of electret fiber (a semi-permanently polarized polyolefin-based fiber disclosed in Japanese Patent Publication No. 56-47299) is preferable. The indicator 33 can be disposed as a band so as to cover a part of the ventilation hole of the deodorizing filter device 10 as shown in FIG.
As the contaminated air passes, it absorbs dust and discolors, indicating its life. In addition, the indicator 33 is not limited to a band-like one, and may be attached to the center or the corner of the deodorizing filter device 10 as a square or circular cloth.

In the present invention, particularly in the embodiment shown in FIG. 3, the first and second air-permeable supports are each 3
It preferably has a thickness of no less than about 15 mm and no more than about 15 mm. When these air-permeable supports have a lattice structure, the plane area (in a plane corresponding to the plane in the plan view in FIG. 1) of each of the air holes (corresponding to the air holes 13 in FIG. 1) is approximately it is preferably 0.2 to about 0.35 cm ^2. In this case, the opening ratio of the ventilation holes (on a plane corresponding to the plane in the plan view of FIG. 1) is about 50 to 80%.
It is preferred that Further, the first porous carrier and the second porous carrier (or the solid acidic compound) each have a mesh of about 20 to about 60 mesh (ie, 780 μm).
m to 250 μm). In addition, a ruthenium catalyst-supporting deodorant, a second supporting a liquid acidic compound
May be used at a rate of about 400 to about 2000 g / m ² , based on the plane area of the first permeable support and the second permeable support, respectively. preferable.

[0039]

EXAMPLES Examples of the present invention will be described below.

Example 1 <Preparation of ruthenium catalyst-supported deodorant> Coconut shell activated carbon (manufactured by Kuraray Chemical Co., Ltd., brand GG, 20 to 42 mesh) 10
g of ruthenium trichloride hydrate (RuCl ₃ .3H ₂₎ corresponding to 5% by weight of activated carbon as ruthenium.
O) in aqueous solution of ruthenium trichloride 100
ml was added. The mixture was evaporated to remove water, and the activated carbon was loaded with ruthenium trichloride. Then, the activated carbon carrying ruthenium trichloride was dried by heating at 80 ° C.
An activated carbon carrying a ruthenium catalyst (a deodorant carrying a ruthenium catalyst) was obtained.

The form of ruthenium present on the surface of the activated carbon was analyzed by an X-ray photoelectron spectrometer (XPS). As a result, Ru3d and 3p peaks of ruthenium were observed. From this result, ruthenium trichloride was RuO ₂
~ RuO ₄ was confirmed to be converted to ruthenium oxide.

<Preparation of Test Deodorizing Filter Device> (1) Activated clay (Galeonite 136 manufactured by Mizusawa Chemical Co., Ltd.)
4.1 g and H ⁺ -mordenite (HSZ manufactured by Tosoh Corporation)
-620HOD) 4.2 g of acrylic emulsion adhered to a kraft paper honeycomb substrate (first support) having a size of 5 cm × 5 cm × 1 cm (thickness) having a structure shown in FIGS. Two first filter members were prepared by impregnation using an agent. The one to which activated clay is attached is referred to as a first filter member A, and the one to which H ⁺ -mordenite is attached is referred to as a first filter member B.

(2) The activated carbon supporting the ruthenium catalyst.
2 g of the structure shown in FIGS. 1 and 2 with a size of 5 cm × 5 c
m × 1 cm (thickness) kraft paper honeycomb substrate (second
To the second support member using an acrylic emulsion pressure-sensitive adhesive to produce two second filter members.

(3) The first filter member A or B and the second filter member are overlapped so that their ventilation holes are aligned, and the four corners are fixed with fixtures to produce a test deodorizing filter device. did. First filter member A
The device having the first filter member B is called a deodorizing filter device A, and the device having the first filter member B is called a deodorizing filter device B.

<Treatment of Tobacco Smoke> A box chamber 40 made of polyvinyl chloride as shown in FIG.
Prepare m ³ ). A stirring fan 44 in the chamber 40 is attached to the upper wall 41 of the chamber 40. A test filter device (generally referred to as TF) is erected on the chamber bottom wall 42 so that the first filter member is located on the upstream side of the ventilation, and the ventilation fan 45 is driven from the rear to deodorize the wind. It is distributed to the filter device TF. The flow of the wind is indicated by arrows.

First, the test deodorizing filter device TF is installed in the chamber 40 as described above,
After burning commercially available cigarettes naturally within 2.5 minutes,
The ventilation fan 45 was driven and the test deodorizing filter device was allowed to stand for 1 hour under ventilation to perform a predetermined number of tobacco smoke load treatments.

<Measurement of Isoprene Removal Efficiency> A chamber having the same structure as that shown in FIG.
A test deodorizing filter device TF in which tobacco smoke is loaded a predetermined number of times at 25 m ³ ) is installed, and isoprene is injected into the chamber 40 with the micro syringe 46 through the side wall 43 to adjust the isoprene concentration in the chamber 40 to 50 ppm. did. Then, while ventilating the test filter device TF with the ventilation fan 45 at a speed of 1 m / sec for 30 minutes, the gas in the chamber 40 is collected by the micro syringe 47 through the side wall 43, and the residual concentration of isoprene is determined by gas chromatography. Measure. Isoprene removal efficiency η (%)
Is calculated by the following equation.

InC =-(Qη / V) t + lnC _{0 In the} above formula, C: isoprene residual concentration, C ₀ : isoprene initial concentration, V: chamber volume (0.125
m ³ ), t: time, Q: filtered air volume (0.15
m ³ / min).

FIG. 5 shows the obtained results. The results obtained by using only the second filter member without providing the first filter member are shown as controls. As can be seen from FIG. 5, the deodorizing filter device of the present invention shows an excellent deodorizing effect even after loading with tobacco smoke containing a basic compound.

[0050]

As described above, the deodorizing filter device of the present invention comprises a first filter member comprising a first support for supporting an acidic compound for adsorbing and removing a basic compound, and a ruthenium containing ruthenium oxide. This is a combination of a second filter member composed of a second support that supports a first porous carrier having an odor component adsorbing property and carrying a catalyst. In the second filter member, the odor component is adsorbed on the first porous carrier. Among the adsorbed odor components, the organic compound is transferred to the ruthenium catalyst, is oxidized and decomposed by the ruthenium catalyst, and is reversibly adsorbed and desorbed to release gas components of the decomposed product, so that the deodorizing effect is extremely high. Even when the odor contains a basic compound that inhibits the activity of the ruthenium catalyst, the acidic compound of the first filter member disposed upstream of the ventilation of the second filter member adsorbs the basic compound in advance. To remove
The original activity of the ruthenium catalyst of the second filter member is not lost for a long time. The second
The organic compound adsorbed on ruthenium oxide, which is the active point of the ruthenium catalyst of the filter member, can remarkably decompose at a relatively low temperature of 60 ° C. The performance of the deodorant can be recovered by passing the filter only when the adsorption capacity of the ruthenium catalyst-supported deodorant in the filter member is reduced.

[Brief description of the drawings]

FIG. 1 is a front view partially showing an example of a deodorizing filter device of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a plan view showing a state in which the deodorizing filter device of the present invention is covered with a highly permeable net.

FIG. 4 is a view for explaining a device used for a performance test of a deodorizing filter device.

FIG. 5 is a view showing the deodorizing performance of the deodorizing filter device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Deodorizing filter device 11 ... 1st filter member 12 ... 1st air-permeable support 13 ... 1st air-permeable support hole 14 ... 1st air-permeable support partition 21 ... 2nd filter Member 22: Second permeable support 23: Vent of second permeable support 24: Partition wall of second permeable support

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61L 9/00-9/22 B01J 20/02

Claims (4)

(57) [Claims] 1. A first filter member comprising a first gas-permeable support for supporting an acidic compound which adsorbs and removes a basic compound, and a first odor component-adsorbing first member carrying a ruthenium catalyst containing ruthenium oxide. Second supporting porous carrier
A deodorizing filter device comprising a combination of a second filter member made of a gas permeable support and an odor passing through the first filter member and then passing through the second filter member. 2. The deodorizing filter device according to claim 1, wherein the acidic compound supported on the first air-permeable support is a solid acidic compound. 3. The deodorizing filter device according to claim 2, wherein the solid acidic compound is selected from the group consisting of a zeolite, an acidic clay compound, and an acid-form ion exchange resin. 4. The acidic compound supported on the first air-permeable support is a liquid acidic compound, and is supported on the first air-permeable support in a form adsorbed on a second porous carrier. The deodorizing filter device according to claim 1.