JPH10202046A - Dust collecting and deodorizing filter for air conditioner and regenerating method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the regeneration of a deodorizing filter and to maintain excellent adsorption efficiency over a long period by making a dust collecting and deodorizing filter made of a dust collecting filter and the deodorizing filter, forming the deodorizing filter from one containing a porous adsorbent and freely detachably attaching to an air conditioner. SOLUTION: The dust collecting and deodorizing filter used for the air conditioner of automobile is constituted of the dust collecting filter and the deodorizing filter and had a structure capable of disassembling into the dust collecting filter and deodorizing filter. The deodorizing filter has a honeycomb structure consisting essentially of an activated carbon and is formed by applying the absorbent on the surface of a carrier. And the deodorizing filter is formed to have a cell density of 100-800/in<2> and uses one kind of an element selected from a group composed of Pt, Pd, Rh, Ir, Os, Au and the like and if necessary, one kind of an element selected from a group composed of Al, Ce, La, Pr, Zr and the like as the catalytic components contained in the absorbent and decomposing the adsorbed malodor component.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a dust removing and deodorizing filter used for an air conditioner, particularly to an air conditioner of an automobile, and a regeneration system for the deodorizing filter.

[0002]

2. Description of the Related Art A filter of an air conditioner for an automobile is mounted for the purpose of improving the quality of air introduced into a passenger compartment. The life of this filter depends on the environment of the area where the car is running, but is currently about six months to one year. As use continues, the adsorption efficiency gradually decreases. In order to maintain the air quality in the cabin at a certain level or more for a long period of time, it is necessary to increase the size of the filter. However, this is undesirable because it increases filter cost, ventilation resistance, and difficulty in mounting. Therefore, a filter having a small size and high adsorption efficiency is required.

[0003] The filter is composed of a filter having a dust removing performance and a filter having a deodorizing performance as required. Filters are replaced and discarded at regular intervals, and generally no regeneration operation is performed.

[0004] On the other hand, the idea of regenerating a deodorizing filter is described in, for example, Society of Automoto.
Document 9694 of Ive Engineers, Inc.
3 (Title: Low Back Pressure, Hi
gh EfficiencyAutomotive Ca
bin Air Odor Filters). This is obtained by adhering activated carbon to a ceramic honeycomb carrier generally used in an automobile exhaust gas purifying catalyst. The activated carbon coated ceramic honeycomb is electrically heated to remove odor components adsorbed on the activated carbon. Heating is carried out with the filter mounted on the car, the power supply being the draw of the car battery and / or external power supply.

[0005]

However, such a conventional filter may have the following problems to be improved.

[0006] Continuing replacement and disposal without performing a regenerating operation leads to waste of limited resources.

According to the idea of a deodorizing filter that can be regenerated, the deodorizing filter is regenerated with the filter attached to the vehicle. No consideration has been given to where the odorous components and dust particles desorbed by heating are guided. If the air is blown out from the air outlet of the air conditioner, these spread to the cabin and adhere to the seat, ceiling, and instrument panel. It is clear that this is an undesirable condition. In particular, since the amount of the adsorbed odor component is large, the amount of the adhering odor component may be larger than during use of the filter. In order to prevent degassed gas from drifting in the cabin, even when installing a duct that guides gas from inside the cabin to the outside at the air outlet of the air conditioner, harmful gas and dust particles may be trapped in the evaporator and duct inside the air conditioner. It may stick and may drift in the cabin during subsequent use.

[0008] Providing a dedicated outlet for taking out gas and the like in the air conditioner causes harmful gas components and the like to be randomly released into the atmosphere outside the vehicle, which may be undesirable from the viewpoint of environmental conservation.

Further, a deodorizing filter obtained by applying activated carbon to a ceramic carrier is fragile due to the properties of the constituent material of the carrier,
Damage may be caused by vibration of the air conditioner.

The present invention has been made in view of such a conventional problem. By removing the filter from the air conditioner so that the filter can be regenerated, the regeneration of the deodorizing filter is facilitated to extend the life of the filter. An object of the present invention is to provide a dedusting and deodorizing filter for an air conditioner for an automobile which can maintain adsorption efficiency and effectively utilize limited resources, and a method for regenerating the filter.

[0011]

According to the present invention, there is provided a dust removing / deodorizing filter incorporated in an air conditioner, wherein the dust removing / deodorizing filter comprises a dust removing filter and a deodorizing filter, and the filter for deodorizing comprises a porous adsorbent. It is characterized by including a material and being detachably attached to an air conditioner.

Further, the present invention provides a dust removing and deodorizing filter,
It has a structure that can be disassembled into a dust filter and a deodorizing filter.

Further, the present invention is characterized in that the deodorizing filter is a honeycomb mainly composed of activated carbon.

Further, the present invention is characterized in that the deodorizing filter has a structure comprising a carrier and an adsorbent applied to the surface thereof.

Further, the present invention is characterized in that the deodorizing filter has a structure having a large number of ventilation holes through which gas flows.

Further, the present invention is characterized in that the deodorizing filter is obtained by applying a slurry in which the main component of the solid content is activated carbon and / or zeolite to a carrier and fixed thereto.

Further, the present invention is characterized in that the adsorbent of the deodorizing filter has an adsorbent layer containing activated carbon and / or zeolite as a main component and, if necessary, a catalyst component for decomposing the adsorbed odor component. I do.

Further, according to the present invention, there is provided a honeycomb structure comprising a metal foil or a nonwoven fabric of an inorganic oxide or a paper made of an inorganic oxide fiber, wherein the carrier of the deodorizing filter is a metal and / or a metal.
And a honeycomb-structured wire frame composed of inorganic oxide fibers and a foamed metal.

Further, the present invention is characterized in that the cell density of the deodorizing filter is in the range of 100 to 800 cells per square inch.

Further, according to the present invention, the catalyst component comprises Pt, P
at least one element from the group consisting of d, Rh, Ru, Ir, Os, and Au, and if necessary, Al, Ce, La,
Pr, Zr, Ba, K, Cs, Fe, Ni, Mn, Z
It is characterized by containing at least one element from the group consisting of n and Cu.

Further, according to the present invention, the catalyst component of the deodorizing filter is such that the amount of an element of the group consisting of Pt, Pd, Rh, Ru, Ir, Os, and Au is 0.1 wt.
% Or more and 25 wt% or less.

Further, according to the present invention, the catalyst component of the deodorizing filter is preferably composed of Al, Ce, La, Pr, Zr, Ba, K, C
The amount of an element in the group consisting of s, Fe, Ni, Mn, Zn, and Cu is not more than 25 wt% based on the weight of the adsorbent.

Further, the method for regenerating a dedusting and deodorizing filter according to the present invention is directed to a dust removing and deodorizing filter for an air conditioner comprising a dust removing filter and a deodorizing filter, wherein the filter for deodorizing contains a porous adsorbent. The air conditioner is detachably loaded with a deodorizing filter, and the attached deodorizing component is separated and removed by heating the removed deodorizing filter. Thereafter, the air conditioner is reloaded.

Further, in the method for regenerating a dust removing and deodorizing filter of the present invention, the filter contains air or oxygen in at least a part of the step of heating the deodorizing filter removed from the air conditioner to desorb and decompose odor components. A method for regenerating a deodorizing and deodorizing filter for an air conditioner, the method comprising a step of performing while flowing gas.

Further, the method for regenerating a dust removing and deodorizing filter of the present invention comprises heating at least a part of the step of heating the deodorizing filter removed from the air conditioner to desorb and decompose odor components while reducing the pressure. Features.

Further, the method for regenerating a dust removing and deodorizing filter according to the present invention is a method for desorbing and decomposing an odor component from a deodorizing filter detached from an air conditioner, the equipment for regenerating an oxidation catalyst for treating desorbed gas. Is provided, and the desorbed gas is brought into contact therewith.

Further, the method for regenerating a deodorizing filter according to the present invention is characterized in that the acid used for cleaning the deodorizing filter removed from the air conditioner is at least one acid selected from the group consisting of nitric acid, hydrochloric acid and sulfuric acid. Features.

Further, the method for regenerating a dust removing and deodorizing filter according to the present invention is characterized in that, in the cleaning of the deodorizing filter removed from the air conditioner, a cleaning liquid in which the filter is soaked is heated.

[0029]

Next, embodiments of the present invention will be described in detail. The dust removing and deodorizing filter incorporated in the air conditioner is composed of a dust removing filter and a deodorizing filter, and the deodorizing filter contains a porous adsorbent. This dust removing and deodorizing filter is detachably attached to the air conditioner.

The method for regenerating the dedusting and deodorizing filter of the present invention is as follows: (1) The deodorizing filter may be damaged or deformed by heat treatment.
It is made of a material that is not likely to deteriorate. (2) The deodorizing filter is not attached to the air conditioner of the car, but is removed therefrom to perform the regeneration process. (3) To promote decomposition by heating at lower temperature,
Add the catalyst component to the deodorizing filter. (4) As means for the regeneration treatment, decomposition and desorption of harmful components by heating and / or washing with a solution are used.

First, the configuration of the deodorizing filter will be described. The deodorizing filter performs deodorization by absorbing odor components. The component for adsorption, that is, the adsorbent, contains activated carbon and / or zeolide as a main component as an adsorption layer, and may further contain activated carbon fibers, silica gel, aluminum hydroxide, and sepiolite. The activated carbon fiber is employed in a chopped shape. FIG. 1 is an enlarged view of a cell of an example of a deodorizing filter according to the present invention, and is an explanatory view showing a state where an adsorbent is attached to a carrier.

The adsorption performance of the material of the adsorption layer is improved as the specific surface area is increased. However, when the specific surface area of the material of the adsorption layer is 1800 m ² / g or more, the pore volume becomes large, so that the deodorized odor becomes strong, and at the same time, the bulk density becomes small, so that the weight per unit area of the adsorbent decreases. May occur. Therefore, the specific surface area is 800 to 180
Desirably, it is 0 m ² / g.

It is desirable to have a catalyst component for decomposing odor components in addition to the adsorption layer. The catalyst component is added so that the process can be performed quickly and at a low temperature in the heating step of the desorption decomposition process of the odor component. The adsorption concentrates the odor component in the air at a low concentration and exists near the catalyst component. Therefore, if the catalyst is activated, the decomposition efficiency is high. The concentration of odor components floating in the air is usually as low as the ppb level, and the temperature of the catalyst is low, so that substantially no reaction can take place.

As the catalyst component, Pt, Pd, Rh, R
at least one element from the group consisting of u, Ir, Os, and Au, and if necessary, Al, Ce, La, Pr, Zr,
At least one element can be selected from the group consisting of Ba, K, Cs, Fe, Ni, Mn, Zn, and Cu. These elements promote the decomposition of adsorbed harmful gas components, mainly oxidative decomposition.

Pt, Pd, Rh, Ru, Ir, Os, A
The element of the group consisting of u is desirably in an amount of 0.1 wt% or more and 25 wt% or less based on the weight of the adsorbent. If less than 0.1 wt%, the effect of addition cannot be expected, and 25 wt%
%, The adsorbent is reduced in amount to lower the adsorbing ability, and the effect cannot be expected even if it is added more.
As a method of adding an element of the group consisting of Pt, Pd, Rh, Ru, Ir, Os, and Au, for example, impregnation of an adsorbent with an aqueous solution of a salt of the element, Al, Ce, La, Pr,
Zr, Ba, K, Cs, Fe, Ni, Mn, Zn, Cu
A known method such as kneading with the material of the adsorption layer after supporting the oxide by the impregnation method can be employed.

Al, Ce, La, Pr, Zr, Ba,
Elements of the group consisting of K, Cs, Fe, Ni, Mn, Zn, and Cu are added to the adsorbent as needed. The amount is desirably 25 wt% or less based on the weight of the adsorbent. These elements are usually added as oxides. A
1, Ce, La, Pr, Zr, Ba, K, Cs, Fe,
As a method of adding an element of the group consisting of Ni, Mn, Zn, and Cu, a known method such as impregnation of an adsorbent with an aqueous solution of a salt of the element or mixing of an oxide or a salt can be employed.

In addition, when a compound which desorbs and decomposes when heated to improve or improve the adsorption characteristics, for example, when an impregnating agent containing an amino group is added to the adsorption layer, the compound may be decomposed and decomposed after heating or the like. Alternatively, impregnation and activation treatment with a salt solution can be performed.

The deodorizing filter is composed of a carrier for fixing the adsorbent on the surface thereof, a structure composed of the adsorbent applied to the surface thereof and / or a filter containing the adsorbent as a main component and a binder acting as a paste for the adsorbent. It can have an integrated structure formed by extrusion. Also, the adsorption filter
Since it is required that the air flow resistance is low and the contact efficiency is high, it is desirable to have a large number of air holes through which air passes (this is called a cell).

When a carrier is used, its structure is made of a honeycomb structure composed of a metal foil and a nonwoven fabric of inorganic oxide or paper made of inorganic oxide fibers, and a fiber composed of metal and / or inorganic oxide. It is desirable to use either a honeycomb-structured wire frame or a foamed metal. In the case of a wire frame, the adsorbent enters the gap between the wire frames, but there is no problem. FIG. 2 is an enlarged view of a cell of another example of the deodorizing filter according to the present invention. The honeycomb body is a honeycomb structure containing activated carbon as a main component and a wire frame having the honeycomb structure (hereinafter, unless otherwise noted, the honeycomb body). Etc.) can reduce the ventilation resistance. The material is any carrier,
Desirably, it is required not to be deformed or damaged even when heat up to 300 ° C. is applied.

When no carrier is used, a honeycomb structure composed of activated carbon as an adsorbent is desirable. The catalyst component may be added at the time of kneading, or may be supported by impregnation with an aqueous solution of a salt after forming the honeycomb structure. As a manufacturing method, for example, a method disclosed in JP-A-8-103632 can be used.

As a method for manufacturing a honeycomb body, metal foil,
In the case of non-woven fabric and paper, a method of corrugating a part of the paper to form a corrugated sheet and winding it up together with an unprocessed flat sheet, or a method of so-called laminating by alternately stacking corrugated sheets and flat sheets Can be adopted. Many cells are formed by this processing. In the case of a wire frame having a honeycomb structure composed of metal or / and inorganic oxide fibers, a known method such as a method of forming a net with fibers, winding up the same as the honeycomb body, using a method such as lamination, and then tying with fibers. A method may be employed. As a method of fixing and holding the shape of the honeycomb body or the like, methods such as welding, brazing, and fixing with a fastener are used for metal foil, and fixing with an inorganic adhesive is used for inorganic oxide nonwoven fabric or paper. A method may be employed. FIG. 3 is an enlarged view of a carrier cell of another example of the deodorizing filter according to the present invention. This is a structure in which corrugated foils and flat foils are alternately laminated. Also,
FIG. 4 is an enlarged view of a cell of a deodorizing filter obtained by attaching an adsorbent to the carrier of FIG.

As the cross-sectional shape of the honeycomb cell, a cell cross-sectional shape of a honeycomb body having a generally rectifying effect, such as a square, a triangle, or a circle, can be employed.

The density of cells such as a honeycomb body is preferably in the range of 100 to 800 cells per square inch. If the number is less than 100, a so-called pass-through that passes through without contacting the adsorbent may occur, which is not desirable. This is because the production of 800 or more cells is difficult, the contact frequency is not improved much by increasing the cell density, and the ventilation resistance is remarkably increased.

The thickness of the cell wall of the honeycomb body or the like is determined based on both the low airflow resistance and the shape retention of the honeycomb body, but it is desirable that the wall be as thin as possible. Usually 20 μm to 300 μm
m.

The cross-sectional shape of the honeycomb body or the like can vary depending on the internal dimensions of the air conditioner to be employed, but its thickness is about 2 mm to 30 mm, usually about 5 mm to 15 mm.

As a method of applying the adsorbent to the honeycomb body or the like, a method of applying a slurry in which the adsorbent and, if necessary, a catalyst component are dispersed in a solvent can be used. Water is desirable as the dispersion medium. A binder can be used to fix the adsorbent or the like to the honeycomb body or the like.
As the binder, it is desirable to use heat-resistant alumina sol, silica sol, silica-alumina sol, clay mineral and acrylic polymer or styrene / butadiene polymer. As a coating method, a honeycomb body or the like is immersed in a slurry, the slurry is introduced into the cell, and then pulled up, and a method of removing excess slurry closing the cell by air blow, or applying the slurry to the honeycomb body or the like from above. A method of removing excess slurry blocking the cells by vacuum suction from below, or a method of immersing a lower end surface of a honeycomb body or the like in a pool of slurry and suctioning the slurry by vacuum suction from above can be adopted. The slurry attached to the honeycomb body or the like is dried and further heated to be fixed. The amount of adhesion is 0.2 g or more, preferably 0.6 g or more per 1 cc of the volume of the honeycomb body or the like. If it is 0.2 g or less, the life of the adsorbent is short, the interval of regeneration → use is short, and it is inconvenient and undesirable for a vehicle maintainer.

Next, a reproducing method will be described. Remove the deodorant from the car before regenerating. Playing in a car is undesirable, as described above. Regenerating deodorizing filters are usually integrated. It is desirable to have a structure that can be separated from the dust filter. The regeneration method includes a heating step of the deodorizing filter. By heating, the harmful gas components and the like that have been adsorbed can be efficiently desorbed and decomposed. Heating is preferably performed at a lower temperature in terms of safety and energy consumption. The temperature is preferably 300 ° C. at the maximum, preferably 150 ° C. or less, and the processing time is preferably 5 minutes to 2 hours. The heating step may be performed at normal pressure, may be performed while passing a gas containing oxygen to promote desorption and decomposition, that is, may be performed under oxidation reaction conditions, may be performed in the presence of steam, or may be performed under reduced pressure conditions. It may be carried out under the condition, that is, under the condition that harmful gas components and the like are easily desorbed. Of course, a plurality of conditions may be used as appropriate.

Heating is performed by generating Joule heat utilizing the electric resistance of the filter, by a microwave, by passing hot air through a filter cell, or by placing it in a furnace with electricity or gas and externally. Any method of warming may be used. Desirably, it is desirable to use a device capable of controlling the temperature so that the filter does not burn out due to overheating.

The heat treatment heats the deodorizing filter.
When the catalyst component of the adsorbent is included, the odor component is decomposed. Some odor components can evaporate. The temperature of the evaporated odor component becomes high, so that if a catalyst for decomposition and purification is attached to the regeneration treatment equipment, the treatment can be performed. For the decomposition and purification reaction of the odor component that has become the vapor, for example, a known oxidation catalyst can be used. The conditions for using the deodorizing filter in the air conditioner (temperature: -20 ° C ~
In the range of 60 ° C. and the passing gas flow rate: 9 m ³ / min at the maximum)
There is almost no catalyst in which the decomposition reaction occurs.

In the regeneration method, a washing step using an acid may be used in addition to the heating step. The cleaning solution can be selected from aqueous solutions of nitric acid, hydrochloric acid and sulfuric acid. The harmful gas components and the like adsorbed by the acid washing are eluted and decomposed. In acid washing, it is desirable to heat the washing solution to promote elution and decomposition. The deodorized filter after the regeneration process can be mounted on an air conditioner of a car and used again.

Hereinafter, examples of the present invention will be described in detail with reference to comparative examples, but the present invention is not limited thereto.

The production of the deodorizing filter will be described. << Example 1 >> (Manufacture of carrier) Stainless steel foil (s
US304), and the corrugated foil is alternately laminated with the unprocessed flat foil to have a cell density of 400 cells / square inch and a 200 × 200 (cross-sectional dimension). A honeycomb body having a thickness of 10 mm is formed. The end faces of the honeycomb body are welded by a laser to join the foils together.

(Fixing of adsorption layer to carrier) 50 parts by weight of activated carbon (granular white eagle Gx) manufactured by Takeda Pharmaceutical Co., Ltd., boehmite alumina sol (weight ratio as alumina 10%) 5
0 parts by weight are mixed with a vibration mill to form a slurry, and the carrier is immersed in the slurry. The carrier is taken out of the slurry, and excess slurry clogged in the cells of the honeycomb body is blown off with compressed air. Then, after drying at 120 ° C. for 30 minutes, 3
It was baked at 00 ° C. for 30 minutes to obtain a deodorizing filter 1 to which 0.6 g of the adsorbent was adhered per 1 cm ³ of volume.

Example 2 A deodorizing filter 2 was obtained in the same manner as in Example 1, except that 0.8 g of activated carbon was adhered per 1 cm ³ of volume.

Example 3 In Example 1, the composition of the slurry was changed to 50 parts by weight of activated carbon supporting 2 parts by weight of platinum with respect to the weight of activated carbon, and 50 parts by weight of boehmite alumina sol (weight ratio as alumina: 10%). A deodorizing filter 3 was obtained in the same manner as above.

Example 4 A deodorizing filter 4 was obtained in the same manner as in Example 3, except that 10 parts by weight of platinum was supported with respect to the weight of the activated carbon.

Example 5 In Example 1, the composition of the slurry was 50 parts by weight of activated carbon in which silver was supported by 2 parts by weight based on the weight of activated carbon, and 50 parts by weight of boehmite alumina sol (weight ratio as alumina: 10%). A deodorizing filter 5 was obtained in the same manner as above.

Example 6 In Example 1, the composition of the slurry was 45 parts by weight of activated carbon, 5 parts by weight of alumina carrying platinum (the amount of platinum was 10 parts by weight with respect to the weight of alumina), and boehmite alumina sol ( Deodorizing filter 6 was obtained in the same manner except that 50 parts by weight of alumina (weight ratio of 10%) was used. The alumina carrying platinum is obtained by impregnating alumina SBa200 (manufactured by Condea Co., Ltd.) in an aqueous chloroplatinic acid solution, drying it at 120 ° C. for 2 hours, and baking it at 400 ° C. for 1 hour.

Example 7 A deodorizing filter 7 was obtained in the same manner as in Example 6, except that the metal supported on alumina was palladium (20 parts by weight based on alumina).

Example 8 A deodorizing filter 8 was obtained in the same manner as in Example 6, except that zirconia was used as the platinum-supporting compound.

Example 9 In Example 1, the composition of the slurry was changed to 45 parts by weight of activated carbon, 5 parts by weight of copper oxide, and boehmite alumina sol (weight ratio as alumina: 10%).
Deodorizing filter 9 was prepared in the same manner except that the amount was 50 parts by weight.
I got

Example 10 In Example 1, the composition of the slurry was 45 parts by weight of activated carbon, 3 parts by weight of copper oxide, 2 parts by weight of ceria, and 50 parts by weight of boehmite alumina sol (weight ratio as alumina: 10%). Except for the above, a deodorizing filter 10 was obtained.

Example 11 A deodorizing filter 11 was obtained in the same manner as in Example 1, except that the thickness of the honeycomb body was changed to 20 mm.

Example 12 A deodorizing filter 12 was obtained in the same manner as in Example 1, except that the thickness of the honeycomb body was changed to 5 mm.

Example 13 A deodorizing filter 13 was obtained in the same manner as in Example 1, except that the cell density of the honeycomb body was changed to 600 cells / square inch.

Example 14 A fine powder such as charcoal, coal, coke, coconut palm, sawdust, etc.
A binder and an activator such as a clay mineral were added, and the mixture was kneaded using water as a medium and formed into a honeycomb shape to obtain a deodorizing filter 14. The dimensions of the deodorizing filter are the same as those of the deodorizing filter 1, the cell density is 400 cells / square inch, and the cell wall thickness is 100 μm.

Comparative Example 1 A deodorizing filter 20 was obtained in the same manner as in Example 1, except that the amount of activated carbon was changed to 0.2 g per 1 cm ³ of volume.

Comparative Example 2 A deodorizing filter 21 was obtained in the same manner as in Example 1, except that the cell density was changed to 50 cells / square inch.

Next, the evaluation of the initial deodorizing performance of the deodorizing filter will be described. The deodorizing performance of the deodorizing filter was measured. That is, the deodorizing filters 1 to 14 and the deodorizing filters 20 and 21 as comparative examples were arranged in the passage of the air conditioner of the automobile, and the dust removing filter was arranged upstream thereof. The vehicle was driven on a general road with four panelists in the cabin. Four panelists evaluated the odor intensity of the deodorizing performance during running of the diesel vehicle during running. 0 for no odor, 1 for odor that can be detected at last, 2 for what odor is known, 3 for odor that can be easily detected, 4 for strong odor, and 5 for intense odor,
The evaluation values of the panelists were averaged to obtain an evaluation result A. The performance of the deodorizing filters 20 and 21 of the comparative examples is inferior to those of the deodorizing filters 1 to 14 of the examples.

Next, deodorizing filters 1 to 14 and filters 20 and 21 as comparative examples, which explain the promotion of deterioration of the deodorizing filter, were disposed in the passage of an air conditioner of a vehicle, and a dust filter was disposed upstream thereof. . This dust filter can remove 50% of fine particles having a particle diameter of 0.3 μm or less.
It has the above-mentioned adsorption performance. I drove about 20,000 km on a general road with such a car.

Next, the evaluation of the deodorizing performance after using the deodorizing filter will be described. Evaluation was performed in the same manner as in the initial deodorizing performance evaluation method, and an evaluation result B was obtained. The deodorizing filters 20 and 21 of the comparative example are the deodorizing filters 1 to 1 of the examples.
4 is inferior in performance to 4.

[Regeneration Process 1] Next, the regeneration process of the deodorizing filter will be described. The deteriorated deodorizing filter was removed from the automobile, and heated at 300 ° C. for 2 hours in an electric furnace.

[Evaluation 1 of Deodorizing Performance after Regeneration of Deodorizing Filter] Next, evaluation of deodorizing performance after regeneration of the deodorizing filter will be described. Evaluation was performed in the same manner as in the initial deodorizing performance evaluation method, and an evaluation result C was obtained. When the evaluation results A, B, and C are compared, the following can be said. The values of A and C of the deodorizing filters 1 to 14 were almost the same, indicating that the regeneration effect was obtained.

The deodorizing filters 20 and 21 of the comparative examples have lower deodorizing performance than the deodorizing filters 1 to 14 of the examples,
It shows that the reproduction ability is also small.

[Regeneration treatment 2] Of the deodorized filters degraded, 1, 2, 20, 21 were regenerated by the following method.・ 5
After being immersed in a 3N aqueous solution of nitric acid at 0 ° C. for 30 minutes, the substrate was washed with water, placed in an electric furnace maintained at 80 ° C. for 10 minutes, and dried.

Next, the dried deodorizing filter was heated in an electric furnace at 250 ° C. for 20 minutes. [Evaluation of Deodorizing Performance after Regeneration of Deodorizing Filter 2] Evaluation was performed in the same manner as in the initial deodorizing performance evaluation method, and evaluation result D was obtained. [Evaluation Results] Deodorizing Filter ABD1 1.50 3.75 1.50 2 1.25 3.50 1.50 Comparative Example 20 3.5 4.5 3.50 Comparative Example 21 3.75 4.75 3.50 [Regeneration treatment 3] Among the deteriorated deodorizing filters,
2, 20, and 21 were reproduced by the following method. After being immersed in a mixed aqueous solution of nitric acid at 50 ° C. and 6N for 10 minutes, the substrate was washed with water, placed in an electric furnace maintained at 80 ° C. for 10 minutes, and dried.

Next, the dried deodorizing filter was heated in an electric furnace at 300 ° C. for 30 minutes. [Evaluation of Deodorizing Performance after Regeneration of Deodorizing Filter 3] Evaluation was performed in the same manner as in the initial deodorizing performance evaluation method, and the evaluation result E was obtained. [Evaluation Results] Deodorizing Filter ABE1 1.50 3.75 1.50 2 1.25 3.50 1.25 Comparative Example 20 3.5 4.5 3.50 Comparative Example 21 3.75 4.75 3.50

[0078]

[Table 1]

The dust removing and deodorizing filter of the present invention comprises a dust removing filter and a deodorizing filter, and the deodorizing filter contains an adsorbent. This makes it difficult for harmful component gases and dust particles to enter the passenger compartment of the car, thereby improving the air quality of the passenger compartment.

Since the deodorizing filter can desorb and desorb the harmful gas component adsorbed by heating, it can be used again. Since the reproduction process is possible, limited resources can be effectively used.

By adding a catalyst component to the adsorption layer, regeneration by heating can be performed at a lower temperature and in a shorter time. Since the deodorizing filter has a configuration having a number of cells through which air flows, the ventilation resistance is low. Since the harmful gas components adsorbed on the deodorizing filter can be decomposed and desorbed by the heat regeneration treatment, the size of the filter can be reduced. As described above, according to the present invention, it is possible to provide a deodorizing filter having excellent performance which can be used repeatedly and can be used for a long time as a result.

According to the method for regenerating the deodorizing filter of the present invention, since the deodorizing filter is removed from the vehicle and the treatment is performed, it is possible to prevent the occurrence of a problem that the harmful gas component desorbed from the deodorizing filter is filled in the cabin of the vehicle. . Further, it is not necessary to provide a device for releasing the harmful gas component out of the vehicle in the air conditioner. Furthermore, the random release of harmful gas components into the atmosphere outside the vehicle may be undesirable from an environmental conservation point of view.

Since the regeneration process of the deodorizing filter in the present invention includes a heating step, a gas containing a heated harmful gas component is generated. Since this gas has a high temperature, it can be easily treated by a known method such as an oxidation catalyst widely used for air treatment in factories. As described above, according to the present invention, the regeneration processing of the dust removing and deodorizing filter can be easily performed.

[0084]

As described in detail above, if the dust removing and deodorizing filter of the present invention is used, the filter can be regenerated repeatedly, so that limited resources can be effectively used, the size of the filter can be reduced, and the regenerating process can be performed. Can be easily implemented.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a cell of an example of a deodorizing filter according to the present invention. This is a state in which the adsorbent is attached to the carrier.

FIG. 2 shows an enlarged view of a cell of another example of the deodorizing filter according to the present invention. A honeycomb structure containing activated carbon as a main component.

FIG. 3 shows an enlarged view of a carrier cell of another example of the deodorizing filter according to the present invention. This is a structure in which corrugated foils and flat foils are alternately laminated.

FIG. 4 is an enlarged view of a cell of a deodorizing filter obtained by attaching an adsorbent to the carrier of FIG.

Claims (18)

[Claims] 1. A dust removing and deodorizing filter incorporated in an air conditioner, wherein the dust removing and deodorizing filter comprises a dust removing filter and a deodorizing filter, and the deodorizing filter includes a porous adsorbent, and the air conditioner A dust removing and deodorizing filter for an air conditioner, which is detachably attached to the filter. 2. A dust removing and deodorizing filter for an air conditioner, wherein the dust removing and deodorizing filter according to claim 1 has a structure that can be disassembled into a dust removing filter and a deodorizing filter. 3. A deodorizing filter for an air conditioner, wherein the deodorizing filter according to claim 1 is a honeycomb containing activated carbon as a main component. 4. A dedusting and deodorizing filter for an air conditioner, wherein the deodorizing filter according to claim 1 has a structure comprising a carrier and an adsorbent applied to the surface thereof. 5. A dedusting and deodorizing filter for an air conditioner, wherein the deodorizing filter according to claim 1 has a structure having a large number of ventilation holes through which gas flows. 6. The air conditioner according to claim 1, wherein the carrier is coated with a slurry whose main component is activated carbon and / or zeolite. For dust removal and deodorization filter. 7. The deodorizing filter according to claim 1, wherein the adsorbent has an adsorbent layer containing activated carbon and / or zeolite as a main component and, if necessary, a catalyst component for decomposing the adsorbed odor component. Dust removal and deodorization filter for air conditioners. 8. A honeycomb structure comprising a metal foil, a nonwoven fabric of an inorganic oxide, or a paper obtained by filtering inorganic oxide fibers, and a metal and / or an inorganic oxide. A dust removing and deodorizing filter comprising a honeycomb-structured wire frame formed of the fibers described above and a foamed metal. 9. A dedusting and deodorizing filter according to claim 5, wherein the cell density of the deodorizing filter according to claim 5 is in the range of 100 to 800 cells per square inch. 10. The catalyst component according to claim 7, comprising at least one element selected from the group consisting of Pt, Pd, Rh, Ru, Ir, Os, and Au, and if necessary, Al, C
e, La, Pr, Zr, Ba, K, Cs, Fe, Ni,
A dust removing and deodorizing filter for an air conditioner, comprising at least one element from the group consisting of Mn, Zn, and Cu. 11. The catalyst component of the deodorizing filter according to claim 10, wherein the amount of an element of the group consisting of Pt, Pd, Rh, Ru, Ir, Os, and Au is 0.1 wt% based on the weight of the adsorbent. Above 2
A dust removing and deodorizing filter for an air conditioner, wherein the content is 5 wt% or less. 12. The catalyst component of the deodorizing filter according to claim 10, wherein Al, Ce, La, Pr, Zr, Ba, K, Cs, F
A dust removing and deodorizing filter for an air conditioner, wherein the amount of elements in the group consisting of e, Ni, Mn, Zn, and Cu is 25 wt% or less based on the weight of the adsorbent. 13. A dust removing and deodorizing filter for an air conditioner comprising a dust removing filter and a deodorizing filter, wherein the filter for deodorizing contains a porous adsorbent and the filter for deodorizing is detachably attached to the air conditioner. A method for regenerating a dust removal and deodorization filter for an air conditioner, comprising heating and removing the loaded and removed deodorization filter to separate and remove attached odor components, and then reloading the air conditioner. 14. The regeneration method according to claim 13, wherein a gas containing air or oxygen is passed through the filter in at least a part of the step of heating the deodorizing filter removed from the air conditioner to desorb and decompose odor components. A method for regenerating a deodorizing and deodorizing filter for an air conditioner, the method comprising: 15. The method according to claim 13, wherein the deodorizing filter removed from the air conditioner is heated while reducing the pressure in at least a part of the step of desorbing and decomposing odor components. How to regenerate the dust removal and deodorization filter. 16. The regeneration method according to claim 13 or 14, wherein the oxidizing catalyst for treating the desorbed gas is regenerated by desorbing and decomposing odor components from the deodorizing filter detached from the air conditioner. A method for regenerating a dedusting and deodorizing filter, comprising providing equipment and bringing desorbed gas into contact with the equipment. 17. The regeneration method according to claim 13, wherein the acid used for cleaning the deodorizing filter removed from the air conditioner is at least one acid selected from the group consisting of nitric acid, hydrochloric acid, and sulfuric acid. The method of regenerating the dust removal and deodorization filter. 18. The method for regenerating a deodorizing filter according to claim 17, wherein in cleaning the deodorizing filter removed from the air conditioner, a cleaning liquid in which the filter is soaked is heated.