JP2002159852A - Active carbon fiber for removing malodorous gas and air cleaning sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an active carbon fiber for removing malodorous gases which has a high capacity of removing lower aldehydes and basic gases and a high rate of removing such gases and to provide an air cleaning sheet using the same. SOLUTION: There is provided an active carbon fiber carrying an aromatic amino acid salt and phosphoric acid, wherein the amount of the aromatic amino acid salt carried is 7-30 mass %, the amount of the phosphoric acid carried is such that the ratio of the number of moles of the phosphoric acid carried to the number of moles of the aromatic amino acid salt carried is 0.05-1.0, and the specific surface area of the active carbon fiber carrying them is 300-1,000 m2/g.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a basic aldehyde such as acetaldehyde or formaldehyde generated from furniture, building materials, etc., which is present in an indoor space or a space inside a vehicle, particularly from a tobacco smell. The present invention relates to an activated carbon fiber for removing odorous gas, which can efficiently remove gas, and an air purification sheet containing the activated carbon fiber as a main component.

[0002]

2. Description of the Related Art Conventionally, removal of acetaldehyde has been a major issue in purifying air containing tobacco smoke and the like. For the purpose of removing acetaldehyde, a lower aldehyde removing material in which an organic amine compound or the like is attached to a porous body is known, and Japanese Patent Publication No. Sho 60-5409 is known.
No. 5 and JP-A-7-80292 disclose activated carbon to which aniline, toluidine, or the like is attached as an amine compound. However, these amine compounds are inherently powerful drugs, and are not preferable in terms of safety and hygiene when used for air purification in a space where people are present, and have not exhibited a satisfactory removal effect.

In addition, Japanese Patent Publication No. 60-54095 proposes a remover for lower aldehydes in which an aromatic amino acid or a salt of an aromatic amino acid is supported on a porous carrier such as sepiolite or activated carbon. However, although these removing agents have the ability to remove lower aldehydes, they have the drawback that they have little effect on removing basic substances such as ammonia contained in cigarette smoke.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and has a large removal amount of lower aldehydes and basic gas.
Another object of the present invention is to provide an activated carbon fiber for removing odorous gas having a high removal rate and an air purification sheet containing the activated carbon fiber as a main component.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above-mentioned object, and as a result, activated carbon fibers carrying a specific agent in a specific amount have been prepared from lower aldehydes and basic gas. The inventors have found that the removal amount is large and the removal rate is high, and the present invention has been reached. That is, the present invention has the following configuration as its gist. (1) In an activated carbon fiber carrying a salt of an aromatic amino acid and phosphoric acid, the amount of the salt of the aromatic amino acid is 7 to 30% by mass, and the amount of phosphoric acid is phosphorus relative to the number of moles of the salt of the aromatic amino acid. The molar ratio of the acid is an amount that becomes 0.05 to 1.0, and the specific surface area of the activated carbon fiber after loading is 300 to 10
Activated carbon fiber for removing odorous gas, characterized by having a water content of 00 m ² / g. (2) A sheet comprising the activated carbon fiber and the heat-fusible fiber according to the above (1) as main components, and maintaining a predetermined form by fusing or softening the heat-fusible fiber, wherein the sheet (1) An air purification sheet, wherein the content of the activated carbon fiber described in the above is 40% by mass or more.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The activated carbon fiber for removing offensive odor gas of the present invention has activated carbon fiber as a base material and carries a salt of an aromatic amino acid and phosphoric acid. Activated carbon fibers have a larger outer surface area and a larger specific surface area than ordinary granular activated carbon, so that the efficiency of contact with gas components existing in the space is high and the adsorption speed can be increased.

In the present invention, the activated carbon fiber is loaded with an aromatic amino acid salt and phosphoric acid to provide the ability to remove lower aldehydes and basic gases. The amount is 7 to 30% by mass (7 to 30% by mass of the entire activated carbon fiber for removing malodorous gas carrying an aromatic amino acid salt and phosphoric acid), and the amount of phosphoric acid is phosphorus relative to the number of moles of the aromatic amino acid salt. The molar ratio of the acid is 0.
It is necessary that the amount is in the range of 0.5 to 1.0.

The aromatic amino acids include o-aminobenzoic acid, m-aminobenzoic acid, p-aminobenzoic acid, aminoacetanilide, aminosalicylic acid and the like. For example, p-aminobenzoic acid has its amino group and lower aldehyde. The dehydration reaction forms a Schiff base to immobilize the lower aldehyde, but it is chemically unstable and highly reactive, so it is easily decomposed. The amount of removal of the class decreases.

In order to stabilize this reaction and increase the removal amount of lower aldehydes, it has been found that it is effective to use a salt, preferably an acidic salt, and furthermore, the presence of phosphoric acid has a catalytic effect. The dehydration / condensation reaction proceeds, and a trace amount of lower aldehydes contained in the air can be completely removed.

In order to convert an aromatic amino acid into an acidic salt, a common acid such as nitric acid, sulfuric acid, hydrochloric acid or phosphoric acid can be used, but the acid to be carried and the acid to acidify the aromatic amino acid are the same. Since acid is preferred, nitric acid and sulfuric acid have a large damage to activated carbon fiber, and hydrochloric acid has high volatility. Therefore, phosphoric acid is suitable as an acid to be used. Those carrying a phosphate and phosphoric acid of an aromatic amino acid are most preferred.

In the present invention, a sufficient amount of lower aldehyde can be removed by controlling the amount of the salt of the aromatic amino acid to be 7 to 30% by mass.
２５25% by mass. When the amount of the aromatic amino acid salt is less than 7% by mass, the removal amount of the lower aldehyde is small.
When the amount is more than 0% by mass, the ratio of the number of moles of the salt of the aromatic amino acid to the number of moles of the phosphoric acid is 0.05 to 1.
Since phosphoric acid must be supported so as to be 0, the specific surface area after the support is too small, and the adsorption power of the activated carbon fiber is weakened, so that the removal amount of the lower aldehyde is reduced and the removal rate is also reduced. .

Further, the amount of phosphoric acid supported is preferably such that the ratio of the number of moles of phosphoric acid to the number of moles of the salt of the aromatic amino acid is 0.05 to 0.05.
It is necessary that the amount is 1.0, and if the amount of phosphoric acid is too large relative to the amount of the salt of the aromatic amino acid carried,
The function as a catalyst is lost, and the removal amount of lower aldehydes decreases. There is an appropriate quantitative relationship between the amount of the aromatic amino acid salt and the amount of phosphoric acid carried, and the amount of phosphoric acid is converted into the number of moles, and the number of moles of the aromatic amino acid salt and the number of moles of phosphoric acid are converted. Unless the ratio of numbers is in the range of 0.05 to 1.0, preferably 0.1 to 0.8, the removal amount and removal rate of lower aldehydes cannot be kept high. The ratio mentioned here is the number of moles of phosphoric acid when the number of moles of the salt of the aromatic amino acid is 1 and the calculation formula is (moles of phosphoric acid) / (moles of the salt of the aromatic amino acid). .

Further, the specific surface area of the activated carbon fiber after supporting the salt of aromatic amino acid and phosphoric acid is also very important. The lower aldehydes are removed by the reaction of the salt of the aromatic amino acid with the lower aldehyde.Before that, the activated carbon fiber adsorbs the lower aldehyde, and the salt of the aromatic amino acid in the pores of the activated carbon fiber is removed. If it is not guided to the point, the reaction with the salt of the aromatic amino acid does not occur. Carrying such that the pores of the activated carbon fibers are buried may not only reduce the removal amount and removal rate of the lower aldehydes, but may even make it impossible to remove them at all.

[0014] Therefore, in the present invention, a specific surface area of 300~1000m ² / g, the activated carbon fiber after carrying preferably required to be 350~800m ² / g. When the specific surface area is less than 300 m ² / g, the adsorption of lower aldehydes by activated carbon fibers becomes difficult, and
If it exceeds m ² / g, it is difficult to satisfy the amount of salt of aromatic amino acid or phosphoric acid supported.

In order to increase the removal amount of lower aldehydes,
It is possible to some extent if the amount of the acidic salt of the aromatic amino acid is increased, but no matter how high the amount of removal, it is not practical unless the removal rate is high for use as an air purification sheet. In the present invention, activated carbon fibers having a high specific surface area are used to increase the removal rate, and by increasing the specific surface area after loading, the fast physical adsorption ability of the activated carbon fibers is preserved as it is, and the pores of the activated carbon fibers are reduced. The lower aldehydes are quickly led to the salt of the aromatic amino acid present therein, and the reaction rate is increased by supporting the salt of the aromatic amino acid and phosphoric acid in the above-described ratio, and the removal rate of the lower aldehydes such as acetaldehyde is extremely increased. It is possible to be faster. In addition, since phosphoric acid is also supported, it is possible to remove not only lower aldehydes such as acetaldehyde but also complex odors containing a basic gas such as ammonia. Yes, it is a very excellent odor gas remover. Further, since the activated carbon fiber after loading has a specific surface area of 300 to 1000 m ² / g, it has a sufficient physical adsorption capacity and a high adsorption amount of gas such as acetic acid, which is generally called tobacco smell. It is possible to remove all of the three components of the odor components, acetaldehyde, ammonia and acetic acid, using only the activated carbon fiber for removing odorous gas and the air purification sheet of the present invention.

The amount of the salt of the aromatic amino acid and the amount of the phosphoric acid carried on the activated carbon fiber can be measured by organic element analysis. That is, by carrying out organic elemental analysis of the supported activated carbon fiber itself, nitrogen and phosphorus present in the activated carbon fiber are quantified, and the amount of aromatic amino acid is determined from the ratio of nitrogen, and the amount of phosphoric acid is determined from the ratio of phosphorus. By carrying out the calculations, the respective supported amounts are obtained.

Next, an example of a method for producing the activated carbon fiber for removing offensive odor gas of the present invention will be described. As described above, the specific surface area of the activated carbon fiber after carrying salt and phosphoric acid in an aromatic amino acid in order to 300~1000m ² / g, the specific surface area is supported above the activated carbon fiber 700 meters ² / g Is preferred. Activated carbon fiber before loading has a specific surface area of 700 m ²
/ G, the specific surface area after loading is 300 m ² / g.
In order to achieve the above, the supported amount becomes too small, and the removal amount and removal rate of lower aldehydes decrease.

In the present invention, depending on the specific surface area of the activated carbon fibers, as the specific surface area after carrying the 300~1000m ² / g remain, preferably an aromatic amino acid to remain a specific surface area of 350~800m ² / g Is supported by selecting from 7 to 30% by mass of a salt of phosphoric acid, and phosphoric acid is further carried in such an amount that the ratio of the number of moles of the salt of the aromatic amino acid to the number of moles of the phosphoric acid is 0.05 to 1.0. Thus, the activated carbon fiber for removing offensive odor gas of the present invention, which shows a very excellent removal rate and a large removal amount for lower aldehydes, can be obtained.

Also, acidic salts of aromatic amino acids such as p
-Addition of p-aminobenzoic acid to a phosphoric acid solution causes phosphorylation and dissolution of the aminobenzoic acid in the phosphoric acid solution. And precipitated as a crystal of p-aminobenzoic acid phosphate, and can be taken out. The precipitated p-aminobenzoic acid phosphate is dissolved in water, and the activated carbon fiber is immersed and adsorbed in the aqueous solution to support the p-aminobenzoic acid phosphate. Further, if phosphoric acid is supported on the activated carbon fiber by showering or the like in accordance with the amount of the supported carbon, the activated carbon fiber for removing offensive odor gas of the present invention can be obtained.

When dissolving p-aminobenzoic acid in a phosphoric acid solution, a mixed solution of phosphoric acid salt of p-aminobenzoic acid and phosphoric acid can be prepared by making phosphoric acid excessive. At this time, if the ratio of p-aminobenzoic acid and phosphoric acid is adjusted, if the activated carbon fiber is immersed in this solution, p-aminobenzoic acid phosphate and phosphoric acid can be supported at the same time.

Next, the air purification sheet of the present invention will be described. The air purifying sheet of the present invention comprises, as main components, the above-mentioned activated carbon fiber for removing malodorous gas carrying the salt of the aromatic amino acid and phosphoric acid and the heat-fusible fiber, and the heat-fusible fiber is fused or softened. A sheet having a predetermined form, wherein the content of the activated carbon fibers accounts for 40% by mass or more. In order to use as an air purifying sheet, the amount of activated carbon fiber in the air purifying sheet is 40% by mass or more, preferably from the viewpoint of the air volume of an indoor air purifier, an in-vehicle air purifier or the like, and the contact efficiency between gas and activated carbon fiber. If it is not more than 50% by mass, both the removal amount and the removal rate decrease. Similarly, the basis weight of the air purification sheet is preferably 60 g / m ² or more from the viewpoint of the removal amount and the removal rate.

The heat fusible fibers constituting the air purification sheet of the present invention together with the activated carbon fibers can adhere the activated carbon fibers which are in contact with each other only at the contact points by melt fusion or softening of the polymer. The configuration of the heat-fusible fiber may be any of a single component and a composite fiber composed of a plurality of components,
In the case of a core-sheath composite fiber in which a low-melting polymer is disposed in the sheath component and a high-melting polymer is disposed in the core component, the sheath component bonds the fibers by heat fusion, but the core component is heated by the applied heat. It is one of the fibers constituting the air purifying sheet because it does not deteriorate or become irregular, and is particularly preferable because it improves the mechanical performance of the sheet.Other bicomponent composite fibers are also preferable for the same reason. It is.

The polymer used for the heat-fusible fiber is preferably a polyamide-based, polyester-based, or polyolefin-based polymer from the viewpoints of fiber-forming properties, heat-fusing properties, and chemical resistance. Is nylon 6, nylon 46,
Polyester polymers such as polyamide 66 such as nylon 66, polyethylene terephthalate, polybutylene terephthalate, polyethylene terephthalate copolymerized with isophthalic acid, and polylactic acid; and polyolefin-based polymers such as polyethylene and polypropylene. Coalesce, and blends of these polymers, and those comprising copolymers of these polymers are also included, as long as the effects of the present invention are not impaired, matting agents, pigments, flame retardants, defoamers Optional additives such as an antistatic agent, an antioxidant, and an ultraviolet absorber may be added.

The air purifying sheet of the present invention is mainly composed of the activated carbon fiber for removing odorous gas and the heat fusible fiber as described above, but only the activated carbon fiber for removing odorous gas and the heat fusible fiber. Or other fibers or pulp may be contained as long as the effects of the present invention are not impaired.

Next, an example of a method for producing the air purification sheet of the present invention will be described. First, the activated carbon fiber for removing odorous gas and the heat-fusible fiber are mixed at a predetermined weight ratio, and then a non-woven fabric composed of the activated carbon fiber and the heat-fusible fiber using a card machine such as a random card or a parallel card. Form the web.
At this time, a method of cross-lapping the non-woven web with a cross wrapper or the like according to the basis weight and mechanically generating three-dimensional entanglement of the fibers with a needle punch device to form an integrated non-woven web is also adopted. Can be.

The thus formed non-woven web of activated carbon fibers is passed through a dryer set at a temperature equal to or higher than the melting point or softening point of the heat-fusible fiber and lower than (melting point or softening point +40) ° C. By doing so, an inter-fiber fixation between the activated carbon fiber and the heat-fusible fiber is caused by heat fusion or softening to form a sheet, thereby obtaining an intended air purification sheet. At that time, the thickness of the sheet can be adjusted with a calender roll.

When the air purification sheet thus obtained is used for air purification, a dust removing effect can be imparted by laminating an electretized nonwoven fabric sheet or the like. And a filter suitable for an air purifier or the like that combines the above.
In addition, the filter shape can be a corrugated shape in which a flat sheet and a corrugated sheet are alternately overlapped, a shape in which the sheet is folded in a pleated shape, or a shape in which the sheet is simply used as a flat plate, to effectively act as a filter. Can be.

[0028]

Next, the present invention will be described in detail with reference to examples. Note that the present invention is not limited by these examples. In addition, each physical property value in an Example was measured by the following method. (1) Acetaldehyde adsorption amount per unit weight The sample was allowed to stand in a Tedlar bag having an acetaldehyde concentration of 100 ppm and a gas volume of 3 L for 24 hours, and the acetaldehyde concentration after 24 hours was measured, and the acetaldehyde adsorption per unit weight was determined from the measured value. The amount was determined. (2) Acetaldehyde adsorption rate The gas in the Tedlar bag having an acetaldehyde concentration of 20 ppm and a gas volume of 20 L was passed through a glass column containing a sample at a gas flow rate of 7 L / min using a pump, and the gas that came out was again Tedlar bag. The inside of the container was circulated and the acetaldehyde decay concentration was measured, and the amount of acetaldehyde adsorbed per unit time was determined from the measured value. In the above (1) and (2), the acetaldehyde concentration is
Measurements were made using a Yanaco G3810 gas chromatography equipped with a FID gas detector. (3) Ammonia adsorption amount per unit weight The sample was allowed to stand for 24 hours in a Tedlar bag having an ammonia concentration of 100 ppm and a gas capacity of 3 L, and the ammonia concentration after 24 hours was measured. From the measured value, the ammonia adsorption amount per unit weight was measured. I asked. (4) Ammonia adsorption rate The gas in the Tedlar bag having an ammonia concentration of 20 ppm and a gas capacity of 20 L was passed through the glass column containing the sample at a gas flow rate of 7 L / min using a pump, and the gas that came out was again Tedlar bag. Circulation ventilation was performed to return the inside of the chamber, and the attenuation concentration of ammonia was measured, and the ammonia adsorption amount per unit time was determined from the measured value. Above (3) (4)
In, the gas concentration of ammonia was measured with a Kitagawa gas detector tube. (5) Specific surface area Using a Cantersorb Auto Six automatic gas adsorption apparatus, the relative pressure was determined by the BET multipoint method using a low-temperature nitrogen adsorption method.
3 was measured.

Example 1 Activated carbon fibers having a specific surface area of 1200 m ² / g were provided with p-aminobenzoic acid phosphate and phosphoric acid, p-aminobenzoic acid phosphate at 13.4% by mass, and phosphoric acid as p-amino acid. For the removal of malodorous gas, the activated carbon fiber was supported by an immersion method with a bath ratio of 1:50 in an amount of 0.74 in molar ratio with benzoic acid phosphate, and the specific surface area of the supported carbon fiber was 800 m ² / g. Activated carbon fiber (sample) was produced. Using this sample, acetaldehyde adsorption amount per unit weight, acetaldehyde adsorption rate,
The amount of ammonia adsorbed per unit weight and the adsorption rate of ammonia were measured.

Example 2 The supported amount of p-aminobenzoic acid phosphate was set to 20% by mass, and the supported amount of phosphoric acid was set to 0.16 in molar ratio of p-aminobenzoic acid phosphate. Samples were prepared in the same manner as in Example 1 except that the specific surface area of the activated carbon fiber was 700 m ² / g, and the physical properties were measured.

Example 3 Using activated carbon fiber having a specific surface area of 800 m ² / g, the loading of p-aminobenzoic acid phosphate was 14.5% by mass, and the loading of phosphoric acid was p-aminobenzoic acid phosphate. And the physical properties were measured in the same manner as in Example 1 except that the molar ratio was 0.21 and the specific surface area of the activated carbon fiber after loading was 350 m ² / g.

Example 4 Using activated carbon fibers having a specific surface area of 1700 m ² / g, the amount of p-aminobenzoic acid phosphate supported was 25.0% by mass, and the amount of phosphoric acid supported was p-aminobenzoic acid phosphate. A sample was prepared in the same manner as in Example 1 except that the molar ratio was 0.22, and the specific surface area of the activated carbon fiber after loading was 850 m ² / g, and the physical properties were measured.

Example 5 Activated carbon fibers having a specific surface area of 1200 m ² / g were mixed with p-aminobenzoic acid phosphate and phosphoric acid, p-aminobenzoic acid phosphate at 13.4% by mass, and phosphoric acid as p-amino acid. An amount of 0.74 in terms of mole ratio with respect to benzoic acid phosphate was carried by an immersion method to prepare activated carbon fiber A for removing odorous gas having a specific surface area of 800 m ² / g after carrying. Next, the activated carbon fiber A for removing malodorous gas obtained above and the core-sheath composite fiber B whose core component is made of polyethylene terephthalate and whose sheath component is made of isophthalic acid copolymerized polyester (melting point 110 ° C.) are mass-processed using a parallel card. After forming a nonwoven web having a ratio (A: B) of 70:30, the nonwoven web was cross-wrapped by a cross wrapper, and mechanically three-dimensionally entangled with a needle punch device to be integrated. Created a non-woven web. Further, the nonwoven web is passed through a dryer at a temperature of (melting point of the sheath component + 30) ° C., and the activated carbon fiber and the heat-fusible fiber are fixed to each other by heat-sealing. and air purifying sheet m ^2,
The physical properties of this sheet were measured. Table 1 shows the results obtained in Examples 1 to 5.

Comparative Example 1 The same activated carbon fiber as in Example 1 was used, and p-aminobenzoic acid was loaded in a similar manner to an amount of 10% by mass by an immersion method. The activated carbon fiber after loading had a specific surface area of 800 m ^2. / G sample was prepared, and each physical property value was measured.

Comparative Example 2 The amount of p-aminobenzoic acid phosphate carried was 40% by mass, and the amount of phosphoric acid carried was 1.2 in terms of molar ratio with p-aminobenzoic acid phosphate. A sample was prepared in the same manner as in Example 1 except that the specific surface area of the activated carbon fiber after loading was 200 m ² / g, and each physical property value was measured.

Comparative Example 3 The supported amount of p-aminobenzoic acid phosphate was 10% by mass, and the supported amount of phosphoric acid was 2.5 such that the molar ratio with respect to p-aminobenzoic acid phosphate was 2.5. Samples were prepared in the same manner as in Example 1, except that the specific surface area of the activated carbon fiber after loading was 400 m ² / g, and the physical properties were measured.

Comparative Example 4 A commercially available granular activated carbon having a specific surface area of 400 m ² / g was used.
The supported amount of p-aminobenzoic acid phosphate was 10% by mass, and the supported amount of phosphoric acid was 0.8 such that the molar ratio with respect to p-aminobenzoic acid phosphate was 0.8. A sample was prepared in the same manner as in Example 1 except that the surface area was changed to 100 m ² / g, and each physical property value was measured.

Comparative Example 5 Using activated carbon fiber having a specific surface area of 1700 m ² / g, the loading amount of p-aminobenzoic acid phosphate was 25.0% by mass, and the loading amount of phosphoric acid was p-aminobenzoic acid phosphate. A sample was prepared and the physical properties were measured in the same manner as in Example 1 except that the molar ratio with respect to the amount was 0.01, and the specific surface area of the activated carbon fiber after loading was 850 m ² / g. . Table 2 shows the results obtained in Comparative Examples 1 to 5.

[0039]

[Table 1]

[0040]

[Table 2]

As is clear from Tables 1 and 2, Examples 1 to
The activated carbon fiber for removing odor gas and the air purification sheet obtained in 5 had a high adsorption amount of both acetaldehyde and ammonia, a high adsorption speed, and were excellent as a material for removing odor gas. On the other hand, those of Comparative Examples 1 to 5 have high adsorption amounts of both acetaldehyde and ammonia, and none of them have a high adsorption speed, and are used as materials for removing malodorous gas containing lower aldehydes and basic gas. It was inferior.

Example 6 Using the air purification sheet of Example 5, the acetic acid adsorption capacity was evaluated. The measurement was performed with an acetic acid concentration of 100 ppm and a gas volume of 3 L.
The sample was allowed to stand for 24 hours in a Tedlar bag, and the acetic acid concentration after 24 hours was measured with a Kitagawa gas detector tube, and the acetic acid adsorption amount per unit weight was determined from the measured value. The adsorption speed was such that the gas in the Tedlar bag having an acetic acid concentration of 50 ppm and a gas capacity of 20 L was passed through a glass column containing a sample at a gas flow rate of 7 L / min using a pump, and the gas that had come out was once again placed in the Tedlar bag. The circulating aeration was carried out, and the decay concentration of acetic acid was measured, and the acetic acid adsorption amount per unit time was determined from the measured value. The obtained results are shown in Table 3, and showed that the acetic acid had good adsorption capacity and adsorption speed.

[0043]

[Table 3]

[0044]

The activated carbon fiber for removing offensive odor gas of the present invention comprises:
The removal amount of malodorous gas, especially lower aldehydes such as acetaldehyde and basic gas such as ammonia are both high,
In addition, the removal speed is high. As described above, the lower aldehydes and the basic gas, both of which are offensive odor, can be removed by a single material, so that the air purification sheet of the present invention containing this activated carbon fiber as a main component can be used indoors or in vehicles. ,
The air purifier is suitable as a filter in almost all fields.

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[Procedure amendment]

[Submission date] March 12, 2001 (2001.3.1.
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

Further, Japanese Patent Publication No. 4-39368 discloses that
A remover for lower aldehydes in which an aromatic amino acid or a salt of an aromatic amino acid is supported on a porous carrier such as sepiolite or activated carbon has been proposed. However, although these removing agents have the ability to remove lower aldehydes, they have the drawback that they have little effect on removing basic substances such as ammonia contained in cigarette smoke.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction contents]

[0044]

The activated carbon fiber for removing offensive odor gas of the present invention comprises:
The removal amount of the odorous gas, particularly the lower aldehydes such as acetaldehyde, the basic gas such as ammonia, and the acetic acid are all high, and the removal rate is high. Thus, lower aldehydes and basic gas and
Since the three odor components of acetic acid can be removed, the air purification sheet of the present invention containing this activated carbon fiber as a main component is suitable as a filter in almost all fields of air purifiers regardless of whether it is for indoor use or vehicle use. It is.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B01D 53/04 B01D 53/04 A D06M 13/342 D06M 13/342 // D06M 101: 40 101: 40 ( 72) Inventor Kana Tokunaga 23 Uji Kozakura, Uji City, Kyoto Prefecture, Unitika Central Research Laboratory (72) Inventor Keiichi Asami 23 Uji Kozakura Uji City, Kyoto Prefecture Unitika Central Research Laboratory F term 4C080 AA05 CC12 HH09 JJ05 JJ06 MM01 MM05 MM18 NN05 4D012 BA03 CA09 CA10 CB03 CE03 CG03 CG04 4G066 AA05B AA05C AA50B AA50D AB27B AB27D AC23C BA03 BA16 BA26 CA02 CA29 CA52 DA03 FA12 FA37 4L033 AA09 DA

Claims (2)

[Claims] 1. In an activated carbon fiber carrying an aromatic amino acid salt and phosphoric acid, the amount of the aromatic amino acid salt carried is 7 to 30% by mass, and the amount of phosphoric acid carried is the number of moles of the aromatic amino acid salt. The molar ratio of phosphoric acid to 0.05 to 1.
And the specific surface area of the activated carbon fiber after loading is 3
Activated carbon fiber for removing odorous gas, characterized by having a molecular weight of from 00 to 1000 m ² / g. 2. A sheet comprising the activated carbon fiber and the heat-fusible fiber according to claim 1 as main components, and maintaining a predetermined shape by fusing or softening the heat-fusible fiber. An air purification sheet, wherein the content of activated carbon fibers is 40% by mass or more.