JPH02115020A - Removing agent for lower aldehyde - Google Patents

Abstract

PURPOSE:To remove lower aldehydes rapidly and efficiently by preparing the removing agent by mixing with at least either aromatic amino acid or its salt as an effective component or by depositing the aforesaid effective component on a porous carrier. CONSTITUTION:A removing agent for lower aldehydes is prepared by mixing at least either aromatic amino acid or its salt as an effective component. In this embodiment, although the aromatic amino acid or its salt can be used in as-powdered state, in order to enhance its effect, it may be brought into an aqueous solution of optional concentration or the solution dissolved in an organic solvent or deposited on a porous carrier. Industrially, the aromatic amino acid, its salt and the porous carrier are mixed together by a mixer and pulverized by a crusher after drying for preparation of a powdery or granular removing agent.

Description

[Detailed description of the invention] [Industrial application field 1 The present invention relates to an agent for removing lower aldehydes.

Specifically, the present invention relates to a removing agent effective for purifying odorous gases mainly containing lower aldehydes such as formaldehyde and acetaldehyde.

Lower grades such as formaldehyde and acetaldehyde? Rudehydes are harmful gases with a distinctive pungent odor. In particular, acetaldehyde is listed as one of the eight R odor substances, and its odor can be felt even when it is present in the air at a very low concentration of 5 ppm. Another 5ppmPi!
When the temperature reaches 11 degrees, it is highly irritating to the eyes and throat, and prolonged contact can cause inflammation, which is not good for health.

The sources of these lower aldehydes include factories that manufacture lower aldehydes and their derivatives, factories that use lower aldehydes, such as polyacetal resin manufacturing and molding factories, and adhesives that use lower aldehydes (
During the manufacture and use of phenolic adhesives, especially in plywood manufacturing factories and in the living environment, they are emitted from cigarette smoke, the human body, human waste, refrigerators, and exhaust gases from automobiles.

In the factories mentioned above, lower aldehydes are generated at relatively high concentrations, but in the living environment they are generated at relatively low concentrations of several ppm or less.

[Conventional Technology J] Conventionally, in factories where 1lIIlf is high, a method using a catalyst in which platinum group elements, copper group elements, lanthanide elements, or actinide elements are supported on a carrier such as alumina has been used to remove such lower aldehydes. Are known. For removal in the living environment, methods of adsorption and removal using activated carbon, silica gel, etc. are used.

However, in the former method of removal using a catalyst,
The catalyst is expensive, and the temperature at which catalytic oxidation occurs is as high as 200°C or higher, making it inconvenient to handle. The latter method of adsorption removal using activated carbon, silica gel, etc. in the living environment attempts to remove lower aldehydes by physically adsorbing them within the pore structure of the adsorbent. In this case, depending on the type of adsorbent, it may not be possible to adsorb lower aldehydes at all, and even if it can be adsorbed, there is a limit to the ability of the adsorbent, and if it reaches a saturated adsorption state, it will not be able to adsorb lower aldehydes, and vice versa. may be released into the surrounding air and not be removed. Another method is to remove it by reacting it with aldehyde using chemicals. For example, salts such as phenylhydrazine and 2,4-dinitrophenylhydrazine are substances widely used for collecting and quantifying lower aldehydes, and in particular, 2,4-dinitrophenylhydrazine hydrochloride is acetaldehyde as defined in the Offensive Odor Prevention Act. It is used to measure acetaldehyde in the air and is very effective in chemically removing acetaldehyde from the air, but it dissolves in strong acids such as 1 acid and sulfuric acid. However, its use as a general removal agent is restricted.

Other aromatic amines, which have traditionally been used as substances that react with lower aldehydes, have concerns about their effects on the human body, such as being cancer-causing substances, and the odor of these substances makes them unsuitable for use in living spaces. , which is undesirable because it may cause a feeling of disgust to the human body.

JP-A-60-129054@ discloses a sharp odor deodorant containing amino acids and their salts as active ingredients. This is intended for application in the food field, and the targeted odors are basic odors such as ammonia and trimethylamine, and sulfide odors such as hydrogen sulfide and methyl mercaptan. It is mainly used as an addition to food, diluting it with organic solvents, water, etc.

[Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances, and has a rapid and excellent removal effect on lower aldehydes, is odorless, and has a physical adsorption effect similar to activated carbon. It is an object of the present invention to provide a lower aldehyde remover which does not reach a saturated adsorption state in a relatively small amount and which does not cause adverse effects on the human body.

[Means for Solving the Problems] The lower aldehyde removing agent of the present invention contains at least one persimmon of an aromatic amino acid and a salt of an aromatic amino acid as an active ingredient.

Active ingredients include aromatic amino acids and salts of aromatic amino acids such as o-1m-p-aminobenzoic acid, p-aminomethane, m-aminosalicylic acid, and their respective aromatic amino acids. Examples include metal salts such as sodium salts and potassium salts, and inorganic salts such as sulfur M 1m, nitrates, and hydrochlorides. can be used as a powder, but to enhance its effectiveness, it can be dissolved in an aqueous or organic solvent of any concentration, or supported on a porous carrier.

Examples of porous carriers include inorganic porous carriers such as sepiolite, palygorskite, activated carbon, zeolite, activated carbon fiber, Seviolite mixed paper, silica gel, activated clay, alumina, vermiculite, and diatomaceous materials, as well as pulp, fibers, cloth, and polymers. Organic porous carriers such as porous bodies can be used.

Its shape may be sheet-like, honeycomb-like, powder-like, granular, granular, or root-like.

The porous carrier itself has a small ability to adsorb lower aldehydes, but when the aromatic amino acids are supported, the ability to remove lower aldehydes is improved. In particular, when aromatic amino acids are supported on sepiolyte 1~, palygorskite, activated carbon, or zeolite, the ability to remove lower aldehydes is significantly improved.

The method of supporting the aromatic amino acid or its salts on the porous carrier is not particularly limited, but preferably the aromatic amino acid or its salts are pulverized and mixed into a porous fine powder and then molded. Alternatively, it may be supported by dissolving it in a soluble solvent such as water or ethanol, impregnating the porous carrier with the solution, and then evaporating the solvent.

In addition, as a method for industrially producing this lower aldehyde remover, for example, aromatic amino acids and their salts and a porous carrier are mixed using a Henschel mixer, kneader, kneader, disper mill, etc. do. After drying, it can be pulverized with a pulverizer such as a Henschel mixer or a hammer mill to form a powder or granular removal agent.

The remover can also be shaped into a shape suitable for the intended use. For example, the above powder is kneaded with water, extruded with an extruder, and dried as is;
Or cut it at regular intervals and form it into cylindrical tablets,
Alternatively, it may be made into spheres using a marmerizer or extruded into a honeycomb shape.

Furthermore, in order to impart strength to the above-mentioned removing agent, an organic binder such as polyvinyl alcohol or CMC, or an inorganic binder such as silica gel or diatomaceous material may be added and molded.

The amount of n3 that supports aromatic amino acids and their salts on the porous carrier is preferably in the range of 1.0 to 90% by weight based on the carrier. If the supported weight is less than 1.0% by weight, the effect of removing lower aldehydes will be small, and 904'! If it exceeds 50%, the dispersibility into the carrier will be poor, and the removal of lower aldehydes will also be poor, making it uneconomical.Among these, it is more preferable to support the carrier at 5 to 80%.

[Operations and Effects of the Invention] The present invention uses an aromatic amino acid and its salts as an active ingredient of a lower al i' hominoid remover.

This aromatic amino acid and its salts can remove lower aldehydes. Then, it can be supported on an aqueous solution or a porous carrier to form a removing agent. especially,
When supported on a porous carrier, lower aldehydes can be removed extremely efficiently. It is thought that when supported on a porous carrier, the contact area between the aromatic amino acid and the lower aldehyde is increased, thereby increasing the adsorption capacity, but this is not the only effect.

The mechanism of this action has not been clearly understood, but when aromatic amino acids are supported on a porous carrier, the conjugation system at the molecular level changes, and the electrons of the carboxyl group and amino group become localized. It is thought that the presence of aldehyde promotes the reaction between the amino group and the aldehyde group. Moreover, since the removal performance differs depending on the type of porous carrier, it is not only based on an increase in the contact area.

In addition, even if odorous gases are adsorbed, the porous IH1 body carrying aromatic amino acids can remove gases other than aldehydes without reducing the adsorption performance of V8. For example, activated carbon adsorbs odorous gaseous substances such as hydrocarbons and sulfides, and Seviolite adsorbs odorous gaseous substances such as ammoninono, isokichihe TM, acetic acid, trimethylamine, and pyridine.

[Example] This will be explained in detail below using Examples.

Example 1 〇-1m Weigh 1 g each of p-aminobenzoic acid and p-aminosalicylic acid into each beaker, and add Seviolite 9Q to each beaker (stir).Additionally, add ethyl alcohol to each beaker. 2QmJ of was added and mixed by stirring for about 5 minutes using an ultrasonic cleaner.Next, the mouth of each beaker was opened with a vinylidene chloride film and heated at 70°C for about 30 minutes.Then, the vinylidene chloride film was removed, and each The mixture was dried by heating at 100° C. and ground in a mortar to produce four types of powdered lower aldehyde removers No. 1, 2, 3, and 4.

Furthermore, 1-lium 0-aminobenzoate 19 was weighed into a beaker, 9q of Seviolite was added thereto, and the mixture was stirred well. Next, 40 mA of deionized water was added, and the mixture was stirred and mixed using an ultrasonic cleaner for about 5 minutes.

Next, close the mouth of the beaker with vinylidene chloride film7.
Heated at 0°C for about 30 minutes. Thereafter, the vinylidene chloride film was removed, dried by heating at 100° C., and ground in a mortar to produce powdered lower aldehyde removing agent N015.

The evaluation of each of the five types of lower aldehyde removers obtained in #J was carried out by sealing the remover and a certain amount of acetaldehyde together with air in a gas-impermeable bag with a capacity of 5 fJ, and then removing the remaining aldehyde after a predetermined period of time. Measured and compared. Lower aldehyde removing agents (No. 1 to 5) were each weighed at 0.29 m (the content of aromatic amino acids was 20 m9) and placed in a gas-impermeable bag with a capacity of 5 p. Into this bag, 10 μm of acetaldehyde aqueous solution prepared by diluting 1 ml of 7 acetaldehyde solution with 9 μ of water was vaporized with Dry 17-, sealed with 5 g of air, and left at room temperature for 4 hours. was measured using a gas chromatograph.

Measurement conditions for the gas chromatograph are shown in section 1k. In addition,
The concentration of acetaldehyde was determined by first determining a calibration curve using a cylinder standard gas of acetaldehyde at 39.91) pm, and from this calibration curve.

Residual acetaldehyde degree, removal rate, lower acetaldehyde
Table 1 (blank below) Table 2 shows the amount of aldehyde adsorbed by the aldehyde remover. The removal rate was calculated using the following formula.

Removal rate - ((blank concentration) - (residual concentration using a remover)) / (blank concentration) The blank concentration is the residual concentration when the same treatment is carried out without using a remover.146.Oppα1 It is.

As a comparative example, 01.5 of No. 5, which uses only Shibiolite as a porous carrier without using aromatic amino acids. Only coconut shell activated carbon 0
As No. 2, an acetaldehyde removal test was conducted in the same manner as in Nos. 1 to 5. The results are shown in Table 2.

No. 1 to 4 aromatic amino acids have an acetaldehyde removal rate of 90% or more, F, and absorbency of 6 mg/g or more, around 50% of Comparative Examples 01 to C2 and 3 mq/g.
It is layered compared to after 9m.

The removal rate for the sodium salt of N025 is slightly lower71
．． Although the removal rate was 9%, it still showed a removal rate of 1.5 times that of the comparative example.

Example 2 In this example, the types of porous 10 bodies were changed.As the porous bodies, 9g each of palygorskite, coconut shell activated carbon, and zeolite 13X were weighed in a beaker, and 19g of 0-aminobenzoic acid was added and stirred. Mixed. 20 ml of ethyl alcohol was added thereto, stirred and mixed using an ultrasonic cleaner for about 5 minutes, and then the beaker was closed with a vinylidene chloride film and heated at 70° C. for 30 minutes. After that, the solvent was removed and pulverized in the same manner as in Example 1.
Removers N006-8 were prepared.

0.2 g of each of removers No. 6 to 8 (of which the weight of amino acids is 20 m) was weighed and placed in a gas-impermeable bag of 5 p volume ffl. Thereafter, an aldehyde removal performance test was conducted in the same manner as in Example 1. The results are shown in Table 3. In this case, the horizontal polishing of the blank was 4255 ppm. In the comparative example, only the porous carrier used in this example was placed in a bag.
I gave it a rating of ~5.

As a result, the porous carriers carrying 0-aminobenzoic acid (Nos. 6 to 8) had better removal performance than C3 to 5, which were only porous carriers. In particular, No. 6, in which 0-aminoamine j,it i a was supported on palygorskite, had a removal rate of 94%.
, the adsorption amount was as high as 10.9 mg/g.

Example 3 0-Aminobean ff1M and 35 milled in advance in a mortar
The porous carrier that had passed through a 0 mesh sieve was mixed with sepiolyte (- indicates the mixing ratio shown in Table 4).

Each of these mixtures was placed in a beaker, and 3 (1'3ω) of Seviolite ethyl alcohol was added to each.

Next, open the beaker with vinylidene chloride film,
It was heated in a dryer at 70°C for 30 minutes. Thereafter, the vinylidene chloride film was removed and dried at 100°C to produce removed NJ Nos. 9 to 21.

J3 This removal agent was re-pulverized and used before the aldehyde removal test. As a comparative example, a product containing only Levi A light was designated as C6.

0.2 g of each of these removed N1 was weighed out and placed in a gas-impermeable bag with a capacity of 5 J. Thereafter, acetaldehyde and air were placed in a bag using the same IJ method as in Example 1. 4115 f
After the iiff, the acetaldehyde content in the bag was measured using a gas chromatograph to determine the removal rate and adsorption amount. The results are shown in Table 5.

Note that the measurement conditions of the gas chromatograph were the same as in Example 1. The blank was made under similar conditions without using any remover, so the concentration of ace1-aldehyde was 1781)1. ) m
Met.

As a result, in No. 9, in which the supported amount of 0-aminobenzoic acid was 0.1% by weight or less, the removal rate was lower than in Comparative Example 06. Furthermore, even with N0121, which has a supported amount of 95% by weight, the removal rate is lower than that of comparative IA 06, and the supported amount of aromatic amino acids is 1. O・
It shows that the range of 90% to 90% is effective. In particular, NO, 12 to 1 aromatic amino acid has 5 to 11
The removal rate of lower aldehydes is 90% in the 80% by weight range.
The above is more effective.

Example 4 0-Aminobenzoic acid 19 was weighed and suspended in a beaker, 9q of Seviolite was added, and the mixture was stirred well. Next, add 20mJl of ethyl alcohol, seal it, and use an ultrasonic cleaner to clean it for about 50 minutes.
The mixture was stirred for a minute, heated in a dryer at 70° C. for about 30 minutes, opened, and dried at 100° C. to prepare remover No. 22.

This lower aldehyde remover is shown in FIG.

Fill the deodorizing column 1 of the repeat test device, and test at? I-
The conditions under which the removal performance of lower aluminum hydroxides deteriorates were investigated by passing air containing aldehydes through the column. This trial #
i! The device consists of an air supply pipe 5 in which a circulation pump 7 and an odor substance vaporizer 3 are disposed in a container 2 having a capacity of 25.11 mm, and a leak-proof air supply pipe 5 in which a circulation pump 6, a flow meter, and a deodorizing column 1 are disposed in the middle. The container 2 and the deodorizing column 1 are kept at a constant temperature in a constant temperature bath. The table air is constantly sent to the deq column 1 via the circulation pump 6 to circulate the lower aldehydes in the container 2, thereby maintaining an equilibrium adsorption state. The number of removing agents in the deodorizing column 1 is 3. The test conditions were: gas flow Jii: 50j/mtn, pressure'
The air inside the container 2 was circulated under the following conditions: 1J loss: 18 mm H2O, temperature = 25 ± 1°C, deodorizing column = 30 x 30 x 240 mm, and filling length: 8 mm.

First, an aqueous solution of acetaldehyde diluted approximately 10 times was poured into the odorant vaporizer 3, air was circulated for 20 minutes, and then an acetaldehyde aqueous solution was injected from the odorant vaporizer 3 again. This test was repeated 10 times. At this time, the injection amount was 20 μm for the 1st to 8th injections, and 40 μm for the 9th and 10th injections. Moreover, the concentration of acetaldehyde was measured by gas chromatography 0.1.3.5.10.15.205) after injection. The measurement conditions of the gas chromatograph were the same as in Example 1. The results are shown in Table 6.

The results show that Shitakebiolite supporting 0-aminobenzoic acid adsorbs aldehydes with little deterioration in adsorption performance and is durable.

Actual Flow Example 5 Five types of removing agents No. 23 to No. 27 were prepared by the method described below. In No. 23, Seviolite 99 and 0-aminobenzoic acid 19 were each finely ground and mixed. No. 24 is 0-amine benzoin Fl! 1 g was dissolved in 20 mj of ethyl alcohol, 9 g of Seviolite was added to this solution, and Biolite was impregnated with the 0-aminobenzoic acid-ethyl alcohol solution. Next, this was placed in a dryer and dried at 100°C. No. 25 was obtained by dissolving 1 g of 0-aminobenz tzM in a mixed solvent of 15 mg of ethyl alcohol and 5 mg of water, and adding Sevioly [·99] to this solution for impregnation. Next, it was dried in a dryer at 100°C. No. 26 is
1 g of 0-aminobenzoic acid and 9 g of Seviolite were combined,
2QmN of ethyl alcohol was added. This was stirred for about 5 minutes using an ultrasonic cleaner, then sealed and heated at 70° C. for about 30 minutes. The package was then opened and dried in a dryer at 100°C. No. 27 is 0-aminoan 0 incense! Mix 19 with 9g of Seviolite and add 15mj of ethyl alcohol.
), and a mixed solution of 15 mJl of water was added. This mixed solution was stirred in an ultrasonic cleaner for about 5 minutes, tightly sealed, and heated to 70°C.
It was heated for about 30 minutes. Then open it and dry it in a dryer for 100%
Dry at °C.

The ability of this remover to absorb and remove lower aldehydes was tested as follows. Sample (No. 23-2
Weigh out 0.2 g of each of 7) and Seviolite (062CI (C7) as a comparative example, put it in a gas-impermeable bag with a capacity of 5 g, and add 0.2 g of Al l-aldehyde (10
10 μρ of the diluted aqueous solution was added while vaporizing. After about 4 hours, the removability was rated as UP. In this case, the blank's a degree is 125 ppm. The results are shown in Table 7. As a result, even if the method of supporting O-aminobenzoic acid on Seviolite is changed, the removal performance is not affected.

In this example, the porous phase material Seviolite and coconut shell activated carbon were compared. No. 28 was obtained by dissolving 1Q of 0-aminobenzoic acid in 2Qmjl of nibble alcohol, adding 9 g of Seviolite to this solution, impregnating it, and drying at 100°C. No. 29 dissolves 〇-aminobenzoin M1q in 20mp of ethyl alcohol, and adds 99% of coconut shell activated carbon to this solution.
g was added and impregnated, and then dried at 100°C. 0.2a of each of these removers was applied and placed in a gas-impermeable bag with a capacity of 51 (hereinafter referred to as the margin). In this way, seven bags and seven blank bags were made for each sample.

Next, Table 8 shows acetaldehyde aqueous solutions diluted approximately 10 times so that these bags differ by 11 degrees! The concentration of acetaldehyde was measured using a gas chromatograph after leaving it for about 4 hours, and the concentration of acetaldehyde adsorption in the sample was determined.

The measurement conditions of the gas chromatograph were the same as in Example 1. The results are shown in Table 8. Further, the density of the blank, G, is shown in Table 9.

From the adsorption equilibrium diagram obtained in this way, it is clear that using Sevioly l- as a carrier is better than using coconut shell activated carbon.
? The amount of I-aldehyde adsorbed is large and the removability is poor.

Example 7 0-Aminobenzoic acid 19 was mixed with 20 m
j! 9q of heseviolite was added thereto to impregnate the solution, dried at 100° C., and ground in a mortar to obtain a remover.

Weigh out 0.29 g of this remover, put it in a gas-impermeable bag with a capacity of 5 J, add 50 μg of formaldehyde aqueous solution diluted 10 times, and leave it for about 4 hours. Measured by gas detection fee.

This result is shown in Table 10 as No. 30.

Similarly, acetaldehyde and n-butyraldehyde were also investigated. For acetaldehyde, 10 μg of an aqueous solution diluted approximately 10 times, and for n-butyraldehyde, approximately 1
018 diluted aqueous solution was added, and the residual concentration was measured using a gas chromatograph. These are No. 3
1. It is shown in Table 10 as No. 32.

As a comparative amount, 0.29 of Seviolite was placed in a 5 g capacity 1H gas-impermeable bag, and formaldehyde, acetaldehyde, and n-butyraldehyde were added in the same manner as in this example, and the residual concentration was measured using a gas chromatograph. (C8, C9, Cl0). The results are shown in Table 10.

The concentration of the blank is 129pp of formaldehyde.
m, acetaldehyde is 113 ppm, and Sn-butyraldehyde is +5 ippm.The gas chromatograph measurement conditions are the same as in Example 1.The removal agent of this example shows a F removal rate of 97% or more.

In particular, formaldehyde and n-butyraldehyde have a 100%
% removal rate is shown. It says that the removal rate is 94.0% and the adsorption capacity is 10.5 for C10 Rutaki 9.01, but the corresponding No.
32 is 0110096.11.1 and sucks M
m has further improved.

Example E3 0->' 10 g of aminobenzoin was weighed into a beaker, and 90Q of ethyl alcohol was added to prepare an ethyl alcohol solution with 0 aminobenzoin content. Next, activated carbon fiber sheet <manufactured by Osaka Gas Co., Ltd., product name: fibrous activated carbon ACF A-10, 23, 6 x 23.6 cm x 0.3
mm) uniformly impregnated with the above ethyl alcohol solution.
Then, the impregnated activated carbon fiber sheet was heated and dried in a drier at 100° C. for 16 hours to remove ethyl alcohol and obtain a lower aldehyde remover. The loading m of O-aminozoic acid was 5% by weight.

An aldehyde removal performance test was conducted as follows. The sheet was cut into 5 mm square pieces, 2.5 g of the cut pieces were weighed, and packed into the deodorizing column of the apparatus shown in FIG. 1 of Example 4.
80 μp of an acetaldehyde aqueous solution diluted approximately 10 times was introduced from the odorant vaporizer 3 and vaporized. Next, the first
Air in the stomach was circulated under the experimental conditions shown in the figure. At this time, the gas in the container 2 was sampled with a microsyringe from the gas sampling port over time, and the concentration of acetaldehyde in the container was measured using a gas chromatograph. The gas chromatograph conditions were the same as in Example 1.

The results are shown in diagram A in FIG.

As a comparative example, the same acetaldehyde removal performance test as in the above-mentioned example was also conducted using activated carbon fibers that did not support any 0-aminobenzoic acid. Results (line diagram 8 shown in conjunction with Figure 2). Compared to the comparative example, this example shows that 11rg1 of acetaldehyde decreases with increasing @.

Example 9 Paper (21.8 cm x 21.8 cm x o, 13
A sample containing 5% by weight of O-aminobenzoic acid was prepared in exactly the same manner as in Test Example 1, except that 5% by weight of O-aminobenzoic acid was used.

The Al-1 human removal performance test was conducted in exactly the same manner as in Test Example 1. The results are shown in diagram 0 of FIG.

As a comparison, the same test was also carried out using paper that did not support any 0-aminobenzoic acid.

The results are marked U1 in FIG. 3 (diagram D). The paper made from this green bio-lyte pulp exhibits excellent removal performance, with the concentration of acetaldehyde decreasing significantly over time.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the test device for repeated adsorption and removal of the example;
FIG. 2 is a diagram showing the concentration change over time of ace1 to aldehyde in Example 8, and FIG. 3 is a diagram showing the change in a degree over time of acetaldehyde in Example 9. 1...1 Pleasure odor column 3...Odor substance vaporization jl 4. 6.7...Circulation pump 2...Container 5...Air supply vibrator Patent applicant Toyota Central Research Institute Co., Ltd. Agent
Patent Attorney Hiroshi Okawa Figure 2 Figure 1 Shogaku Fff Darkness (min) Figure 3

Claims (6)

[Claims] (1) A lower aldehyde remover containing at least one of an aromatic amino acid and a salt of an aromatic amino acid as an active ingredient. (2) The aromatic amino acid and the aromatic amino acid salts include at least one selected from o-, m-, or p-aminobenzoic acid, p-aminosalicylic acid, and salts thereof. Remover for lower aldehydes. (3) A lower aldehyde remover comprising at least one of aromatic amino acids and aromatic amino acid salts supported on a porous carrier as an active ingredient. (4) The lower aldehyde remover according to claim 3, wherein the porous carrier comprises at least one selected from seviolite, palygorskite, activated carbon, and zeolite. (5) The porous carrier can be sheet-like, honeycomb-like, granular-like,
The lower aldehyde removing agent according to claim 3, which comprises at least one type selected from powder, granule, plate, and fibrous form. (6) The aromatic amino acid and the aromatic amino acid salts are at least one selected from o-, m-, or p-aminobenzoic acid, p-aminosalicylic acid, and salts thereof. Remover for lower aldehydes.