JPH10296043A - Gad adsorption filter for air conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas adsorption filter suitable for an air conditioning device for adsorbing and removing in a wide range of various kinds of gas components in a living space. SOLUTION: An adsorption filter F is provided with a preceding stage adsorption layer 1 and a succeeding adsorption layer 3 disposed on the downstream side of air flow of the layer 1. Respective layers 1 and 3 are of the constitution of fixing gas adsorbers on the surfaces of respective honeycomb base gratings 1a and 3a. The gas adsorbers used for the preceding adsorption layer 1 is unmodified active carbon, and the gas adsorber used for the succeeding adsorption layer 3 is, for example, chemically modified active carbon for adsorbing aldehydes. In the adsorption filter F, mainly generated gas content can be adsorbed by the unmodified active carbon on the preceding adsorption layer, and then mainly for example, aldehydes like aldehyde and the like can be adsorbed by the chemically modified active carbon on the succeeding adsorption layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a gas adsorption filter for an air conditioner suitable for adsorbing and removing various gas components in a living space.

[0002]

2. Description of the Related Art Conventionally, odorous gases and toxic gases existing in living and living spaces are of various types and relatively low in concentration. Modified activated carbon is frequently used. On the other hand, in the industrial field, a packed-tower system in which a mixture of chemically modified activated carbon is packed in a packed tower or the like at a high density is used for a relatively limited type of high-density exhaust gas.

[0003] Here, the above-mentioned "chemically modified activated carbon" refers to activated carbon to which a chemical substance having an ability to adsorb a specific substance has been applied, and the above-mentioned "unmodified activated carbon" refers to such a treated substance. Activated carbon that has not been treated.

[0004] The unmodified activated carbon alone adsorbs gas components having a relatively small molecular weight and a high polarity, such as aldehyde-based gases and basic gases such as ammonia, among various gas components in the living space. The performance is low, and a well-balanced deodorizing effect on living odors cannot be expected. On the other hand, the packed tower method is not suitable for a filter for an air conditioner due to a large pressure loss.

[0005]

Therefore, conventionally, an adsorbent filter comprising a granular deodorizer such as activated carbon and an adsorbent in which a catalyst is supported on inorganic porous particles such as zeolite (Japanese Patent Laid-open No.
JP-A-299720), an adsorption filter comprising an adsorbent obtained by mixing activated carbon impregnated with a base, activated carbon impregnated with malic acid and iron salts, and neutral activated carbon.
No. 0315) has also been proposed.

However, in the former filter, since the adsorption speeds of the activated carbon and the catalyst are different, it is impossible to always expect a balanced adsorption performance. In addition, the latter filter has a problem in that the ability to adsorb a basic gas or an aldehyde-based gas is low.

Further, a three-layer filter comprising three adsorbent layers each having unmodified activated carbon, chemically modified activated carbon for adsorbing ammonia, and chemically modified activated carbon for adsorbing aldehydes (Japanese Patent Laid-Open No. 62-241526). However, with a multilayer structure having three or more layers, there is a problem that the pressure loss becomes too large for a filter for an air conditioner.

The present invention has been made in view of the above points, and provides a gas adsorption filter which can adsorb and remove a wide variety of gas components in a living space widely and effectively, and is suitable for an air conditioner. The purpose is to do.

[0009]

The first means comprises a pre-adsorption layer using unmodified activated carbon as a gas adsorber, and a downstream side of the air flow with respect to the pre-adsorption layer, which converts the chemically modified activated carbon into gas. A gas adsorption filter for an air conditioner, comprising: a subsequent adsorption layer serving as an adsorbent.

According to the first means, after the general gas components are mainly adsorbed by the unmodified activated carbon in the pre-adsorption layer,
The chemically modified activated carbon in the latter adsorption layer can mainly adsorb a gas component having a low molecular weight and a high polarity as compared with a general gas component. This allows, of course, general gas components,
Even with a gas component having a low molecular weight and a high polarity as compared with a general gas component, high adsorption performance can be exhibited. Further, the pressure loss can be suppressed to be smaller than that having three or more adsorption layers.

A second means is the first means, wherein the thickness of the preceding adsorption layer is 1.5 times or more the thickness of the latter adsorption layer.

[0013] A third means is the first means, wherein the former adsorbing layer and the latter adsorbing layer each have a base lattice formed of a set of unit cells and to which the gas adsorbent is fixed. The distance between the first-stage adsorption layer and the second-stage adsorption layer is set to be equal to or less than the unit cell size of the substrate lattice of the second-stage adsorption layer.

A fourth means is the first means, wherein each of the former adsorbent layer and the latter adsorbent layer has a base lattice formed of a set of unit cells and to which the gas adsorbent is fixed, The unit cell size of the substrate lattice of the former adsorption layer is set to 0.5 times or less the unit cell size of the substrate lattice of the latter adsorption layer.

A fifth means is that, in the first means, the former adsorbent layer and the latter adsorbent layer are each composed of a set of unit cells, and the gas adsorbent is fixed and the unit cell dimensions are the same. A substrate lattice is provided, and the former adsorption layer is arranged such that each unit cell axis of the substrate lattice corresponds to a lattice intersection of the substrate lattice of the latter adsorption layer.

According to the second to fifth means, the first
In particular, high adsorption performance can be maintained over a long period of time especially for a gas component having a low molecular weight and a high polarity as compared with a general gas component.

The sixth means is that a mixture of at least three types of activated carbon particles of unmodified activated carbon, chemically modified activated carbon for adsorption of aldehydes, and chemically modified activated carbon for adsorption of basic gas is fixed to the surface of the substrate lattice. A gas adsorption filter for an air conditioner, characterized in that the gas adsorption filter is characterized in that:

According to the sixth means, a mixture of three types of activated carbon particles can exhibit high adsorption performance for aldehydes, basic gas and other general gas components. Further, the pressure loss can be suppressed to be smaller than that provided with a multilayer adsorption layer.

According to a seventh aspect, in the sixth aspect, the mixture of the activated carbon particles comprises 30 to 50% by weight of the unmodified activated carbon and 30 to 50% by weight of the chemically modified activated carbon for adsorbing aldehydes.
50% by weight, the chemically modified activated carbon for basic gas adsorption 1
5 to 25% by weight.

According to the seventh means, the aldehydes, the basic gas, and other general gas components can be adsorbed in a well-balanced and effective manner in the sixth means.

Eighth means is the sixth or seventh means, wherein each of the activated carbon particles constituting the mixture of the activated carbon particles has a particle size within a range passing through a standard sieve of 20 to 42 mesh. is there.

According to the eighth aspect, in the sixth or seventh aspect, the gas components of the aldehydes, the basic gas, and other general gas components are balanced with a relatively low pressure loss. Can be adsorbed.

[0022]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 7 are views showing an embodiment of a gas adsorption filter for an air conditioner according to the present invention.

[First Embodiment] First, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 (a)
, The gas adsorption filter F for an air conditioner includes a pre-stage adsorption layer 1 and a post-stage adsorption layer 3 disposed downstream of the air flow with respect to the pre-stage adsorption layer 1. Further, each of the adsorption layers 1 and 3 has a structure in which a gas adsorbent is fixed to the surface of the base lattices 1a and 3a, respectively.

Here, FIG. 1 (b) shows a part of the base lattice 1a of the pre-adsorption layer 1. As shown in FIG. 1 (b), the substrate lattice 1a is a honeycomb-shaped one composed of a group of a large number of unit cells 2 having a hexagonal cross section. In addition,
The base lattice 3a of the latter adsorption layer 3 is also basically the same in shape as the base lattice 1a shown in FIG.

The gas adsorbent used in the first adsorption layer 1 is unmodified activated carbon, and the gas adsorbent used in the first adsorption layer 3 is chemically modified activated carbon for aldehyde adsorption.
Here, the above-mentioned “chemically modified activated carbon” refers to activated carbon that has been subjected to an impregnation treatment with a chemical substance (in this case, for example, a primary amine) capable of adsorbing a specific substance (in this case, aldehydes). The “unmodified activated carbon” refers to activated carbon that has not been subjected to such treatment.

Next, the operation of the present embodiment having such a configuration will be described. According to the present embodiment, after the general gas component is mainly adsorbed by the unmodified activated carbon of the former adsorption layer, mainly the chemically modified activated carbon of the latter adsorption layer has a low molecular weight and a high polarity compared to the general gas component. Gas components of aldehydes such as acetaldehyde can be adsorbed. As a result, not only general gas components but also gas components of aldehydes having low molecular weight and high polarity as compared with general gas components can exhibit high adsorption performance. Further, the pressure loss can be suppressed to be smaller than that having three or more adsorption layers.

[0027]

Here, if an example of the present embodiment is shown, the pre-adsorption layer 1 is 10 mm thick (refers to the thickness in the air flow direction of FIG. Dimension 2.5
Unmodified coconut shell activated carbon having a particle size in the range of passing through a standard sieve of 20 to 42 mesh is fixed to the surface of a substrate lattice 1a of 1 mm per square meter at a rate of 1 kg per square meter. Further, as the latter-stage adsorption layer 3, chemically modified activated carbon for aldehyde adsorption having a particle size in a range of passing through a standard sieve of 20 to 42 mesh is provided on the surface of a base lattice 3a having a thickness of 5 mm and a unit cell size of 5.5 mm. Use what is fixed at a rate of 1 kg per square meter. The distance between the two adsorbing layers 1 and 3 is 1 mm.

In the present embodiment, the latter adsorbing layer 3
Although the case where chemically modified activated carbon for aldehydes adsorption is used as the gas adsorbent of the above is described, the gas adsorbent of the latter adsorbing layer 3 is provided with another gas component having a low molecular weight and a high polarity compared to a general gas component ( For example, a chemically modified activated carbon having an improved ability to adsorb a basic gas component) may be used. And
In that case, the same effect as the above-described effect can be expected for the gas component.

[Second Embodiment] Next, a second embodiment of the present invention will be described. This embodiment is different from the first embodiment in that the thickness of the pre-adsorption layer 1 is
Is 1.5 times or more the thickness of the first embodiment, and the other configuration is the same as that of the first embodiment shown in FIG.

Next, the test results regarding the present embodiment will be described. The ratio of the thickness of the former adsorption layer 1 to the thickness of the latter adsorption layer 3 based on the gas adsorption filter as shown in the example of the first embodiment (the former thickness / the latter thickness ratio).
A gas adsorption performance test was performed using as a parameter.

Specifically, a gas adsorption filter is installed in a test chamber filled with smoke from a certain number of cigarettes, and air is blown for a certain time at a constant passing air velocity by a blower fan, and the gas removal rate in the chamber is reduced. Was measured for each of several types of adsorption filters having different thickness ratios of the preceding stage / the latter stage.

As a result, as shown in FIG.
The relationship between the latter thickness ratio and the relative breakthrough time for adsorption to acetaldehyde was obtained. Here, the “adsorption breakthrough time” refers to the elapsed time from the start of adsorption (for acetaldehyde) to the point where the substance to be adsorbed (acetaldehyde) can no longer be adsorbed by saturated adsorption. In addition, the “adsorption breakthrough relative time” in the present embodiment is a relative suction breakthrough time based on the adsorption breakthrough time when the ratio of the former-stage thickness / the latter-stage thickness is 1.

Then, from the results shown in FIG.
It can be seen that in the region where the ratio of the rear-stage thickness is 1.5 or more, the adsorption breakthrough relative time is significantly improved as compared with the region where the ratio of the front-stage thickness / the rear-stage thickness is smaller. Therefore, according to this embodiment in which the thickness of the first-stage adsorption layer 1 is set to be 1.5 times or more the thickness of the second-stage adsorption layer 3, it is possible to maintain high adsorption performance for acetaldehyde for a long time.

It should be noted that the relative adsorption breakthrough time shown in FIG. 2 is substantially constant in a region where the ratio of the front-stage thickness / the rear-stage thickness is 1.5 or more, while the ratio of the front-stage thickness / the rear-stage thickness exceeds 10. In this embodiment, it is preferable that the ratio of the front-stage thickness / the rear-stage thickness be in the range of 1.5 to 10 because the pressure loss of the filter significantly increases.

[Third Embodiment] Next, a third embodiment of the present invention will be described. This embodiment is different from the first embodiment in that the distance between the former adsorbing layer 1 and the latter adsorbing layer 3 is set to be equal to or less than the unit cell size of the base lattice 3a of the latter adsorbing layer 3. The configuration is the same as that of the first embodiment shown in FIG.

Next, the test results of the present embodiment will be described. Based on the gas adsorption filter as shown in the example of the first embodiment, a test of the gas adsorption performance was performed using the distance between the pre-adsorption layer 1 and the post-adsorption layer 3 (the pre-stage / post-stage interval) as a parameter. Was.

More specifically, a gas adsorption filter is installed in a test chamber filled with smoke from a certain number of cigarettes, and air is blown for a certain time at a constant passing air velocity by a blower fan, and the gas removal rate in the chamber is reduced. Was measured for each of several types of adsorption filters having different pre-stage / post-stage intervals.

As a result, as shown in FIG. 3, a relationship was obtained between the former-stage / second-stage intervals and the relative breakthrough time with respect to acetaldehyde. Here, the "adsorption breakthrough relative time" in the present embodiment is a relative suction breakthrough time based on the suction breakthrough time when the distance between the first and second stages is 6 mm.

From the results shown in FIG. 3, it can be seen that, in the region where the front / rear gap is less than 5.5 mm in the unit cell size of the latter adsorbing layer 3, the adsorbing breakthrough relative to the region where the former / later spacing is larger. It can be seen that the time has improved. Therefore,
According to the present embodiment in which the distance between the first-stage adsorption layer 1 and the second-stage adsorption layer 3 is equal to or less than the unit cell size of the substrate lattice 3a of the second-stage adsorption layer 3, high acetaldehyde adsorption performance is maintained for a long time. Can be kept.

In the state where the first-stage adsorption layer 1 and the second-stage adsorption layer 3 are in contact with each other, if one adsorbent is saturated, molecules move to the other non-saturated adsorbent, and the phenomenon of equilibrium adsorption occurs. To prevent this, it is necessary to avoid contact between the two adsorbing layers 1 and 3. In consideration of the expansion of the base lattices 1a and 3a of the two adsorbing layers 1 and 3,
In order to avoid contact between the two adsorbing layers 1 and 3, it is considered necessary to secure a minimum distance of 1 mm between the first and second stages. Therefore, in the present embodiment, the distance between the first and second stages is set to be equal to or less than the unit cell size of the base lattice 3a of the second adsorption layer 3 and 1 mm.
It is preferable to be within the above range.

[Fourth Embodiment] Next, a fourth embodiment of the present invention will be described. In the present embodiment, the unit cell size of the base lattice 1a of the first adsorption layer 1 in the first embodiment is 0.5 times or less the unit cell size of the base lattice 3a of the second adsorption layer 3. The other configuration is the same as that of the first embodiment shown in FIG.

Next, the test results relating to the present embodiment will be described. On the basis of the gas adsorption filter as shown in the example of the first embodiment, the substrate grid 3 of the subsequent adsorption layer 3 is used.
The base lattice 1a of the pre-adsorption layer 1 with respect to the unit cell size of a
The gas adsorption performance was tested using the ratio of the unit cell dimensions (the former cell dimension / the latter cell dimension ratio) as a parameter.

Specifically, a gas adsorption filter is installed in a test chamber filled with smoke from a certain number of cigarettes, and air is blown for a certain time at a constant passing air velocity by a blower fan, and the gas removal rate in the chamber is reduced. Was measured for several kinds of adsorption filters having different ratios of the former-stage cell dimensions / the latter-stage cell dimensions.

As a result, as shown in FIG. 4, a relationship between the ratio of the size of the former-stage cell / the size of the latter-stage cell and the relative breakthrough time for acetaldehyde was obtained. Here, the “adsorption breakthrough relative time” in the present embodiment is a relative adsorption breakthrough time based on the adsorption breakthrough time when the former-stage cell size / the latter-stage cell size ratio is 0.5.

From the results shown in FIG. 4, it can be seen that the relative time for adsorption breakthrough is improved in the region where the former-stage cell size / the latter-stage cell size ratio is 1 or less as compared with the region where the ratio is larger than 1. I understand. Particularly, in a region where the ratio of the former-stage cell size / the latter-stage cell size is 0.5 or less, a large improvement in the adsorption breakthrough relative time is observed. Therefore, the base lattice 1a of the pre-adsorption layer 1
According to the present embodiment in which the unit cell size is 0.5 times or less the unit cell size of the base lattice 3a of the subsequent adsorption layer 3, high acetaldehyde adsorption performance can be maintained for a long time.

It should be noted that the relative time of the adsorption breakthrough shown in FIG. 4 is significantly reduced when the ratio of the former-stage cell size to the latter-stage cell size is less than 0.1. 0.1 / 0.5
Is preferably within the range.

[Fifth Embodiment] Next, a fifth embodiment of the present invention will be described. As shown in FIG. 5, this embodiment is different from the first embodiment in that the unit cells 2, 4 of the base lattices 1a, 3a of the pre-adsorption layer 1 and the post-adsorption layer 3 are different.
And the axes of the unit cells 2 of the base lattice 1a (unit cell axes) 5 correspond to the grid intersections 6 of the base lattice 3a of the latter adsorption layer 3, respectively. The other configuration is shown in FIG.
Is the same as the first embodiment shown in FIG.

Next, the test results relating to the present embodiment will be described. On the basis of the gas adsorption filter as shown in the example of the first embodiment, the dimensions of the unit cells 2 and 4 of the base lattices 1a and 3a of the adsorption layers 1 and 3 are set to be the same, and Each unit cell axis (first cell axis) 5 is a lattice intersection (second lattice intersection) 6 of the base lattice 3a of the second adsorption layer 3.
The gas adsorption performance of two types, one having a positional relationship corresponding to the above (the present embodiment) and one having a positional relationship corresponding to the axis of the preceding cell 4 (the latter cell axis) 7 (comparative example). The test was performed.

More specifically, a gas adsorption filter is installed in a test chamber filled with smoke from a certain number of cigarettes, and air is blown for a certain time at a constant passing air velocity by a blower fan. Was measured for the adsorption filter of the present embodiment and the adsorption filter of the comparative example.

As a result, as shown in FIG. 6, there was obtained a difference in the relative breakthrough time of adsorption to acetaldehyde when the positional relation of the former cell shaft 5 with respect to the latter substrate lattice 3a was changed. Here, the “adsorption breakthrough relative time” in the present embodiment refers to the relative suction based on the suction breakthrough time of the one in which the preceding cell axis 5 corresponds to the latter lattice intersection 6 (the suction filter of the present embodiment). Breakthrough time.

According to the results shown in FIG. 6, according to the adsorption filter of this embodiment in which the preceding cell axis 5 has a positional relationship corresponding to the latter lattice intersection 6, the former cell axis 5 corresponds to the latter cell axis 7. It can be seen that the relative adsorption breakthrough time for acetaldehyde is more than doubled compared to the comparative example having a positional relationship. Accordingly, the adsorbing performance is improved by shifting the former cell shaft 5 from the positional relationship corresponding to the latter cell shaft 7 as in the comparative example. In particular, the former cell shaft 5 corresponds to the latter lattice intersection 6 as in the present embodiment. By having a positional relationship, it is possible to maintain high adsorption performance for acetaldehyde for a long time.

In the above-described second to fifth embodiments, the case where a test for acetaldehyde is performed has been described. However, other gas components having a low molecular weight and a high polarity compared to general gas components (for example, other gas components). Aldehydes and basic gas components) are also applied to the latter adsorption layer 3 by applying a chemically modified activated carbon having an enhanced ability to adsorb the gas components, thereby basically providing the second to fifth embodiments described above. The same operation and effect as the operation and effect can be expected.

Further, according to the second to fifth embodiments, the chemically modified activated carbon of the latter adsorption layer 3 maintains high adsorption performance for a long period of time, so that the unmodified activated carbon of the former adsorption layer 1 It is possible to maintain the balance with the adsorption performance for a long time. This makes it difficult for the balance between the adsorption removal rates of the different types of odor gas components by the respective adsorption layers 1 and 3 to change easily, so that the effect of suppressing the generation of offensive odor due to the unbalanced odor gas concentration can be expected.

[Sixth Embodiment] Next, a sixth embodiment of the present invention will be described. In the present embodiment, FIG.
On the surface of a single honeycomb-shaped base lattice similar to the base lattice 1a shown in (3), unmodified activated carbon, chemically modified activated carbon for adsorbing aldehydes, and chemically modified activated carbon for adsorbing basic gas are placed.
This is a gas adsorption filter in which a mixture of activated carbon particles of various types is fixed as a gas adsorbent. Here, the chemically modified activated carbon for adsorbing aldehydes is, for example, activated carbon subjected to a primary amine impregnation treatment, and the chemically modified activated carbon for basic gas adsorption is activated carbon subjected to an acid impregnation treatment. It is.

Next, the operation of the present embodiment having such a configuration will be described. According to this embodiment, a mixture of three types of activated carbon particles can exhibit high adsorption performance with respect to each of the aldehyde-based gas, the basic gas such as ammonia, and other general gas components. Further, the pressure loss can be suppressed to be smaller than that provided with a multilayer adsorption layer.

In this embodiment, as a mixture of activated carbon particles, 30 to 50% by weight (% by weight) of unmodified activated carbon and 30 to 50% by weight of chemically modified activated carbon for adsorbing aldehydes are used.
50wt%, chemically modified activated carbon for basic gas adsorption 15-2
The use of 5 wt% is preferred in order to adsorb aldehydes, basic gas, and other general gas components in a well-balanced and effective manner. In addition, for each activated carbon particle, a particle having a particle size passing through a standard sieve of 20 to 42 mesh is used, while keeping the pressure loss relatively low, while using aldehyde-based gas, basic gas, and other general gas. This is preferable for adsorbing each gas component of the gas components in a well-balanced manner.

Next, with reference to FIG. 7, an example of the present embodiment will be described in comparison with six comparative examples.

First, in this embodiment, a unit cell size of 4.2 mm, a thickness of 5 mm, a length of 159 mm and a width of 283 mm was used as a substrate lattice.
Using a honeycomb-shaped substrate lattice of
Unmodified activated carbon (hereinafter referred to as A), chemically modified activated carbon (primary amine-impregnated carbon) particles for adsorbing aldehydes (hereinafter referred to as B)
That. ) And a mixture of three types of activated carbon particles of a chemically modified activated carbon (acid-impregnated carbon) particle for adsorbing a basic gas (hereinafter referred to as C).

The mixing ratio of the three types of activated carbon particles is A
40 wt% / B 40 wt% / C 20 wt%, and each of the activated carbon particles A to C has a particle size within a range that passes through a standard sieve of 20 to 42 mesh. The amount of the activated carbon particle mixture adhered to the substrate lattice surface is 1
1 kg per square meter.

(Comparative Example) First, in Comparative Example 1, the mixture ratio of activated carbon in the above example was A100 wt% / B0 wt% / C0 wt.
%, That is, only unmodified activated carbon having the same particle size is used.

Next, in Comparative Example 2, each of the activated carbon particles of Examples A to C was replaced with a particle size within a range of passing through a 100-mesh standard sieve. The fixed amount of the activated carbon particle mixture on the surface is set to 0.7 kg per square meter, which is the maximum for the particle size. In Comparative Example 3, the particle size of each of the activated carbon particles A to C in the above example was changed to a particle size in a range passing through a standard sieve of 20 mesh or less.
The amount of the activated carbon particle mixture fixed to the surface of the substrate lattice was set to 1.3 kg per square meter.

Next, in Comparative Examples 4, 5, and 6, the activated carbon mixing ratio of the above example was A20 wt% / B40 wt%, respectively.
% / C40wt%, A40wt% / B20wt% / C40wt
% And A50 wt% / B40 wt% / C10 wt%.

(Comparative Test) In each of the above Examples and the six Comparative Examples, a gas adsorption filter was installed in a test chamber filled with smoke from a fixed number of cigarettes, and a blowing fan was used for a fixed time at a constant passing air velocity. And the gas removal rate and pressure loss (P
a: 1 m / s). Regarding the gas removal rate, the respective gas removal rates of acetic acid as an ordinary gas component, acetaldehyde as an aldehyde gas component, and ammonia as a basic gas component were measured.

As a result, according to this example, it was confirmed that the removal rate of all gas components was 90% or more, and that each gas component could be effectively removed in a well-balanced manner. On the other hand, in Comparative Example 1, since the chemically modified activated carbons B and C were not mixed as in this example, the removal rates of acetaldehyde and ammonia were considerably low. Further, in Comparative Example 2, the removal rate of acetaldehyde and ammonia was low because the particle size of the activated carbon was smaller and the total amount of activated carbon was smaller than in this example.

Next, in Comparative Example 3, the same gas removal rate was obtained for each gas component as in this example. However, since the particle size of the activated carbon was too large, the pressure loss was lower than that in this example. Has more than doubled. In Comparative Example 4, since the mixing ratio of the unmodified activated carbon A was lower than in this example, the acetic acid removal rate was slightly lower.

Further, in Comparative Example 5, since the mixing ratio of the chemically modified activated carbon B for adsorbing aldehydes is lower than in this example, the acetaldehyde removal rate is lower. In Comparative Example 6, the mixing ratio of the chemically modified activated carbon C for basic gas adsorption was lower than that of the present example, so that the ammonia removal rate was lower.

In the first to sixth embodiments described above, a case has been described in which a honeycomb-shaped substrate lattice made up of a set of unit cells having a hexagonal cross section is used as the substrate lattice of the adsorption layer. However, the present invention is not limited thereto, and a base lattice made of a set of unit cells having other cross-sectional shapes such as a square may be used.

[0068]

According to the first aspect of the present invention, not only general gas components but also gas components having a low molecular weight and a high polarity as compared with general gas components can exhibit high adsorption performance. A wide variety of gas components can be adsorbed and removed in a living space. In addition, since the pressure loss can be suppressed to be smaller than that of the air conditioner having three or more adsorption layers, it is possible to reduce a decrease in the air conditioning performance and the operation efficiency of the air conditioner.

According to the sixth aspect of the present invention, an aldehyde, a basic gas,
And high adsorption performance for each gas component of other general gas components. Therefore, main gas components in the living space can be effectively adsorbed and removed. Also, compared to those with a multi-layer adsorption layer,
Since the pressure loss can be suppressed to a small value, a decrease in the air conditioning performance and operating efficiency of the air conditioner can be reduced.

[Brief description of the drawings]

FIG. 1 is a view showing a structure of a first embodiment of a gas adsorption filter for an air conditioner according to the present invention, wherein (a) is an entire longitudinal sectional view and (b) is a perspective view showing a part of a base lattice. FIG.

FIG. 2 is a graph showing the effect of the second embodiment of the gas adsorption filter for an air conditioner according to the present invention.

FIG. 3 is a graph showing an effect of the third embodiment of the gas adsorption filter for an air conditioner according to the present invention.

FIG. 4 is a graph showing the effect of the fourth embodiment of the gas adsorption filter for an air conditioner according to the present invention.

FIG. 5 is an enlarged front view showing a part of a fifth embodiment of the gas adsorption filter for an air conditioner according to the present invention.

FIG. 6 is a graph showing the effect of the fifth embodiment of the gas adsorption filter for an air conditioner according to the present invention.

FIG. 7 is a table showing the effect of the sixth embodiment of the gas adsorption filter for an air conditioner according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Pre-adsorption layer 1a Substrate lattice of pre-adsorption layer 2 Unit cell of substrate lattice of pre-adsorption layer 3 Sub-adsorption layer 3a Substrate lattice of post-adsorption layer 4 Unit cell of substrate lattice of post-adsorption layer 5 Unit cell axis of pre-adsorption layer (Front cell axis) 6 Lattice intersection of the base lattice of the latter adsorption layer (Latter lattice intersection) F Gas adsorption filter

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI B01D 53/81 B01D 53/34 120D 53/72 F24F 1/00 371Z B01J 20/20 F24F 1/00

Claims (8)

[Claims] 1. A pre-adsorption layer using unmodified activated carbon as a gas adsorbent, and a post-adsorption layer disposed downstream of the air flow with respect to the pre-adsorption layer and using chemically modified activated carbon as a gas adsorber. A gas adsorption filter for an air conditioner. 2. The method according to claim 1, wherein the thickness of the preceding adsorption layer is at least 1.5 times the thickness of the latter adsorption layer.
The gas adsorption filter for an air conditioner according to the above. 3. The pre-adsorption layer and the post-adsorption layer each have a base lattice formed of a set of unit cells and to which the gas adsorbent is fixed. 2. The gas adsorption filter for an air conditioner according to claim 1, wherein an interval between the adjacent cells is equal to or less than a unit cell dimension of a substrate lattice of the second adsorption layer. 3. 4. The pre-adsorption layer and the post-adsorption layer each comprise a set of unit cells, each having a base lattice to which the gas adsorbent is fixed, and a unit cell dimension of the base lattice of the pre-adsorption layer. 2. The gas adsorption filter for an air conditioner according to claim 1, wherein the size of the unit cell is 0.5 times or less the unit cell size of the substrate lattice of the second adsorption layer. 3. 5. The pre-adsorption layer comprises a set of unit cells, the gas adsorbent is fixed to the pre-adsorption layer, and the unit cell dimensions are the same. The gas adsorption filter for an air conditioner according to claim 1, wherein each of the unit cell axes of the substrate lattice is arranged so as to correspond to a lattice intersection of the substrate lattice of the subsequent adsorption layer. 6. A mixture of at least three types of activated carbon particles, that is, unmodified activated carbon, chemically modified activated carbon for adsorbing aldehydes, and chemically modified activated carbon for adsorbing basic gas, which is fixed to the surface of the substrate lattice. A gas adsorption filter for an air conditioner, comprising: 7. The mixture of activated carbon particles comprises 30 to 50% by weight of the unmodified activated carbon, 30 to 50% by weight of the chemically modified activated carbon for adsorbing aldehydes, and 15 to 25% of the chemically modified activated carbon for adsorbing basic gas. The gas adsorption filter for an air conditioner according to claim 6, wherein the gas adsorption filter is composed of% by weight. 8. The air conditioner according to claim 6, wherein all of the activated carbon particles constituting the mixture of the activated carbon particles have a particle size in a range of passing through a standard sieve of 20 to 42 mesh. For gas adsorption filter.