JP2001000522A - Deodorant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove acidic gaseous components and basic gaseous components with high efficiency by using a product formed by reacting an aromatic compound having a basic group accompanied by a lone electron pair and an acidic group capable of dissociating proton and a salt of an organic or inorganic weak acid of the amount equivalent thereto or above as an effective component. SOLUTION: The deodorant for simultaneously and highly efficiently adsorbing the acidic gaseous components as represented by aldehydes and the basic gaseous components as represented by amines is prepared by using the product formed by reacting the aromatic compound having the basic group accompanied by the lone electron pair and the acidic group capable of dissociating the proton and the salt of the organic or inorganic weak acid of the amount equivalent thereto above as the effective component. Such deodorant may be utilized as a filter for air cleaners in the rooms of, for example, buildings and the rooms of automobiles, etc., as a decorative material for deodorization, etc. Either of aminobenzenesulfonic acid or aromatic amino acid is used as the aromatic compound and a polybasic acid is used as the weak acid constituting the salt of the weak acid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizer, and more particularly, to an acid gas component represented by aldehydes,
The present invention relates to a deodorizing material for simultaneously and efficiently adsorbing a basic gas component represented by amines.

[0002]

2. Description of the Related Art Volatility of acidic gas components such as aldehydes such as acetaldehyde, basic gas components such as amines such as trimethylamine and ammonia and the like in the interior of houses and the interior of automobiles. It contains a lot of odorous components, and its simultaneous removal is desired.

[0003] Conventionally, generally, odor components are adsorbed and absorbed.
Activated carbon is widely used as a deodorant for removal. However, activated carbon alone does not have sufficient adsorption power for odor components. Activated carbon also has selectivity in the type of odor component to be adsorbed, and does not necessarily exhibit good adsorption ability to nitrogen-containing compounds such as acetaldehyde and amines. Further, activated carbon has another problem that the adsorbed malodorous component is easily removed again.

On the other hand, in order to overcome the above dissatisfaction with a deodorizing material consisting only of activated carbon, several deodorizing materials in which sulfanilic acid or the like is carried as a deodorizing component on a porous carrier such as activated carbon have recently been proposed. I have.

For example, Japanese Patent Application Laid-Open No. Hei 7-136502 discloses an "adsorbent for ammonia and aldehyde in which an aromatic amine such as p-aminobenzenesulfonic acid (sulfanilic acid) is supported on a predetermined activated carbon material". ing.
Also, Japanese Patent Application Laid-Open No. 10-99418 discloses that “a basic compound such as sodium hydroxide is contained in an air purifying agent mixture containing an aromatic amine such as sulfanilic acid and a porous body,
A deodorizing filter obtained by molding this into a monolithic shape with an organic binder "is disclosed.

[0006]

By the way, p-aminobenzenesulfonic acid originally has a lone electron pair in the amino group as shown in (a) of Chemical Formula 1, and this lone electron pair is a nucleophilic reaction. However, when p-aminobenzenesulfonic acid is present alone (in a free state) as in the invention according to Japanese Patent Application Laid-Open No. Hei 7-136502, the acid gas is actually trapped. As shown in (b) of “Formula 1”, zwitterions are formed by the transfer of protons, and in this state, there is no lone electron pair of the amino group. Therefore, the adsorbent disclosed in JP-A-7-136502 has a problem that it is difficult to effectively trap at least aldehyde and the like.

[0007]

Embedded image On the other hand, when the sulfanilic acid and the basic compound (for example, sodium hydroxide) are present in the same system as in the invention according to Japanese Patent Application Laid-Open No. 10-99418, sodium sulfanilate generated by the reaction of the two reacts with a proton. Since it loses and does not form a zwitterion as described above, a lone electron pair of the amino group is secured, and the ability to trap aldehydes and the like is maintained.

[0008] However, in the same publication, "001"
As is apparent from the paragraphs "1" to "0012", the basic compound is used for the purpose of "adding a basic compound to suppress the acidity of sulfanilic acid to prevent deterioration of the organic binder", "If not used in a limited molar ratio to sulfanilic acid, the sulfone groups would be excessively neutralized and the ammonia removal performance by the sulfone groups would be reduced."
The molar ratio of sulfanilic acid is suppressed to 0.7 or less in all cases (see Table 1 of the publication).

However, according to the study by the present inventor, when sulfanilic acid is reacted with monosodium phosphate which is a salt of a weak acid as shown in, for example, Chemical Formula 2, the generated sodium sulfanilate (c) is produced. As described above, it is true that the ability to trap an acidic gas such as an aldehyde is maintained. However, a basic gas such as ammonia is not a sulfone group but sodium sulfanilate (c).
At the same time, it is trapped by the phosphoric acid (d) generated.

[0010]

Embedded image Therefore, limiting the molar ratio of the basic compound to the sulfanilic acid to be low as in the invention according to the above-mentioned Japanese Patent Application Laid-Open No. 10-99418 is the same as the above (c),
In other words, the effect of the present invention is suppressed in the sense of reducing the amount of the product compound having an effective trapping ability for an acidic gas or a basic gas as in (d). If, in the examples of the publication, the use of NaOH in a relatively high molar amount resulted in a decrease in ammonia removal performance, the cause was rather that sulfanilic acid was neutralized with a strong alkali, and the liquidity was basic. At a point that is strongly inclined to
it is conceivable that.

In view of the above-mentioned problems of the prior art, the present invention is a deodorizing material utilizing sulfanilic acid, wherein an acidic gas component such as aldehyde and a basic gas component such as ammonia are simultaneously well-balanced, and An object to be solved is to provide a deodorizing material that can be removed with high efficiency. In view of the above-mentioned problems of the prior art, the present inventor has found that it is effective to react a salt of a weak acid with sulfanilic acid or the like in an equivalent amount, and completed the present invention.

[0012]

Means for Solving the Problems The structure of the first invention of the present application (the invention according to claim 1) for solving the above-mentioned problems is that a basic group having a lone pair of electrons and a proton are provided. An aromatic compound (A) having an acidic group capable of dissociating
Organic or inorganic weak acid salt (B) in an equivalent amount or more
And a product obtained by reacting the above with an active ingredient.

(Structure of the Second Invention) The structure of the second invention of the present application (the invention according to claim 2) for solving the above problems is as follows.
The deodorizing material according to the first aspect of the present invention satisfies at least one of the following conditions (1) to (3). (1) The aromatic compound (A) is either aminobenzenesulfonic acid or aromatic amino acid. (2) The weak acid constituting the salt (B) of the weak acid is a polybasic acid. (3) The reaction product is supported on a porous carrier.

(Structure of the Third Invention) The structure of the third invention (the invention according to claim 3) for solving the above problems is as follows.
The deodorant according to the first or second aspect of the present invention is a deodorizer capable of simultaneously removing an acidic gas component and a basic gas component with high efficiency.

[0015]

(Actions and effects of the first invention) The actions and effects of the first invention will be described in accordance with the above "Chemical Formula 2". An aromatic compound (A) such as sulfanilic acid and phosphorus In the reaction with a salt (B) of a weak acid such as monosodium acid,
A basic component such as Na in the salt of a weak acid (B) is bonded to a proton dissociating acidic group such as a sulfone group in the aromatic compound (A) to form a sodium sulfanilate.
By forming a salt such as (c), formation of the zwitterion is prevented, a lone electron pair of a basic group in the aromatic compound (A) is secured, and acidity due to a basic group such as an amino group is increased. Good trapping ability for gas components is maintained. The aromatic ring structure enhances this ability.

On the other hand, an acid component such as phosphoric acid in the salt (B) of a weak acid such as monosodium phosphate is combined with the above-mentioned protons to generate a weak acid such as phosphoric acid (d), thereby producing a basic gas component. Satisfactorily exhibit trapping ability.
Further, since the generated acid is a weak acid, the liquid does not have strong liquidity and does not tend to be basic as in the prior art, and the trapping ability for the basic gas component is not hindered.

Further, since the aromatic compound (A) such as sulfanilic acid is reacted with a salt (B) of a weak acid such as monosodium phosphate in an equivalent amount or more, the aromatic compound (A) such as sodium sulfanilate is reacted. ) Is produced to the maximum, and an equivalent amount of a weak acid such as phosphoric acid is produced, whereby the deodorizing effect of the deodorizing material is enhanced as much as possible. In addition, in order to secure the equivalent reaction, the salt (B) of a weak acid having a relatively low dissociation degree is excessively used, and a part of the salt (B) may remain in the deodorizing material. Does not inhibit.

(Function / Effect of the Second Invention) In the second invention, as the aromatic compound (A) of the deodorizing material, any one of aminobenzenesulfonic acid and aromatic amino acid which have been conventionally regarded as effective deodorizing components (A) In particular, by using the former, a particularly excellent deodorizing effect can be expected.

Further, by using a polybasic acid as the organic or inorganic weak acid salt (B) of the deodorizing material, the number of trap sites for a basic gas component such as ammonia is increased, and as a result, the basic gas is reduced. The deodorizing ability for the components is higher.

Further, the reaction product according to the first invention, that is, a salt of an aromatic compound (A) having an ability to trap acidic gas components such as aldehyde, and a weak acid having an ability to trap basic gas components such as ammonia are used. By supporting on a porous carrier, the amount of the carrier can be easily increased, and from the high gas exchange capacity of the carrier,
The deodorizing ability for the acidic gas component and the basic gas component is further increased.

(Operation / Effect of Third Invention) For the reasons described as the operation / effect of the first invention and the second invention, this deodorizing material is made of the adsorbent disclosed in JP-A-7-136502. Unlike the deodorizing filter disclosed in Japanese Patent Application Laid-Open No. 10-99418, it can exhibit the performance of simultaneously removing the acidic gas component and the basic gas component with high efficiency.

[0022]

Next, embodiments of the first to third inventions will be described. In the following, simply "the present invention"
When it says, it points to 1st invention-3rd invention collectively.

[Deodorizing Material] The deodorizing material of the present invention comprises, as an active ingredient, a product obtained by reacting an aromatic compound (A) with an organic or inorganic weak acid salt (B) in an equivalent amount.

The form of use of the deodorant is not limited. For example, the active ingredient may be used as it is (powder, granule, etc.) in a suitable air-permeable container or the like or stored in an air passage. It may also be used by mixing with other powder components for any purpose such as increasing the amount or imparting a fragrance, and further supported in an arbitrary form on a carrier of a predetermined shape such as pellets or monoliths of various shapes. It is also preferable to use them.

As the carrier, a porous substance is particularly preferred. Activated carbon, porous metal oxide, sepiolite, palygorskite, smectite,
And clay minerals such as imogolite. As the porous metal oxide, porous silica, alumina, titania, zirconia, or the like having a large number of hydroxyl groups on the surface, or a composite oxide thereof can be arbitrarily used.

The pore size distribution or average pore size of the porous material is not particularly limited as long as it is not so small as to hinder the introduction of the active ingredient and the adsorption of the acidic gas component and the basic gas component. .

The deodorizing material is used in the form of a deodorizing element in which a deodorizing material is held on a support in the form of a sheet, a pellet, a honeycomb, or the like using various known binders such as polyvinyl alcohol and acrylic emulsion. You may. Further, for example, a form in which a deodorant of the present invention is added to and mixed with a skin composition, such as a skin material for a vehicle, to give a deodorizing function.

[Use of Deodorizing Material] The use of the deodorizing material of the present invention is not limited. For example, it is used as a filter for an air purifier, a deodorizing sheet, a decorative material for deodorizing, etc. in the interior of a building or the interior of a car. be able to.

The deodorizing material of the present invention is preferably used particularly when it is desired to deodorize both odors caused by aldehydes, amines and ammonia. However, acidic odor components other than aldehydes (for example, hydrogen sulfide, mercaptan, etc.), Amines,
Basic odor components other than ammonia (for example, pyridine,
Skatole, etc.) are also preferably used. Furthermore, it may be used when only one of the above-mentioned various acidic odor components and basic odor components is to be deodorized.

There is no limitation on the form of use of the deodorant. For example, the active ingredient in its raw material form (powder, granule, etc.) or a substance in which the active ingredient is supported on a powder or granule carrier may be used in an appropriate form. It may be used by filling it in a permeable container or the like or by containing it in a ventilation path portion, or using a known various binder such as polyvinyl alcohol or acrylic emulsion to support a sheet, pellet, or honeycomb shape. It may be used in the form of a deodorizing element holding a deodorizing material on the body. Further, for example, a form in which a deodorant of the present invention is added to and mixed with a skin composition, such as a skin material for a vehicle, to give a deodorizing function.

[Salt of aromatic compound (A) and weak acid (B)]
The aromatic compound (A) has a basic group having a lone pair of electrons in an aromatic ring and an acidic group capable of dissociating protons. The type of the basic group and the acidic group is not limited, but an amino group is typical as the basic group with a lone electron pair, and a carboxyl group or the like may be used as the acidic group capable of dissociating a proton. Groups are particularly preferred. As the aromatic compound (A), aminobenzenesulfonic acid such as p-aminobenzenesulfonic acid (sulfanilic acid) and aromatic amino acids are particularly preferred.

The salt (B) of the weak acid may be a salt of an organic acid or a salt of an inorganic acid, and may be a monobasic acid or a polybasic acid. The base component in the weak acid salt (B) is sodium,
It may be an alkali metal element such as potassium, an alkaline earth metal element such as magnesium or calcium, or a basic atomic group such as ammonia.

Specific examples of the weak acid salt (B) include monosodium phosphate, disodium phosphate, trisodium phosphate,
Examples thereof include sodium carbonate, sodium bicarbonate, potassium acetate, monosodium citrate, and disodium citrate.

In the deodorizing material of the present invention, an aromatic compound (A) is reacted with a salt (B) of a weak acid in an equivalent amount or more, and the product of this reaction is used as an active ingredient. Here, "equivalent or more" means that the amount of the salt (B) of the weak acid is the total amount of the aromatic compound (A), or at least 85% or more (the effect of the invention can be substantially maintained at or above this limit). We say that it is enough to react.

When the degree of dissociation of the weak acid salt (B) is low, the effect of the present invention is adversely affected even if the weak acid salt (B) is used in a stoichiometric excess to satisfy the above requirements. However, it is not preferable to use a stoichiometrically excessively small amount (equivalent to or less than the equivalent in the above-mentioned meaning) because the effect of the invention is impaired.

The product of the above-mentioned reaction is a salt in which a base component of a salt (B) of a weak acid is bonded to an acidic group of an aromatic compound (A), and traps an acidic gas component such as an aldehyde. And an acid in which a proton of the acidic group of the aromatic compound (A) is bonded to the acid component of the salt (B) of the weak acid and traps a basic gas component such as ammonia.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides the following (a) to
It can be carried out in the preferred embodiment of (l). (A) A deodorizing agent comprising, as an active ingredient, a product obtained by reacting an aromatic compound (A) with a salt (B) of a weak acid in an equivalent amount or more. (B) In the above (a), the aromatic compound (A) is either aminobenzenesulfonic acid or aromatic amino acid. (C) In (b) above, the aminobenzenesulfonic acid is sulfanilic acid. (D) In the above (a) to (c), the weak acid salt (B) is an organic or inorganic polybasic acid salt. (E) In the above (a) to (d), the salt (B) of the weak acid is monosodium phosphate, disodium phosphate, trisodium phosphate, sodium carbonate, sodium bicarbonate, potassium acetate, monosodium citrate, Disodium citrate or trisodium citrate. (F) In the above (a) to (e), the deodorant uses the above-mentioned active ingredient as it is in the form of a solution, powder or granules. (G) In the above (A) to (F), the deodorant is used by supporting the above-mentioned active ingredient on a carrier having a predetermined shape in an arbitrary form. (H) In the above (g), the carrier is a porous substance. (I) In the above (H), the porous substance is activated carbon, porous metal oxide or clay mineral. (U) In the above (a) to (i), the deodorizing material is used as a filter for an air purifier in the interior of a building or the interior of an automobile.
It is used as a deodorizing sheet or a deodorizing decorative material. (R) In (A) to (D) above, the deodorizing material can simultaneously remove the acidic gas component and the basic gas component with high efficiency.

[0038]

EXAMPLE To 12 g of water, 12 g of sulfanilic acid and 27.8 g of monosodium phosphate dihydrate were added, and the mixture was thoroughly stirred and dissolved to cause the reaction shown in the above "Chemical formula 2". (C) and (d) were obtained.

Next, 300 g of coconut husk activated carbon having a particle size of 4 to 6 mesh was weighed and placed in a 5-liter container, and the entire amount of the above reaction product was poured into the container at one time.
The reaction product was absorbed and supported on coconut shell activated carbon while stirring. Then, it was dried by heating at 100 ° C. for 2 hours to obtain a deodorizing material according to the example.

Using the deodorizing material according to the above example and the comparative deodorizing material made of the above-mentioned coconut shell activated carbon not supporting the reaction product, an adsorption performance test was conducted by the following flow-type test method.

That is, a column packed with 10 g of each of the deodorizing material according to the example and the deodorizing material for comparison was charged with a concentration of 1%.
2.5 l / min. Of air containing 00 ppm acetaldehyde or ammonia. The concentration of each odorant was measured at the outlet and the inlet of the column at predetermined intervals, and the odorant removal rate by the deodorizing material was calculated. In addition,
The analysis of each odorous substance was performed using a gas chromatograph for acetaldehyde and a gas detection tube for ammonia.

FIG. 1 shows the measurement results of the deodorizing material for removing acetaldehyde, and FIG. 2 shows the measurement results of the deodorizing material for removing ammonia. 1 and 2, the notation "the present invention" indicates a deodorizing material according to an example, and the notation "activated carbon" indicates a deodorizing material for comparison.
1 and 2 that the deodorizing material according to the example has excellent acetaldehyde and ammonia removal performance.

[Brief description of the drawings]

FIG. 1 is a graph showing acetaldehyde removal performance of a deodorizing material.

FIG. 2 is a graph showing the ammonia removal performance of a deodorizing material.

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Claims (3)

[Claims] 1. An aromatic compound (A) having a basic group having a lone electron pair and an acidic group capable of dissociating protons, and an organic or inorganic weak acid salt (B) having an equivalent amount or more thereof. A deodorizing material characterized by using a reacted product as an active ingredient. 2. The deodorizing material according to claim 1, wherein the deodorizing material satisfies at least one of the following conditions (1) to (3). (1) The aromatic compound (A) is either aminobenzenesulfonic acid or aromatic amino acid. (2) The weak acid constituting the salt (B) of the weak acid is a polybasic acid. (3) The reaction product is supported on a porous carrier. 3. The deodorizing material according to claim 1, wherein the deodorizing material is capable of simultaneously removing an acidic gas component and a basic gas component with high efficiency.