JPH09313583A - Deodorant and deodorizing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the deodorizing performance against an acidic salt of a basic substance and basic gas, by composing a deodorant by attaching an acid having Hammett acidity function negatively larger than a specific value to a substrate. SOLUTION: This deodorant is formed by attaching an acid having Hammett acidity function negatively larger than -4.4 to a substrate. As this acid, nonvolatile or low volatile one is used. This acid is chemically combined with a functional group on the substrate surface. As a substrate to be used for this deodorant, inorganic or organic porous material is used and is made so that the acid is filled in the pores. Also fine particles and a gel material are used other than a porous material. For instance, a deodorant is formed by attaching sulfuric acid having -11.9 of Hammett acidity function to activated carbon as the substrate. This deodorant is brought into contact with gas containing an acid salt of a basic substance to remove the acid salt of the basic substance in the gas.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a deodorizing material and a deodorizing method, and more particularly to a deodorizing material and a deodorizing method capable of removing a low-concentration level malodor generated in a living space or the like.

[0002]

2. Description of the Related Art Conventionally, various odors have been deodorized by being adsorbed on an adsorbent. As the adsorbent, activated carbon, zeolite, ion exchange resin, etc. were used. Usually, odorous gas often coexists with moisture. Furthermore, the bad odor that becomes a problem in living spaces such as indoors is
In many cases, various components coexist in a very low concentration of ppm or ppb order.

Therefore, as the adsorbent, conventionally, a hydrophobic adsorbent such as activated carbon is often used rather than a hydrophilic adsorbent such as silica gel, activated alumina, synthetic zeolite and the like. At this time, activated carbon alone cannot selectively adsorb and remove all odorous components, and the removal rate and removal capacity may be insufficient.

Therefore, it has been proposed to support various chemicals on the adsorbent to improve the adsorption performance. For example, in Japanese Patent Laid-Open No. 59-151963, the amount of activated carbon is 10
A deodorizer for refrigerators is disclosed which comprises ˜20% by weight of citric acid or an adsorbing and carrying amount of the acid alkali metal salt in an amount equal to or less than 0.5 equivalent amount of the carried amount. This deodorant is
It utilizes the neutralization reaction of acids and bases, and is said to exert a deodorizing effect on malodors containing basic gases such as ammonia and amines.

[0005]

[Problems to be Solved] However, in a closed living space such as a residence, an office, or a car, a basic gas is often generated not only by the basic gas but also by mixed with an acidic gas or a neutralizing gas. Further, the basic gas often exists as a salt by reacting with the acidic gas such as neutralization or addition.

Alternatively, when gas is generated from various constituent materials, a basic gas comes into contact with a material containing an acidic substance,
The deoxidation reaction produces a salt of a basic substance in the gas. In addition, the acidic gas may come into contact with the material containing the basic substance to generate a salt of the basic substance in the gas. It cannot be said that the above-mentioned deodorant is still sufficiently effective in removing such salts. Further, the deodorizing material is not sufficient in deodorizing performance even for basic gas.

In view of such conventional problems, the present invention intends to provide a deodorizing material and a deodorizing method having an excellent deodorizing performance against an acid salt of a basic substance and a basic gas.

[0008]

The invention of claim 1 is a deodorizing material, characterized in that an acid having a Hammett acidity function larger than -4.4 is attached to a base material.

The Hammett's acidity function is a measure of the proton donating degree of an acid to a base or a solvent medium, and the catalytic activity and reaction activity of Bronsted acid can be quantitatively considered. The Hammett acidity function is a measurement of the acidity function of an acid in an aqueous solution using a nitroaniline-based neutral base. The acidity function in the aqueous solution is negatively large as the concentration of the strong acid is high.

The above acid has a Hammett acidity function negatively larger than-(minus) 4.4. If it is not negatively larger than -4.4, the deodorizing performance, especially the efficiency of removing the acid salt of the basic substance, may decrease. The negative upper limit of the Hammett acidity function is not particularly limited, but it is preferably −21 from the viewpoint of handleability during attachment or use.

In the deodorizing material of the present invention, an acid having a Hammett acidity function negatively larger than -4.4 is attached to the base material. Therefore, it has excellent deodorizing performance. In particular, it excels in the ability to remove basic substances and their acid salts. Therefore, excellent deodorizing performance can be exhibited in closed living spaces such as houses, offices, cars, etc. where basic acid salts are easily generated.

Here, the salt of a basic substance is a compound in which the basic substance is neutralized with an acid, an aldehyde, hydrogen sulfide and an acidic substance such as a sulfur compound such as mercaptans, sulfides and disulfides. , Or an addition compound of the above organic base and an acid.

Among the above-mentioned salts of basic substances, amine hydrochlorides such as triethylenediamine, tetramethylhexanediamine, dimethylethanolamine, methylmorpholine and dimethylaminomorpholine, acetates, various carboxylates, acetaldehyde ammonia and the like. High removal efficiency for aldehyde ammonia, ammonium chloride, etc.

The basic substance means a substance which undergoes a neutralization reaction, an addition reaction, etc. with an acid. It also refers to a Bronsted base capable of accepting a proton or a Lewis base donating an electron pair. Among the above-mentioned basic substances, it exhibits a remarkable removal performance against hydroxides of alkali metals and alkaline earth metals, ammonia having amino groups, amines, nitrogen-containing compounds such as alkaloids, and the like. Examples of amines include alkylamines such as methylamine and ethylamine, dialkylamines such as dimethylamine, diethylamine and methylethylamine, trialkylamines such as triethylamine, alkylenes such as hydrazine, methylenediamine, triethylenediamine and tetramethylhexanediamine. High removal efficiency for hydroxyalkylamines such as diamine, hydroxylamine, methanolamine, ethanolamine, diethanolamine, and dimethylethanolamine, and nitrogen-containing compounds such as methylmorpholine and dimethylaminomorpholine.

There are various contact modes between the deodorizing material of the present invention and the gas to be treated. For example, the deodorizing material can be left standing in a closed space such as indoors or in a car, and the gas to be treated can be adsorbed and removed by contacting the deodorized material with natural convection or diffusion. Further, a deodorizing material can be placed on the surface of the member where the gas to be treated is generated to improve the contact efficiency. Furthermore, if the gas to be treated is forcibly brought into contact with the deodorizing material using a fan or the like, it can be removed more effectively.

Next, as the acid having a Hammett acidity function of -4.4, there is, for example, 38% concentrated hydrochloric acid. As the acid having a Hammett acidity function negatively larger than -4.4, inorganic acids include fuming sulfuric acid, fluorosulfuric acid, sulfuric acid, nitric acid, perchloric acid, and fluorine-substituted protonic acids such as antimony pentafluoride and Lewis acids alone. Alternatively, there is a mixture of a super strong acid and an organic acid such as fluoroacetic acid. Among these acids, acids having a Hammett acidity function such as sulfuric acid and super strong acid having a negative Hammett acidity function larger than -4.4 are preferable because basic non-salt gas and basic salt gas can be strongly and quickly adsorbed and removed.

The above-mentioned acid is not particularly limited, but for example,
Bronsted acids can be used. The Bronsted acid may be either an inorganic acid or an organic acid. Examples of the inorganic acid include fuming sulfuric acid, fluorosulfuric acid, sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, phosphoric acid, boric acid, perchloric acid, fluorine-substituted protonic acids such as antimony pentafluoride, and Lewis acids, alone or in a mixture. Is used.

Examples of the organic acid include aliphatic carboxylic acids such as formic acid, citric acid, succinic acid, acetic acid, oxalic acid, fumaric acid, maleic acid, malic acid and lactic acid, benzoic acid, cinnamic acid and trimellitic acid. Aromatic carboxylic acids such as acid, phthalic acid, toluic acid, phthalonic acid, o-aminobenzenesulfonic acid, chlorobenzenesulfonic acid,
Organic sulfonic acids such as benzenesulfonic acid, abietic acid, carminic acid, cholic acid, uric acid, etc., and fluorine-substituted organic acids such as fluoroacetic acid are used. The above organic acids or inorganic acids may be used alone or in combination of two or more. Moreover, you may use it, mixing with a Lewis acid.

The amount of the acid to be added to the base material can be appropriately selected, but is more preferably 3 to 30% by weight. If it is less than 3% by weight, the deodorizing efficiency may decrease. On the other hand, if it exceeds 30% by weight, it may be difficult to impregnate the acid, and the specific surface area of the base material may decrease, so that the deodorizing efficiency may decrease.

The method of impregnating the acid to the base material is not particularly limited, but considering the use in living space, in order to suppress the re-emission of the basic substance adsorbed and removed without the volatilization of the impregnated acid. It is preferable to fix the impregnated acid on the surface of the base material. Next, as in the invention of claim 2, it is preferable that the acid is a non-volatile or low-volatile acid. This suppresses the re-release of the adsorbed basic substance. Further, it is possible to prevent volatilization of the acid itself or a reaction product with the basic substance.

As the above-mentioned non-volatile or low-volatile acid,
For example, an acid having a low vapor pressure such as sulfuric acid, phosphoric acid, boric acid, nitric acid, oxalic acid, or citric acid is used. The method for applying the non-volatile acid or the low volatility acid to the substrate is not particularly limited, but for example, a method of spraying, impregnating, dipping an acid solution, and optionally drying or firing, or a method of applying The substrate may be depressurized or vacuum degassed.

Further, for the same reason as described in claim 2,
When the acid is volatile, it is preferable that the acid is chemically bonded to the surface functional group of the substrate, as in the invention of claim 3, for example. When the acid is volatile, for example, a hydrogen bond or a charge transfer complex or an adsorption complex is formed with the surface functional group of the base material, or a fixing agent such as a polyalkylenoxide silanol derivative or a silane coupling agent. Is preferably used to chemically bond to the substrate. For the same reason as in claim 2, it is preferable that the substrate is a porous material and the pores of the substrate are filled with the acid, as in the invention of claim 4. .

When the base material has fine pores, particularly micropores having a diameter of 2 nm or less, when the acid is impregnated, for example, an acid solution is sprayed, impregnated or dipped, and if necessary, dried or calcined. In addition, it is possible to use an ordinary attachment method such as depressurizing or vacuum degassing the substrate at the time of attachment. The reason is that the intermolecular force acts three-dimensionally between the base material and the acid and strongly adsorbs. This is because micropore filling occurs and it becomes difficult for even volatile acids to volatilize.

Further, as in the invention of claim 5, it is preferable that the substrate is an inorganic or organic porous material, a fine particle material or a gel material. As a result, the contact area with the odorous component increases, the deodorizing capacity increases, and the deodorizing effect increases.

The above-mentioned porous material means a substance having pores. Various asperities are formed on the surface of the substance, but in the present invention, those in which the depth of the recess is larger than the diameter of the recess are called pores. The pores include pores having a regular structure and disordered pores. Also, the three-dimensional distribution of pores varies. For example, three-dimensional pores such as natural and synthetic zeolites, clay and clay minerals, two-dimensional layered structure such as graphite, honeycomb-like one-dimensional pores such as alumina produced by electrolytic oxidation. But is not limited to these.

Examples of the porous material include aquatic rocks such as sandstone, volcanic rocks such as pumice and volcanic ash, or modified materials thereof, clay, wood, synthetic building materials, roof tiles, building materials such as bricks, and inorganic or organic materials. Thermal insulation, natural or synthetic fibers or woven or non-woven fabrics of these, sepiolite, natural zeolite, clay minerals such as vermiculite, charcoal, activated carbon, carbon materials such as graphite, foamed resin, metal or metal oxide porous body Etc. are used.

Micropores having a pore diameter of 2 nm or less classified by IUPAC of the porous material, or the pore diameter is 2
It is preferred to have mesopores of ~ 50 nm. The above porous material may partially include macropores having a pore diameter of more than 50 nm. However, when only such macropores are used, the deodorizing effect may be insufficient because the specific surface area is low. .

The specific surface area of the porous material is 50 m ² /
g or more. This increases the specific surface area of the base material, increases the contact area with the gas containing the odorous component, and improves the deodorizing efficiency. Furthermore, since a large amount of acid can be supported, the deodorizing capacity is large and the deodorizing efficiency is high.

Examples of the inorganic porous material include natural zeolite, A type, X type, Y type, mordenite, ZSM.
Synthetic zeolite such as -5, clay minerals such as sepiolite, palygorskite, vermiculite, diatomaceous earth, anti-firestone, barite stone, cristobalite, acid clay, porous iron body, etc. are used. Further, as the organic porous material, for example, various activated carbons such as granular, fine powdery, fibrous, etc., charcoal, bone charcoal, various charcoal such as swelling graphite, porous type ion exchange resin and the like are used.

Further, the fine particle material refers to fine particles of several tens nm to several μm having no pores and secondary aggregates thereof. As such a particulate material, the specific surface area is 50 m
It is preferable to use one having a weight ratio of ² / g or more. When the specific surface area is 50 m ² / g or more, since the surface area of the base material is large, the contact area with the gas containing the odor substance is large and the deodorizing efficiency is high. Furthermore, since the amount of acid supported increases, the removal capacity is large and the deodorization efficiency is high.

Examples of the fine particle materials include acid clay (montmorillonite), finely powdered silicic acid (white carbon), fine silica-alumina powder, finely powdered silicic acid, aluminum silicate, aluminosilicate, and black carbon, which may be used alone or Two or more kinds are mixed and used.

The gel material is a three-dimensional aggregate of colloidal fine particles whose particle system is generally submicron. When the specific surface area of the gel material is 50 m ² / g or more, the contact area with the gas containing the odorous substance is large, the deodorizing efficiency is high, and the amount of acid carried is increased, so the removal capacity is large. ， High deodorizing efficiency.

As the inorganic gel material, for example, silica gel, activated silica gel, alumina gel, silica-alumina gel, cement or the like is used. As an organic gel material,
For example, polymethylmethacrylate-based microgel, polystyrene-based microgel, polyvinylpyridine-based microgel, and other gel-type ion-exchange resins are used.

The deodorant material of the present invention is used after being molded, if necessary. Any molding means may be used, but extrusion molding, tablet molding, rolling granulation, compression molding and the like are preferable. The shape of the molded deodorant material can be appropriately selected according to the place of use and method, and examples thereof include a cylindrical shape, a crushed shape, a spherical shape, a honeycomb shape, an uneven shape, and a corrugated plate shape.

In particular, when a malodorous gas is brought into contact with a deodorant material by a fan or the like to be adsorbed and removed, the deodorant material is preferably formed into a mesh shape, a corrugated plate shape or the like and used as a filter or a honeycomb filter. At the time of molding, natural polymers such as starch, lignin, and furi, cellulose ethers or their derivatives, polyether resins, acrylic resins, stearic acid, polyvinyl resins, and other synthetic resins may be added.

Since the deodorizing material of the present invention is particularly effective when used in a closed living space, it is preferable to take measures so that fine powder does not float from the deodorizing material during use. As a countermeasure, for example, it is preferable to mold the deodorant material using a binder or pack the deodorant material in a fine mesh bag for use. Further, when the malodorous gas is brought into contact with the deodorizing material by a fan or the like to be adsorbed and removed, it is preferable to use in combination with a dust filter or the like, or to apply the deodorizing material to the skin or the like with a binder or the like to fix it.

In the deodorizing material of the present invention, in addition to the acid, a reagent which reacts with a malodorous component to reduce the odor is used alone or 2
You may mix and attach more than one kind. Examples of such reagents include metal salts of zinc, copper, iron, manganese, nickel, etc., alkali metal salts of sodium hydroxide, ferric hydroxide, etc., peroxides, iodine, iodine compounds, plant extraction oils, etc. There are various deodorants. Further, the deodorizing material of the present invention,
Other additives may be added as long as the characteristics are not impaired.

Next, the invention of claim 6 is a deodorizing method in which a base material is impregnated with an acid having a larger Hammett acidity function than the acid of the acid salt of the basic substance. The deodorizing method is characterized in that the acid salt of the basic substance is removed from the gas by contacting the material.

In this deodorizing method, an acid having a larger Hammett acidity function than the acid of the acid salt contained in the gas to be treated is attached to the substrate. Therefore, the acid salt of the basic substance can be surely adsorbed and removed from the gas to be treated.

The deodorizing mechanism in this deodorizing method is
It is thought to be due to the following. A mere basic substance is trapped by any acid by chemisorption such as acid-base bond (neutralization reaction). However, since the acid salt of the basic substance is already bound to the acid, it cannot be trapped by the acid-base bond (neutralization reaction).

Therefore, in the deodorant material of the present invention, it is considered that an exchange reaction occurs in which the acid moiety of the acid salt of the basic substance is exchanged from a relatively weak acid to a relatively strong acid. If a relatively strong acid is fixed to the deodorant, the basic substance in the form of an acid salt is eventually trapped in the deodorant. Further, among the deodorizing materials of the present invention, those having a porous material as a base material not only chemically adsorb the gas to be treated but also physically adsorb it. From the above, the deodorant material of the present invention is considered to adsorb and remove the acid salt of the basic substance with high efficiency.

In the invention of claim 6, as the acid attached to the base material, as in the invention of claim 7, the acid attached to the base material is a non-volatile or low-volatile acid. It is preferable. The reason is the same as the invention of claim 2. Further, it is preferable that the acid attached to the base material is chemically bonded to the surface functional group of the base material as in the invention of claim 8. The reason is the same as that of the invention of claim 3.

Further, as in the invention of claim 9, it is preferable that the material is a porous material and the acid is filled in the pores of the base material. The reason is the same as that of the invention of claim 4. Further, as in the invention of claim 10, the base material is
It is preferably an inorganic or organic porous material, a particulate material or a gel material. The reason is the same as in claim 5.

In the eleventh aspect of the invention, it is preferable that the deodorizing method is performed in a closed space. This makes it possible to exert the highest deodorizing effect on the basic substance and its acid salt. In addition, in the invention of claim 6, the same thing as the invention of claim 1 can be used in other respects.

[0045]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 A deodorizing material according to an embodiment of the present invention will be described.
The deodorizing material of this example has a Hammett acidity function of-(minus)
A sulfuric acid of 11.9 was attached to a base material. Activated carbon is used as the base material.

Next, a method for producing the above deodorant material will be described. First, 2 g of sulfuric acid (Hammett's acidity function: -11.9) was dissolved in 25 ml of ion-exchanged water with respect to 20 g of crushed activated carbon having a particle size of 32 to 60 mesh and made of palm shell. This aqueous solution was stirred to uniformly impregnate activated carbon with sulfuric acid. After air-drying at room temperature for 10 hours, it was dried at 105 ° C. for 2 hours using a hot air dryer. As a result, the above deodorant material was obtained. The specific surface area of this deodorizing material was measured by the nitrogen flow BET one-point method, and the results are shown in Table 1.

3 mg of the above deodorant was placed in the bottom of a 100 ml headspace bottle. Next, 2 mg of triethylenediamine (TEDA) and 10 μl of 2N hydrochloric acid were put in the headspace bottle and sealed so as not to come into contact with the deodorant. This headspace bottle at 80 ℃
Was placed in a constant temperature bath of No. 3, and triethylenediamine and hydrochloric acid (Hammet's acidity function of concentrated hydrochloric acid: -4.4) were vaporized to generate triethylenediamine hydrochloride. After 40 minutes, the amine removal rate by the deodorant was measured by a gas chromatograph with a detector FTD. The measurement results are shown in Table 1.

The amine removal rate by the deodorizing agent was the same as the amine removal rate of a gas chromatograph obtained by the same measurement with 2 mg of triethylenediamine and 10 μl of 2N hydrochloric acid in the headspace bottle without the deodorizing agent. It was calculated from the peak area ratio of In this measuring method, since a large excess of hydrochloric acid is reacted with triethylenediamine, the total amount of triethylenediamine is a hydrochloride. Therefore, "removal rate of amine" means "removal rate of acid salt of amine".

Next, the flow-through amine removal test shown in FIG. 1 was conducted. That is, first, in a constant temperature bath 7 at 60 ° C., 1 ml of the deodorizing material 1 was filled in a quartz glass tube 2 having an inner diameter of 10 mm.
Triethylenediamine (TEDA) as an amine source
And N, N, N ′, N ′,-tetramethyl-1,6-hexanediamine (TMHDA), and tris (2-chloroethyl) phosphate (TCEP) as a chlorine source,
15 ml each for gas absorption cleaning bottles 31, 32, 33
50 ml / min, 100 ml / min, 20 respectively
Air was bubbled through at 0 ml / min.

The mixed gas thus generated is used as a deodorizing material 1
It was passed through a quartz glass tube 2 filled with, and the concentration of incoming gas and the concentration of outgoing gas were measured by a gas chromatograph of a detector FTD. In FIG. 1, reference numeral 5 indicates a flow meter when the gas absorption and cleaning bottles 31, 32, and 33 air are fed.
Then, the amine removal rate by the deodorant was calculated by the following formula, and the measurement results are shown in FIGS. Amine removal rate = 100 x (input gas concentration-outgas concentration)
÷ Gas concentration

Comparative Example 1 The deodorizing material of this example is the activated carbon used in the first embodiment.
In producing the above deodorant material, the coconut shell used in Example 1 was prepared as a raw material. This palm shell has a grain size of 3
The crushed activated carbon of 2 to 60 mesh was dried at 105 ° C for 2 hours using a hot air dryer. As a result, the deodorizing material of this example was obtained.

The specific surface area of this deodorant material is nitrogen flow type BE.
It was measured by the T1 point method. In addition, the amine removal rate by the deodorant of this example was measured by the same test as in the first embodiment. The results of these measurements are shown in Table 1. A flow-type amine removal test was conducted on the above deodorant material, and the measurement results are shown in FIGS.

Comparative Example 2 In place of the sulfuric acid used in the first embodiment, formic acid (Hammett's acidity function: −2) was attached to the base material in the deodorizing material of this example. Others are the same as those in the first embodiment.
With respect to the deodorizing material of this example, the specific surface area and the amine removal rate were measured in the same manner as in Example 1, and the results are shown in Table 1.

Embodiment 2 The deodorizing material of this embodiment uses crushed silica gel having a particle size of 32 to 60 mesh instead of the activated carbon used in Embodiment 1. Others are the same as those in the first embodiment. With respect to the deodorizing material of this example, a flow-type amine removal test was conducted in the same manner as in Example 1, and the results are shown in FIGS.

[0055]

[Table 1]

Next, various measurement results for the first and second embodiments will be considered. First, as is known from Table 1, the deodorizing material of Example 1 had a higher amine removal rate than Comparative Examples 1 and 2 despite having a smaller specific surface area. From this, the deodorizing material of the first embodiment is
It can be seen that it has excellent amine removal performance.

Next, as is known from FIG. 2 and FIG. 3, the removal rate of TEDA, which is a basic substance, is about
The deodorant material of No. 1 was higher than that of Comparative Example 1. Further, as shown in FIG. 3, the deodorizing materials of Embodiments 1 and 2 were also significantly higher than the comparative example 1 in terms of the removal rate of the basic substance TMHDA. From these, it can be seen that the deodorizing material of this example has a high effect of removing the basic substance amine and has excellent deodorizing performance.

Embodiment 3 As the deodorizing material of this embodiment, crushed activated carbon having a grain size of 8 to 20 mesh was used in place of the activated carbon used in Embodiment 1. In producing this deodorizing material, 20 g of sulfuric acid (Hammett acidity function: -11.
9) was dissolved in 220 ml of ion-exchanged water. This aqueous solution was stirred to uniformly impregnate the crushed activated carbon with sulfuric acid.
The crushed activated carbon was naturally dried at room temperature for 10 hours and then dried at 105 ° C. for 2 hours using a hot air dryer. As a result, the deodorizing material of this example was obtained.

The specific surface area of the obtained deodorant was measured, and the results are shown in Table 2. In addition, 100g of deodorant
Each was packed in a 60-mesh bag, and two bags were placed on the rear package tray of an automobile (2000 cc sedan). This car was placed in sunny summer for half a day, and the amine concentration inside the car was measured with a gas detector tube.

Since the basic gas and the acidic gas exist at the same time in the passenger compartment under the fine weather of this summer, a part of the basic gas is converted into an acid salt of the basic gas by a reaction such as neutralization or addition. Presumed to exist. Therefore, the amine concentration in the passenger compartment is considered to mean the concentration of amine and its acid salt. For comparison, the amine concentration inside the vehicle was measured when the deodorant of this example was not placed inside the vehicle.

The results of these measurements are shown in Table 2. As is known from the table, placing the deodorant material of this example inside the vehicle exhibited a remarkable effect. From this, it can be seen that the deodorizing material of this example exhibits an excellent deodorizing effect even at the actual use level.

[0062]

[Table 2]

[0063]

EFFECTS OF THE INVENTION According to the present invention, it is possible to provide a deodorizing material and a deodorizing method having an excellent deodorizing performance against an acid salt of a basic substance and a basic gas.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a flow-through type amine removal test in Embodiment 1.

FIG. 2 is a diagram showing TEDA removal rates of the deodorizing materials of Embodiments 1 and 2 and Comparative Example.

FIG. 3 is a diagram showing the TMHDA removal rates of the deodorizing materials of Embodiments 1 and 2 and Comparative Example.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiji Onoda, Aichi Prefecture, Nagakute Town, Aichi Prefecture, Nagata 1 1 at 41 Yokochi, Toyota Central Research Institute Co., Ltd. (72) Inventor Hideki Ohno 1 Toyota Town, Toyota City, Aichi Prefecture Address Toyota Motor Corporation (72) Inventor Miho Matsuo 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation

Claims (11)

[Claims] 1. A deodorizing material, characterized in that an acid having a Hammett acidity function negatively larger than -4.4 is attached to a base material. 2. The deodorizing material according to claim 1, wherein the acid is a non-volatile or low-volatile acid. 3. The deodorizing material as claimed in claim 1, wherein the acid is chemically bonded to a surface functional group of the base material. 4. The method according to claim 1, wherein
A deodorizing material, wherein the base material is a porous material, and the pores of the base material are filled with the acid. 5. The method according to claim 1, wherein
The deodorizing material, wherein the base material is an inorganic or organic porous material, a fine particle material or a gel material. 6. A gas containing an acid salt of a basic substance is brought into contact with a deodorizing material obtained by impregnating a base material with an acid having a Hammett acidity function of which is larger than that of the acid of the acid salt. A deodorizing method comprising removing an acid salt of the basic substance from the inside. 7. The deodorizing method according to claim 6, wherein the acid attached to the base material is a non-volatile or low-volatile acid. 8. The deodorizing method according to claim 6, wherein the acid attached to the base material is chemically bonded to a surface functional group of the base material. 9. The method according to claim 6, wherein:
The deodorizing method, wherein the base material is a porous material, and the pores of the base material are filled with the acid. 10. The deodorizing method according to claim 6, wherein the base material is an inorganic or organic porous material, a fine particle material or a gel material. 11. The deodorizing method according to claim 6, wherein the deodorizing method is performed in a closed space.