JPH09187624A - Deodorizing filter and its regenerating method and air purifying device or air-conditioning device having deodorizing filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a deodorizing filter capable of removing simultaneously acetic acid, ammonia and acetaldehyde and capable of regenerating by providing integrally the first adsorbent layer having acidity together with basicity, the second adsorbent layer carrying an oxidizing agent, an oxidizing catalyst layer carrying an oxidizing catalyst and a heater. SOLUTION: In the deodorizing filter, the second adsorbent layer 2 and the oxidizing catalyst layer 3 are formed on the first adsorbent layer 1, and the heaters 4 and 5 are embedded in the oxidizing catalyst layer 3 and the first adsorbent layer 1 respectively. These are housed in a vessel consisting of a metal-made frame 6 and a wire mesh. That is, in the deodorizing filter, the first adsorbent layer 1 having acidity together with basicity, the second adsorbent layer 2 carrying the oxidizing agent and the oxidizing catalyst layer 3 carrying the oxidizing catalyst are laminated in order from a gas inlet side and housed in a permeable vessel 6, and the filter removes an acidic substance, a basic substance and a neutral substance such as acetic acid, ammonia and acetaldehyde and decomposes oxidatively a malodorous substance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing filter used in an air cleaning device or an air conditioner for removing a malodorous substance or a harmful component contained in the air.

[0002]

2. Description of the Related Art In recent years, there has been great interest in the removal of minute amounts of malodorous and harmful components contained in the air due to heightened awareness of health. Various malodorous substances and harmful components may be contained in the air. For example, smoke emitted from smoking cigarettes contains ammonia, acetic acid, acetaldehyde, tar and the like. A deodorizing filter using an adsorbent such as activated carbon or zeolite is known as a method for removing these malodorous components. In the case of an activated carbon filter, it exhibits an excellent adsorption ability for a component having a large molecular weight, but has a small adsorption ability for acetaldehyde, ammonia, acetic acid, etc. having a small molecular weight. Therefore, there is a method of impregnating activated carbon with an acidic substance or a basic substance to modify it, and removing acetic acid, which is an acidic gas, or ammonia, which is a basic gas, by utilizing a neutralization reaction between an acid and a base.

[0003]

However, the deodorizing filter using activated carbon has the following problems 1 and 2.

That is, 1. It cannot be used to remove the neutral substance acetaldehyde, and therefore a deodorizing filter capable of simultaneously removing acetaldehyde, acetic acid, and ammonia has not been realized.

[0005] 2. The filter must be replaced because there is no effective regeneration method for the adsorbent. As a regeneration method, desorption with heated steam or a heater can be considered,
If desorbed with steam, the malodorous components will be scattered and the malodor will be generated again. Further, when heated with a heater, not only the adsorbed components are discharged, but also activated carbon may be ignited.

The present invention has been made to solve the above conventional problems, and an object thereof is to provide a reproducible deodorizing filter capable of simultaneously removing acetic acid, ammonia and acetaldehyde.

[0007]

To achieve the above object, the deodorizing filter of the present invention comprises a first adsorbent layer having both acidity and basicity, a second adsorbent layer carrying an oxidant,
It is configured to have an oxidation catalyst layer supporting an oxidation catalyst, a heater, and a gas-permeable container that houses the first and second adsorbent layers, the oxidation catalyst layer, and the heater.

In this structure, the first adsorbent layer has a function of removing acetic acid which is an acidic substance and ammonia which is a basic substance. The second adsorbent layer has a function of oxidizing acetaldehyde, which is a neutral substance that could not be removed by the first adsorbent layer, into acetic acid and removing it. The oxidation catalyst layer has a function of oxidizing and decomposing a malodorous substance generated when the heater is heated to decompose it into an odorless component, and regenerating the adsorption ability of the first and second adsorbent layers.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In order to solve the problems of the present invention,
The invention according to claim 1 is a first adsorbent layer having both acidity and basicity, a second adsorbent layer carrying an oxidant, an oxidation catalyst layer carrying an oxidation catalyst, a heater, and the first And a deodorizing filter having a second adsorbent layer, an oxidation catalyst layer, and an aerable container containing a heater, capable of removing acidic substances, basic substances and neutral substances such as acetic acid, ammonia and acetaldehyde, and It can oxidize and decompose malodorous substances, and can also regenerate its adsorption ability.

Further, the invention according to claim 2 is such that a first adsorbent layer having both acidity and basicity in order from the gas inlet side, a second adsorbent layer carrying an oxidant, and an oxidation catalyst are carried. A stack of the above-mentioned oxidation catalyst layer and the mixture is housed in a gas-permeable container, which shows an effective means for filling the first adsorbent layer, the second adsorbent layer and the oxidation catalyst layer into the container. Is.

Further, in the invention according to claim 3, a heater is embedded in each of the first adsorbent layer having both acidity and basicity and the oxidation catalyst layer supporting the oxidation catalyst. Reproduce the deodorizing filter,
There is an effect that the malodor generated at that time can be deodorized by the oxidation catalyst.

In the invention according to claim 4, the first adsorbent layer which is embedded in the first adsorbent layer having both acidity and basicity and the oxidation catalyst layer supporting the oxidation catalyst is electrically heated to obtain the first adsorbent layer. When the adsorbent is regenerated, the temperature of the oxidation catalyst layer is set higher than the temperature of the first adsorbent layer, which shows an effective regeneration method of the deodorizing filter of the present invention.

The invention according to claim 5 is that the first adsorbent layer having both acidity and basicity, the oxidation catalyst layer carrying an oxidizing agent, the heater, the first and second adsorbent layers, An air purifier or an air conditioner equipped with a deodorizing filter having an oxidation catalyst layer and a breathable container that houses a heater, and has deodorizing ability not only for acidic substances and basic substances but also for neutral substances. By providing an effective deodorizing filter, excellent air purifying equipment or air conditioning equipment can be realized. In addition, the adsorbent can be regenerated odorlessly by energizing the heater.

In the invention according to claim 6, a particularly effective oxidation catalyst layer can be realized when the oxidation catalyst contains either platinum or palladium.

[0015]

【Example】

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 (a) shows the structure of the deodorizing filter according to the present invention, and shows a cross section taken along the line AB of the appearance of the deodorizing filter shown in FIG. FIG.
In (a), 1 indicates a first adsorbent layer, on which a second adsorbent layer 2 and an oxidation catalyst layer 3 are formed. Reference numerals 4 and 5 denote heaters, which are embedded in the oxidation catalyst layer 3 and the first adsorbent layer 1, respectively.

The first adsorbent layer 1, the second adsorbent layer 2, the oxidation catalyst layer 3, the heater 4 and the heater 5 are housed in a container composed of a metal frame 6, a wire net 7 and a wire net 8. .

A manufacturing example of the deodorizing filter shown in FIGS. 1A and 1B will be specifically described. A SUS band steel is bent to prepare a frame having an area of 10 cm × 15 cm and a height of 33 mm. Next, a SUS wire mesh is welded to prepare a container. As the first adsorbent layer, for example, Mizusawa Chemical Co., Ltd.
The deodorizer Mizukanite (6 to 8 mesh) is filled to a thickness of 10 mm, and a heater in a SUS protective tube is embedded at a position of about 1/2 of the filling height.

Next, commercially available activated alumina particles (6 to 8 mesh) carrying 1% of manganese dioxide as an oxidizing agent were filled on the first adsorbent layer until the thickness became about 10 mm, and Two adsorbent layers are formed. Next, a platinum-supported catalyst layer in which 1% of platinum is supported on commercially available activated alumina particles (6 to 8 mesh) is filled on the second adsorbent layer. At this time, set the sheath heater to 1 / of the bed height of the platinum-supported catalyst.
It is installed at the position 2 and is filled with an oxidation catalyst to embed the heater. Finally, after welding an SUS wire mesh to fix the adsorbent layer and the oxidation catalyst layer in the container, the heater terminal is insulated from the container, and a reet wire (not shown) is drawn to show the deodorizing filter shown in FIG. was gotten.

Example 2 In the same manner as in Example 1, commercially available activated alumina (6 to 8 mesh) was mixed with 1 part of palladium.
%, A deodorizing filter made of the same material as in Example 1 was manufactured.

Comparative Example A container having the same size as the container used in Example 1 was prepared for the purpose of comparing and examining the deodorizing filter of the present invention. Next, a commercially available granular activated carbon (6 ~
(8 mesh), and finally, a SUS wire mesh was welded to fix the activated carbon in the container to obtain an activated carbon filter. The weight of activated carbon used was 200 g.

For comparison of deodorizing performance, the volume is 1 m
^{At 3} , a prototype of a closed container with a blower fan (1 m ³ / min) was built. In this closed container, a shelf to which a deodorizing filter is attached is further installed, and when a blower fan is operated, a flow path is configured so that the entire amount of air sent from the fan passes through the deodorizing filter.

First, after attaching a deodorizing filter, the container was sealed, and acetaldehyde, acetic acid, and ammonia were filled in the container to adjust the concentration of each component to about 20 ppm. The blower fan was operated to circulate the air in the closed container, and after 1 hour, the gas in the closed container was sampled and the concentrations of acetaldehyde, acetic acid, and ammonia were measured by gas chromatography. The deodorization efficiency was calculated by {1- (gas concentration after 1 hour / initial concentration)} × 100.

After completion of the measurement, the closed container was opened, the air in the container was replaced with the atmosphere, and acetaldehyde, acetic acid, and ammonia were charged again so that each component was about 20 ppm, and the above measurement was repeated. Regarding the prototype filter, after repeating 5 times, the prototype deodorizing filter was energized and the deodorizing filter was kept at about 300 to 350 ° C. for 10 minutes for regeneration treatment. After cooling to room temperature, it was placed in the closed container again, and the same deodorization test as above was repeated. The activated carbon filter of the comparative example was not regenerated because there is a risk of ignition when heated.

By the above method, the deodorizing filters according to the present invention shown in Examples 1 and 2 have exactly the same tendency,
The effect was shown. FIG. 2 shows the results of determining the deodorizing efficiency for the activated carbon adsorption filters shown in Example 1 and Comparative Example.

As shown in FIG. 2, the activated carbon adsorption filter of the comparative example had a lower deodorizing efficiency of acetaldehyde, acetic acid and ammonia than that of Example 1 of the present invention.

[0026]

As is apparent from the above description, the deodorizing filter of the present invention can simultaneously remove each component of acetaldehyde, acetic acid and ammonia, and can maintain the deodorizing performance at a high level by the regeneration operation.

[Brief description of the drawings]

FIG. 1 (a) is an explanatory view showing a configuration of a deodorizing filter according to an embodiment of the present invention in section (b) an external perspective view of the same deodorizing filter

FIG. 2 is a characteristic diagram comparing the deodorizing performance of the deodorizing filter of the present invention with the activated carbon adsorption filter of the comparative example.

[Explanation of symbols]

 1 First Adsorbent Layer 2 Second Adsorbent Layer 3 Oxidation Catalyst Layer 4,5 Heater 6 Metal Frame 7,8 Wire Mesh

Claims (6)

[Claims] 1. A first adsorbent layer having both acidity and basicity, a second adsorbent layer carrying an oxidizing agent, an oxidation catalyst layer carrying an oxidation catalyst, a heater, and the first and second adsorption layers. A deodorizing filter having an agent layer, an oxidation catalyst layer, and an aerable container containing a heater. 2. A first adsorbent layer having both acidity and basicity, a second adsorbent layer carrying an oxidizing agent, and an oxidation catalyst layer carrying an oxidation catalyst, which are laminated in this order from the gas inlet side. Deodorizing filter stored in a breathable container. 3. The deodorizing filter according to claim 2, wherein a heater is embedded in each of the first adsorbent layer having both acidity and basicity and the oxidation catalyst layer supporting the oxidation catalyst. 4. When regenerating the adsorbent of the first adsorbent layer by electrically heating the heaters embedded in the first adsorbent layer having both acidity and basicity and the oxidation catalyst layer supporting the oxidation catalyst, A method for regenerating a deodorizing filter, wherein the temperature of the oxidation catalyst is set higher than the temperature of the first adsorbent layer. 5. A first adsorbent layer having both acidity and basicity, a second adsorbent layer carrying an oxidizing agent, an oxidation catalyst layer carrying an oxidation catalyst, a heater, and the first and second adsorption layers. An air purifying device or an air conditioner equipped with a deodorizing filter having an agent layer, an oxidation catalyst layer, and an aerable container containing a heater. 6. A deodorizing filter in which the oxidation catalyst according to any one of claims 1 to 5 is a complete oxidation catalyst of platinum or palladium, a method of regenerating the deodorizing filter, and an air cleaning device or an air conditioner having the deodorizing filter.