JPH09206589A - Adsorbent for air purification and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an adsorbent for air purification which has excellent initial performance and can always have specified adsorption and removing performance without being influenced by the working environment by depositing a specified amt. of an acidic material, a basic material and an oxidizing agent on a specified activated carbon and then introducing a specified amt. of water to be held in the activated carbon material with deposition of the agents. SOLUTION: This adsorbent for air purification consists essentially of an activated carbon material prepared by depositing one of an acidic material, basic material and oxidizing agent, or an oxidizing agent and an acidic material or basic material by 1 to 30 pts.wt. on an activated carbon having 10 to 100Å pore diameter and 0.25 to 1.1cc/g pore volume, and the activated carbon material holds 10 to 100 pts.wt. water content. The specified amt. of water preliminarily held in the activated carbon material with deposition of the agents has an effect to wet the deposited agents and an effect like a catalyst to smoothly effect the reaction of the objective material to be removed and the deposited agents. Thereby, specified adsorption and removing performance can be obtd. from the initial stage of operation without being influenced by the humidity of the air to be purified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adsorbent for removing malodorous components and pollutant components in the air, and more particularly to an adsorbent made of an impregnated activated carbon material having a chemical adsorption function.

[0002]

2. Description of the Related Art Ordinary activated carbon has a large specific surface area and many adsorption sites are hydrophobic (non-polar) and therefore have a low adsorption affinity for water vapor, so that a small amount of non-polar components present in the air can be efficiently treated. Can be removed by adsorption. On the other hand, since the adsorption affinity for acidic substances, basic substances and polar substances is small, the amount of generation is increasing with changes in lifestyles, sophistication of industry, and complexity, such as ammonia, trimethylamine, hydrogen sulfide, and methyl. It has a drawback that polar molecules such as mercaptan cannot be effectively adsorbed and removed.

Therefore, in order to compensate for such drawbacks,
A technique for soaking an acidic substance or a basic substance on the surface of activated carbon (so-called impregnated activated carbon material) has been developed. According to this technology, the ability to adsorb acidic substances, basic substances and polar molecules is improved, so even a filter using ordinary charcoal can efficiently adsorb and remove a small amount of ammonia, etc. mixed in the air. it can.

By the way, in such an impregnated activated carbon material, the component to be removed in the air to be purified undergoes a chemical reaction with the chemical adhering to the surface of the activated carbon to change into an odorless or harmless substance, or the activated carbon. It is considered that since it changes to a substance that can be adsorbed at a large number of non-polar sites on the surface, the ability to adsorb and remove acidic substances, basic substances and polar molecules increases.

[0005]

However, when the present inventors examined the performance of a conventional air purifying filter using an impregnated activated carbon material, the performance of the filter largely fluctuated depending on the use environment, and it was not always expected. I learned that there is a problem that performance is not exhibited. For example, in the purification of exhaust air from a draft chamber or a clean bench, the air purification in a low-humidity clean room, or the purification of indoor air in the severe cold season, sufficient effects cannot be obtained, and the air purification operation is started. In the initial stage (hereinafter referred to as initial performance) of about 4 hours or less,
In some cases, it showed only an extremely small adsorption / removal effect.

The present invention has been made in order to solve the above problems in the impregnated activated carbon material filter, and is an air purifier which has excellent initial performance and can always exhibit a predetermined adsorption removal performance without being affected by the use environment. It is an object of the present invention to provide an adsorbent for use and a method for producing such an adsorbent.

[0007]

The invention of claim 1 has a pore diameter of 10 to 100 Å and a pore volume of 0.25 to 1.1 cc.
One of an acidic substance, a basic substance, an oxidizing agent, or an oxidizing agent and an acidic substance or a basic substance per 1 g of activated carbon.
An adsorbent mainly composed of an impregnated activated carbon material, which is impregnated with 30 to 30 parts by weight of the adsorbed activated carbon material.
It is an air-purifying adsorbent that retains 100 parts by weight of water.

The invention of claim 2 is characterized in that the adsorbent for air purification according to claim 1 is stored in a hermetically sealed state.

According to the invention of claim 3, the pore diameter is 10 to 100.
1 to 30 weight of any one of an acidic substance, a basic substance, an oxidizing agent, or an oxidizing agent and an acidic substance or a basic substance in activated carbon having a pore volume of 0.25 to 1.1 cc / g in Å An adsorbent mainly composed of an impregnated activated carbon material, which is partly impregnated, characterized in that the adsorbent is hermetically stored together with water.

According to the invention of claim 4, the pore diameter is 10 to 100.
1 to 30 weight of any one of an acidic substance, a basic substance and an oxidizing agent, or an oxidizing agent and an acidic substance or a basic substance to the activated carbon material having a pore volume of 0.25 to 1.1 cc / g in Å A method for producing an adsorbent for air purification, comprising: a step of producing an impregnated activated carbon material for adhering a part thereof; and a step of adsorbing moisture to the impregnated activated carbon material in an amount of 10 to 100 parts by weight.

According to a fifth aspect of the present invention, in the method for producing an impregnated activated carbonaceous adsorbent according to the fourth aspect, the water adsorption step comprises:
The relative humidity of the adsorbent mainly composed of the impregnated activated carbon material is 40
It is characterized in that it is placed in an atmosphere of ˜85% to adsorb moisture to the impregnated activated carbon material.

According to a sixth aspect of the present invention, in the method for producing an adsorbent for purifying air according to the fourth aspect, the water adsorption step comprises:
It is characterized in that an adsorbent containing an impregnated activated carbon material as a main constituent is housed together with water in a closed container so that the adsorbed activated carbon material adsorbs moisture.

Here, it is essential that the activated carbon material used in the present invention has a pore diameter of 10Å to 100Å and a pore volume of 0.25 cc / g to 1.1 cc / g. This is because if the pore diameter is less than 10Å, it is difficult to manufacture, and if the pore diameter is too small, the adhesive agent may block the pores.
This is because if it exceeds 00Å, the specific surface area becomes too small and the adsorption efficiency deteriorates. The pore volume is 0.25 cc / g
This is because if the amount is less than this, a sufficient amount of the drug cannot be retained, while it is difficult to produce an activated carbon material having a pore volume of more than 1.1 cc / g.

In the present invention, it is essential that the amount of the adhesive agent is 1 to 30 parts by weight with respect to the activated carbon material. This is because if the amount of the impregnated drug is less than 1 part by weight, the amount of the drug is too small to exert sufficient adsorption / removal ability for acidic substances, basic substances and polar molecules. Three
This is because if the amount exceeds 0 part by weight, the pores of the activated carbon material will be blocked by the adhering chemical, making it difficult for the substance to be adsorbed to enter.

Further, in the present invention, it is essential that the water content of the impregnated activated carbon material is 10 to 100 parts by weight with respect to the impregnated activated carbon material. When the water content is less than 10 parts by weight, the adhesive agent is not sufficiently wetted, and the amount of free water is small, so that a sufficient reaction promoting effect cannot be obtained. On the other hand, when the water content exceeds 10% by weight, excess water flows out from the adsorbent as described above, which causes corrosion of the filter frame or the like and contaminates purified air.

Further, such an adsorbent for air purification of the present invention is preferably prepared by a method of adsorbing water after the impregnated activated carbon material is prepared and then placed in a humidity atmosphere having a relative humidity of 40 to 85%. Good. According to this production method, the amount of moisture absorbed by the impregnated activated carbon material can be easily controlled, and water can be evenly distributed to the vicinity of the reaction site of the impregnated activated carbon material. On the other hand, as is clear from FIG. 1, when the relative humidity is less than 40%, the impregnated activated carbon material cannot retain sufficient moisture,
When the relative humidity exceeds 5%, it becomes difficult to control the amount of water retained with respect to the impregnated activated carbon material, and moisture (excess water) that is unnecessary for improving performance is retained. This excess water flows out together with the attached chemicals when the filter is used (during purification operation), which causes corrosion of the filter frame and contamination of purified air, which is not preferable.

The air purification adsorbent according to the present invention is not limited to the one produced by the above method. For example, it may be prepared by a method of spraying a predetermined amount of water on the impregnated activated carbon material, or may be prepared by immersing the activated carbon material in a solution in which the impregnated chemical is dissolved, and then drying it until a predetermined water content is reached. May be. Furthermore,
A method may also be used in which a predetermined amount of water and the impregnated activated carbon material that have been calculated in advance are placed in a closed container and the water content defined in the present invention is absorbed during the distribution process.

[0018]

The function and effect of the present invention will be described in comparison with the conventional impregnated activated carbon material.

The conventional impregnated activated carbon filter of this type impregnated with an acidic substance or a basic substance has been commercialized in a sufficiently dried state. The reason for this is that if the presence of water is allowed, this water will be adsorbed on the adsorption site of activated carbon, reducing the adsorption power for the target substance to be adsorbed. Is more difficult to handle, and moreover,
In order to accurately know the amount of the attached drug, it is considered that it is better to dry sufficiently because of the quality control requirements such as the convenience of removing the solvent (eg water) of the attached drug. It is due to the fact.

However, the present inventors have conducted various studies on this type of conventional filter without being bound by the above-mentioned conventional common sense. As a result, a means for positively adding water to the filter is contrary to the conventional common sense. It was found that the drawback of the conventional filter, that is, the fluctuation of the air purification performance, can be overcome. The present invention has been completed based on this finding. Hereinafter, the function and effect of the present invention will be described in detail.

In the conventional filter (impregnated activated carbon material in a dry state), as shown in FIG. 2, the substance to be removed (gas component) that has entered the pores of the activated carbon is a solid substance scattered in the pores. It will be adsorbed on the shaped drug particles and will undergo a chemical reaction with the drug to change its physical properties.However, since the solid drug has almost no molecular motion, the reaction speed is slow, and the diffusion speed within the drug particles is high. Due to the slowness, only the particle surface can participate in the reaction. In other words, the reaction between the target substance for removal and the impregnating agent does not proceed smoothly and efficiently, so that sufficient adsorption and removal performance cannot be exhibited.

Also in this case, if the air to be purified has a high humidity, the humidity of the air to be purified acts to promote the reaction, and the adhering chemicals are gradually wetted by the humidity of the air to be purified, so that the adsorption and removal performance is improved. Gradually improves. However, normal humidity (30 to 7
(About 0%), it takes a considerable time until the impregnating chemical gets wet with the humidity of the air to be purified. For this reason, in the conventional filter, the adsorption removal performance (initial performance) at the initial stage of operation is significantly reduced even in the air to be purified having a sufficient humidity. Furthermore, when the air to be purified is dry (50% or less), almost no adsorption removal performance can be exhibited (see FIG. 1 and Table 2).

By the way, in the conventional filter, when the relative humidity of the air to be purified is 60% (approximate to the average relative humidity of the outside air in Japan), sufficient adsorption / removal performance can be obtained by 3-5. Need more than time. Furthermore, for example, in cleaning a room with a heat source such as a clean room, a clean bench, or indoor air in a severe cold season, since the degree of air drying is large, it may not be possible to perform effective cleaning not only at the beginning of operation but also after that.

On the other hand, according to the present invention, a certain amount of water, which is previously held in the activated carbon material together with the adhesive agent, wets the adhesive agent and smoothes the reaction between the substance to be removed and the adhesive agent. It acts like a catalyst. Therefore, in the adsorbent of the present invention, regardless of the humidity of the air to be purified, the desired adsorptive removal performance is exhibited from the beginning of operation, particularly when the relative humidity of the air to be purified is low and the concentration of the target substance for removal is small. Exert its ability to. In addition, since the moisture adsorbed and retained in the pores of the impregnated activated carbon material is not lost in a short time under normal operating conditions, even if the relative humidity of the air to be purified is low, a high purification performance is obtained for a long period of time. Is maintained. As a result, it is possible to obtain a remarkable effect that the acidic substance, the basic substance, and the polar molecules that are mixed in the air in a trace amount can be removed with high reliability.

Further, in the adsorbent of the present invention in which such adsorbent is stored in a sealed state, a predetermined amount of water retained in the impregnated activated carbon material is reliably retained until the time of using the filter, so that it is always high. Purification performance can be guaranteed.

The adsorbent of the present invention is mainly used as an adsorbent for acidic substances such as odorous components and pollutant components, basic substances and polar molecules mixed in living spaces and working spaces (air) in a very small amount, Especially, it is used under the condition that the dryness of the exhaust air is high. However, the use of the adsorbent of the present invention is not limited to such space and conditions, and can be widely used as an adsorbent / removal material for components mixed in the gas phase.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Activated carbon material (adsorption base material) used in the present invention
As the active carbon, various types of activated carbon such as plant-based materials such as coconut shell and wood, fossil fuel-based materials such as coal and heavy petroleum oil, and synthetic polymer such as phenol resin can be used. Further, these activated carbon materials can be used in any form such as powder, granules (including granulation), fibrous form, and further web, cloth, paper and the like. However, the subject of the present invention is to improve the adsorption characteristics of a normal activated carbon material having a large proportion of non-polar sites so as to be suitable for adsorption of polar molecules and the like. It is not rational to use an activated carbon material having a large proportion of polar sites by various treatments as an adsorption base material.

In the present invention, various kinds of acidic substances, basic substances and oxidizing agents are attached to activated carbon materials, or an activated carbon material is prepared by attaching oxidizing agents and acidic substances or oxidizing agents and basic substances. It is essential that a fixed amount of water be adsorbed and held, but here, "acidic substance", "basic substance",
Each "oxidizing agent" does not necessarily mean alone. For example, an inorganic acid and an organic acid can be combined and used as an “acidic substance”. However, it is not suitable to use it in combination with an acidic substance and a basic substance because a neutralization reaction occurs between the attached chemicals. In addition, it is not preferable to use a drug that causes a side reaction between the attached drugs even if the drugs have similar properties.

As the impregnating agent, one or more agents are generally selected according to the physical / chemical characteristics of the component to be adsorbed and removed (removal target substance). For example, the removal target substance is ammonia, trimethylamine, aniline, etc. In the case of the basic gas, the inorganic acid such as sulfuric acid and phosphoric acid, the organic acid such as fatty acids and sulfanilic acid, and the organic acid such as persimmon juice etc. are used as the impregnating agent. It In addition, the substances to be removed are sulfur dioxide, nitrogen dioxide,
In the case of an acidic gas such as acetic acid, an inorganic base such as potassium hydroxide, potassium carbonate, sodium hydroxide or sodium carbonate, or an organic compound having an amino group such as toluidine or aniline is used. Further, when the substance to be removed is a polar substance containing a sulfur compound such as hydrogen sulfide, mercaptans and sulfur dioxide, an oxidizing agent such as potassium permanganate, potassium dichromate or bromine is used.

The present invention is intended to enhance the reactivity (drug activity) between the target substance to be removed and the attached drug by retaining the water content. It is not appropriate to use a drug that decreases the drug as an adhesive drug. Examples of such an attachment agent include amines for the purpose of removing aldehydes by utilizing a Schiff base reaction. However, amines can be used as the basic impregnating agent.

The air-purifying adsorbent of the present invention can be used as a gas phase filter by using the water-retaining activated carbon material alone, or may be combined with other auxiliary materials to form a filter.
Examples of the latter include, for example, a sheet-like or cloth-like mixture of a powdered activated carbon material or fibrous activated carbon material impregnated with a drug and another fibrous material, in which a predetermined amount of water is adsorbed,
The filter according to the present invention can be exemplified by supporting the impregnated activated carbon material on a porous base material such as urethane foam and then adsorbing a predetermined amount of water. The filter according to the present invention can also be produced by a method in which the impregnated activated carbon material is supported on a water-containing porous substrate and the adsorbed activated carbon material is absorbed by the moisture of the substrate.

Further, as a product form of the filter using the air-purifying adsorbent according to the present invention, for example, an aluminum book, a moisture-proof plastic film or the like may be individually packaged or housed in a closed container. preferable. With such a product form, the filter can be prevented from being dried, so that there is no performance deterioration due to long-term storage. Further, for example, a method may be adopted in which the impregnated activated carbon material in a dry state and a moisture holding material such as a sponge holding a predetermined amount of water are put in a closed storage container (including packaging). With this method, before it reaches the user's hand (during transportation),
Since the impregnated activated carbon material absorbs the moisture of the moisture retaining material, the adsorbent according to the present invention retaining a predetermined moisture content can be configured,
The present invention can be implemented with high production efficiency, and high quality filters can always be provided to users at low cost.

[0033]

EXAMPLES The present invention will be specifically described below based on examples.

[Example 1] Felt activated carbon material (hereinafter referred to as ACF) felt (FN-100PS · 10 manufactured by Osaka Gas Chemicals Co., Ltd.) having a size of 13 cm × 13 cm was used as 2 pieces.
It is immersed in 0% phosphoric acid aqueous solution and dried.
% Phosphoric acid was impregnated. This phosphoric acid-impregnated ACF felt was placed in an atmosphere having a temperature of 25 ° C. and a relative humidity of about 60% and allowed to absorb moisture until the equilibrium adsorbed water content was reached to prepare a phosphoric acid-impregnated water retention ACF felt (X ₁ ). The water content of the phosphoric acid-impregnated water retention ACF felt is equal to the phosphoric acid-impregnated AC.
It was about 34% with respect to F, and the basis weight was 150 g / m ² .

Example 2 A phosphoric acid-impregnated AC was prepared in the same manner as in Example 1 except that the relative humidity was about 70%.
A phosphoric acid-impregnated water retention ACF felt (X ₂ ) having a water content with respect to the F felt weight of about 50% was prepared.

[Example 3] A phosphoric acid-impregnated AC was prepared in the same manner as in Example 1 except that the relative humidity was about 50%.
A phosphoric acid-impregnated water retention ACF felt (X ₃ ) having a water content with respect to F of about 10% was prepared.

Comparative Example In Example 1, a phosphoric acid-impregnated ACF felt (Y) which was only immersed in an aqueous phosphoric acid solution and dried but not placed in a humidity atmosphere was used as a comparative example. The water content of the phosphoric acid-impregnated ACF felt (Y) with respect to the phosphoric acid-impregnated ACF was 1% or less.

The ACF felt (FN-100PS · 10) used in Examples 1 to 3 and Comparative Example was
Pitch-based ACF manufactured by Adol Co., Ltd. (product name A-1
0: Nominal specific surface area 1000 m ³ / g, pore diameter 16Å,
The pore volume 0.5 cc / g), and the felt-like substrate having a basis weight 100 g / m ^2, arranged basis weight 15 g / m ² of polyester nonwoven fabric on the both surfaces as a protective material, the composite subjected to needle punching It is felt.

FIG. 1 shows water adsorption isotherms of the phosphoric acid-impregnated ACF used in Examples 1 to 3 and Comparative Example. Note that FIG. 1 also shows the water adsorption isotherms of other phosphoric acid-impregnated ACFs as a reference. In FIG. 1, a is a pitch-based ACF (trade name A-10) manufactured by Adol Co., Ltd., and b is
About 15% phosphoric acid was attached to pitch-based ACF manufactured by Adol (trade name A-15; nominal specific surface area 1500 m ³ / g, pore diameter 18 Å, pore volume 0.8 cc / g). , And c is a pitch system A manufactured by Adol Co., Ltd.
CF (trade name A-20; nominal specific surface area 2000 m ³ /
g, pore diameter 18Å, pore volume 1.1 cc / g) with about 15% phosphoric acid impregnated.

As is apparent from FIG. 1, the water adsorption isotherm characteristics differ depending on the characteristics of the activated carbon material. Further, although not shown, the water adsorption isotherm characteristics also differ depending on the type of the impregnated drug. Therefore, it is preferable to preliminarily prepare a moisture adsorption isotherm for each impregnated activated carbon material and set the conditions (relative humidity and moisture absorption treatment time) for retaining a predetermined amount of moisture based on this data. Good.

[Performance Test] In the following, the X prepared above is used.
_The adsorption / removal performance for ammonia of each filter was investigated using _{1 to} X ₃ and Y, and the results will be described.

In Test 1, the air to be purified in which 70 ± 5 μm / m ³ of ammonia was mixed in the air of relative humidity of 20% and 60%, and the concentration of ammonia after purification was measured with time. The adsorption removal performance for odorous components in the low concentration region was investigated. Also, in test 2,
The relative humidity of the air was set to 20%, and the air to be purified containing a higher concentration of ammonia (about 10 times) than that in Test 1 was used, and 10% of each filter was tested in the same manner as in Test 1.
The breakthrough time was measured.

Table 1 shows the test conditions, and Tables 2 and 3 and FIG. 1 show the results of tests 1, 2, and 3, respectively. The relative humidity of the air to be purified was adjusted by a method of dehumidifying or humidifying. The water content of each filter was calculated from the amount of weight loss when the filter was sufficiently dried.

[0044]

[Table 1]

As is clear from Table 2 below, with the filter X _{1 of the} present invention made of the impregnated activated carbon material that holds approximately 34% of water, the temperature is high immediately after the start of purification (at the beginning of operation) regardless of the humidity of the air to be purified. The purification performance was demonstrated, and the high purification performance was maintained until 14 days after the relative humidity of the air to be purified was 20%.

On the other hand, in the case of the comparative filter Y (conventional filter) having a water content of 1% or less, when the relative humidity of the air to be purified is 20%, not only at the beginning of operation but also after that, no purification effect is obtained. I was not able to admit. On the other hand,
When the relative humidity was set to 60%, the purification performance was gradually improved with the lapse of the operation time, and became equivalent to that of the filter X ₁ of the present invention at the time when 2 days had passed since the start of the operation. However, the initial performance was significantly inferior to that of the filter X ₁ of the invention.

Furthermore, from the results of the 10% breakthrough test (Table 3) in which the concentration of ammonia in the air to be purified is 10 times or more that of Test 1, the filters (X _{1 to} X ₃ ) according to the present invention are shown.
Was confirmed to have a significantly higher 10% breakthrough time than the comparative filter (Y). From these test results, it was demonstrated that the present invention can adsorb and remove odorous components and the like for a long period of time.

When the relative humidity of the air to be purified is high, the filter performance is improved because the filter absorbs moisture due to the humidity in the air to be purified and conditions similar to those of the filter of the present invention are formed. Yes, the water content improves the adsorption performance of the filter because the water present around the phosphoric acid mediates the adsorption of NH _{3 on} the phosphoric acid, and the water neutralizes the phosphoric acid molecule to facilitate movement. It is considered that the reaction proceeds smoothly.

[Other Matters] The phosphoric acid-impregnated water-retaining ACF felt (X ₁ ) prepared in Example 1 was packaged with a moisture-proof film, left for 2 months in the room, and then subjected to the same conditions as in Test 1. When the adsorption removal performance with respect to ammonia was examined by the method of Example 1,
The result similar to the result in was obtained. In addition, the phosphoric acid-impregnated ACF felt (Y) according to the comparative example and 1 / of the phosphoric acid-impregnated ACF felt (Y)
A hygroscopic material containing 2 parts by weight of water was placed in a bag made of a hygroscopic film and hermetically sealed, and the bag was left indoors for 2 weeks. Then, the phosphate-impregnated ACF felt was taken out and the water content was measured. As a result, the water content of phosphoric acid impregnated ACF felt is about 30%.
When the 10% breakthrough time was measured for the phosphoric acid-impregnated ACF felt under the same conditions as in Test 2, the same result as that of the filter X _{1 according} to Example 1 was obtained.

[Table 2]

[0050]

[Table 3]

[0051]

As is clear from the above results, according to the present invention, there is provided an adsorbent for air purification, which is excellent in adsorption performance of the impregnated activated carbon material for acidic gas, basic gas and polar gas components, particularly initial performance. it can. Further, according to the production method of the present invention in which the moisture absorption treatment is performed under a predetermined relative humidity, it is possible to stably produce a high-performance and highly-reliable air purifying filter with almost no increase in cost.

[Brief description of drawings]

FIG. 1 is a reference diagram showing moisture isotherm adsorption lines of various impregnated activated carbon materials (fibrous activated carbon materials).

FIG. 2 is an explanatory diagram schematically showing the relationship between a substance to be removed and an attached drug.

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[Procedure amendment]

[Submission date] March 29, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

Here, it is essential that the activated carbon material used in the present invention has a pore diameter of 10Å to 100Å and a pore volume of 0.25 cc / g to 1.1 cc / g. This is because if the pore diameter is less than 10Å, it is difficult to manufacture, and if the pore diameter is too small, the adhesive agent may block the pores.
Exceeding Å, specific surface area is because the adsorption efficiency becomes too small deteriorate. The pore volume is 0.25 cc / g
While a is not able to hold a sufficient amount of drug less than, the pore volume is a 1.1 cc / g because it is difficult to manufacture ultra El activated carbon material.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

In the present invention, it is essential that the amount of the adhesive agent is 1 to 30 parts by weight with respect to the activated carbon material. When impregnated drug content is less than 1 part by weight, the acidic material to the drug amount is too small, a good to difficulty exhibits sufficient adsorption removal ability with respect to a basic substance and polar molecules, while the drug amount Three
This is because if the amount exceeds 0 part by weight, the pores of the activated carbon material will be blocked by the adhering chemical, making it difficult for the substance to be adsorbed to enter.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

Further, in the present invention, it is essential that the water content of the impregnated activated carbon material is 10 to 100 parts by weight with respect to the impregnated activated carbon material. When the water content is less than 10 parts by weight, the adhesive agent is not sufficiently wetted, and the amount of free water is small, so that a sufficient reaction promoting effect cannot be obtained. On the other hand, when the water content exceeds 100 % by weight, excess water flows out from the adsorbent as described above, which causes corrosion of the filter frame or the like and contamination of purified air.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

In the present invention, activated carbon contains various acidic substances,
A basic substance, an oxidant is impregnated, or an impregnated activated carbon material obtained by impregnating an oxidant and an acidic substance, or an oxidant and a basic substance is required to adsorb and retain a predetermined amount of water. "Acidic substance", "basic substance" here
Each "oxidizing agent" does not necessarily mean alone. For example, an inorganic acid and an organic acid can be combined and used as an “acidic substance”. However, it is not suitable to use it in combination with an acidic substance and a basic substance because a neutralization reaction occurs between the attached chemicals. In addition, it is not preferable to use a drug that causes a side reaction between the attached drugs even if the drugs have similar properties.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction contents]

[0044]

[Table 1]

[Procedure correction 6]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment]

[Submission date] July 11, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of drawings]

FIG. 1 is a diagram showing moisture isotherm adsorption lines of various impregnated activated carbon materials (fibrous activated carbon materials).

FIG. 2 is an explanatory diagram schematically showing the relationship between a substance to be removed and an attached drug.

Claims (6)

[Claims] 1. An activated carbon having a pore diameter of 10 to 100 Å and a pore volume of 0.25 to 1.1 cc / g, one of an acidic substance, a basic substance and an oxidizing agent, or an oxidizing agent and an acidic substance. An adsorbent containing, as a main constituent, an adsorbed activated carbon material obtained by impregnating 1 to 30 parts by weight of a substance or a basic substance, wherein 10 to 100 parts by weight of water is retained with respect to the attached activated carbon material. Adsorbent for air purification characterized by 2. The air purification adsorbent according to claim 1, which is stored in a sealed state. 3. Activated carbon having a pore diameter of 10 to 100 Å and a pore volume of 0.25 to 1.1 cc / g, any one of an acidic substance, a basic substance and an oxidizing agent, or an oxidizing agent and an acidic substance. An adsorbent for air purification, which is an adsorbent mainly composed of an impregnated activated carbon material obtained by impregnating 1 to 30 parts by weight of a substance or a basic substance, wherein the adsorbent is hermetically stored together with water. 4. An activated carbon material having a pore diameter of 10 to 100 liters and a pore volume of 0.25 to 1.1 cc / g, an acidic substance,
Any one of a basic substance, an oxidizing agent, or an oxidizing agent and an acidic substance or a basic substance are attached to 1 to 30 parts by weight of an attached activated carbon material producing step, and water is added to the attached activated carbon material. A method for producing an adsorbent for air purification, comprising: a moisture adsorbing step of adsorbing 10 to 100 parts by weight. 5. The moisture adsorbing step is characterized in that an adsorbent having an impregnated activated carbon material as a main constituent is placed in an atmosphere having a relative humidity of 40 to 85% to adsorb moisture to the impregnated activated carbon material. The method for producing the adsorbent for purifying air according to claim 4. 6. The moisture adsorbing step is characterized in that an adsorbent having an impregnated activated carbon material as a main constituent is housed together with moisture in a closed container to adsorb moisture to the impregnated activated carbon material. 4. The method for producing an adsorbent for air purification according to 4.