JPH01238866A - Deodorizer - Google Patents

Abstract

PURPOSE:To produce an excellent deodorizing effect against four main odors of ammonia, hydrogen sulfide, methylmerptan, and trimethylamine, by a method wherein a deodorizer is formed by a composition, formed by at least one compound selected from ferrous salt, citric acid, tartaric acid, maleic, acid, malic acid, phosphoric acid, and L-ascorbic acid, and basic compound. CONSTITUTION:A deodorizer consist of a composition formed by ferrous salt and a specified compound, and a basic compound. First iron salt is a component to chemically react to odor gas for deodorization, and ferrous sulfate, ferrous ammonium sulfate can be listed as ferrous salt. A composition formed by at least one kind of a compound selected from citric acid, tartaric acid, maleic acid, malic acid, phosphatic acid, and L-ascorbic acid is chemically reacted to ferrous ion to effectively function for suppression of oxidation of iron ion and maintenance of an active state, and deodorizes odor by itself through chemical reaction. A basic compound promotes reaction between an ion-contained compound, e.g., methylmercaptan, hydrogen sulfide, and ferrous salt, and the basic compound itself reacts for deodorization. Salt consisting of weak acid and strong base are listed as the basic compound.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a deodorizing material, and more specifically, the present invention relates to a deodorizing material that contains four malodorous components such as ammonia, trimethylamine,
This invention relates to a deodorizing material that exhibits excellent deodorizing effects against methyl mercaptan, hydrogen sulfide, and the like.

[Prior art] Conventional methods for removing malodorous gases include a sensory deodorization method that masks the gas with fragrance, a chemical deodorization method that removes it by chemically reacting with a substance whose main ingredients are citric acid, maleic acid, etc., and activated carbon. , physical deodorization methods using microporous materials such as zeolite are known.

However, the current situation is that these methods do not provide a sufficient deodorizing effect. For example, masking methods with fragrances do not essentially remove odors, so they are not effective against strong odors.

Methods using substances mainly composed of citric acid, maleic acid, etc. can only remove malodorous components such as ammonia and amines. In addition, methods using microporous materials such as activated carbon and zeolite are relatively effective for a variety of gases, but have the disadvantage of limited adsorption capacity and little effect on ammonia. .

On the other hand, the deodorizing method using ferrous sulfate and [-ascorbic acid compound proposed in Japanese Patent Publication No. 61-113091 is effective against ammonia and trimethylamine, but it is effective against methyl mercaptan, hydrogen sulfide, etc. There is a problem that the effect is insufficient for sulfur-containing compounds, and the deodorizing ability decreases when left in the air for a long period of time.

Further, the deodorizing method using metal phthalocyanine proposed in JP-A No. 61-258078 has excellent long-term sustainability of the effect, but has the problem that it is difficult to support the metal phthalocyanine on the base material.

The present inventors have previously applied for a deodorizing material that has improved these problems, but although some improvement effects have been recognized,
However, the situation has not yet reached a fully satisfactory state.

[Problems to be Solved by the Invention] The present invention improves the drawbacks of the prior art described above, and has an excellent deodorizing effect against the four malodorous components of ammonia, hydrogen sulfide, methyl merbutane, and trimethylamine. The purpose is to provide a deodorizing material.

[Means for Solving the Problems] The object of the present invention is to combine ferrous salts, citric acid, tartaric acid,
Maleic acid 1. This is achieved by a deodorizing material composed of a basic compound and a composition composed of at least one compound selected from malic acid, phosphoric acid, and [-ascorbic acid.

The present invention will be explained in detail below.

The ferrous salt referred to in the present invention is a component that chemically reacts with malodorous gas to deodorize it, and specific examples thereof include ferrous sulfate, ferrous ammonium @acid, ferrous chloride, and nitric acid. Examples include first iron.

These may be used alone or in a mixture. The ferrous salt is usually prepared as a 0.01 to 1 molar aqueous solution.

In addition, the citric acid, tartaric acid, malic acid, maleic acid, phosphoric acid, and [-ascorbic acid referred to in the present invention act effectively to suppress the oxidation of iron ions and maintain the active state through chemical reactions with ferrous ions. It is also a component that eliminates bad odors through a neutralization reaction.

Among these compounds, compounds having a carboxyl group can also be used in which part or all of the carboxyl group is a. This compound has the advantage that it is harmless to the human body, does not pollute the environment, and is industrially inexpensive. Among these, citric acid, tartaric acid, maleic acid, and malic acid particularly exhibit deodorizing effects.

These compounds (A) differ from ferrous salt (B) in (A)
/(B)=0.003/1 to 2/1 (1 mole), preferably 0.01/1 to 1.5/1 (1 mole) for long-term stabilization of ferrous ions, It is preferable from the viewpoint of long-term deodorizing effect.

Further, if necessary, a sulfate and/or a sulfite may be used as a third component to further enhance the effect. It also enhances the deodorizing effect in terms of long-term sustainability, whiteness and adhesion of the molded product to which the deodorizing stock solution has been applied. Specific examples of these include water-soluble salts and are not particularly limited;
Among them, ammonium sulfate, sodium sulfate, ammonium sulfite, sodium sulfite, potassium sulfate, etc. can be mentioned. Sulfate and sulfite (C) are (C,)/(B)=0.05/1 to 10/1 relative to ferrous salt (B)
(1 mol), preferably 0.1/1 to 5/1 (1 mol).

On the other hand, the basic compound referred to in the present invention is one that promotes the reaction between an ionic compound such as methyl mercaptan or hydrogen sulfide and a ferrous salt, and is also a component that reacts itself to deodorize. Specific examples include a substance that releases hydroxyl ions in an aqueous solution or a substance whose aqueous solution has basicity, that is, a salt consisting of a weak acid and a strong base. Examples include, but are not limited to, sodium hydroxide, potassium hydroxide, calcium hydroxide, aluminum hydroxide, barium hydroxide, sodium carbonate, sodium hydrogen carbonate, and sodium acetate.

In addition, the carrier mentioned in the present invention includes papers, knitted fabrics,
Examples include nonwoven fabrics, artificial porous materials, and sawdust. Among these, artificial porosity is particularly preferred.

Examples of artificial porous materials include foam sheets made of polystyrene, polyurethane, polyethylene, and the like.

On the other hand, when attaching the composition to a carrier, the composition may be used as it is, or diluted several times to several hundred times, and then impregnated.
It is best to apply it by spreading, spraying, etc. Alternatively, the composition may be made into granules by evaporation to dryness or the like, and may be applied by a coating method. Of course, it may be attached to part or all of one or both sides of the carrier. Note that the carrier may be composed only of the above composition.

In addition, the amount of adhesion is preferably 0.1 to 500% by weight as a solid content, more preferably,
It is preferably 1 to 200% by weight. If it is less than 0.1% by weight, the deodorizing effect is insufficient, and if it exceeds 500% by weight, it is not preferred from the viewpoint of retention of the composition.

In addition, when attaching the basic compound to the carrier,
Usually, it is preferable to apply the adhesive by impregnating, spraying, spraying, etc. with a 0.01 to 30% aqueous solution.

When used in granular form, it is applied using a coating method. In this case as well, the carrier may be composed only of the basic compound.

In a preferred embodiment of the deodorizing material of the present invention, the composition-containing carrier and the basic compound-containing carrier have a laminated or inclusive structure. Preferred specific examples of the laminated structure include: (1) A sheet-like carrier containing the composition and a sheet-like carrier containing a basic compound are laminated.

(2) A sheet-like carrier containing the composition and a basic compound are layered.

(3) The sheet-like carrier of the composition and the basic compound is laminated.

Examples include, but are not limited to, those having the following structure.

Further, specific examples of the inclusion structure include: (1) A form in which the sheet-like carrier containing the composition includes a basic compound.

(2) A form in which the basic compound-containing sheet-like carrier contains the composition.

Examples include those having the following structure.

As mentioned above, by using the composition and the basic compound in a predetermined manner, the active state of both can be sufficiently maintained, and a synergistic effect also appears, resulting in excellent deodorizing performance against various malodorous gases. show. Moreover, the deodorizing material is particularly effective for filters.

Hereinafter, it will be explained in detail by giving examples.

[Example] Example 1 Ferrous sulfate 0.4 mol/Q, citric acid 0.4 mol/α,
The aqueous solution was adjusted so that the ammonium sulfate content was 0.5 mol/Q. A Tetron nonwoven fabric made of polyethylene terephthalate and having a basis weight of 105 C]/m is immersed in this aqueous solution,
It was padded so that it was 100% squeezed and dried at 110° C. for 5 minutes. The amount of adhesion to the nonwoven fabric was 20.4%. (
The adhesion amount of iron is 2.2%). On the other hand, the same Tetron nonwoven fabric as above was immersed in a 1.5% sodium hydroxide aqueous solution, padded so that it was 100% squeezed, and dried at 120° C. for 5 minutes. These two treated products were stacked on top of each other and the periphery was fused.

Comparative example A ferrous sulfate 0.4 mol/α, citric acid vi 0.4 mol/,
11. The aqueous solution was adjusted to have a sodium sulfate content of 0.5 mol/rL. The same Tetron nonwoven fabric as in Example 1 was immersed in this aqueous solution, padded so that it was 100% squeezed, and dried at 110° C. for 5 minutes.

The amount of adhesion to the nonwoven fabric was 20.5% (the amount of iron adhesion was 2.2%).

Comparative Example B The same Tetron nonwoven fabric as in Example 1 was immersed in a 2.0% sodium hydroxide aqueous solution, padded to 100% reduction, and dried at 120° C. for 5 minutes.

The deodorizing material thus obtained was covered with Tetron non-woven material having a fabric weight of 41q/h, and ammonia, trimethylamine,
The deodorizing effect on methyl mercaptan and hydrogen sulfide was investigated. The evaluation was performed as follows.

Reagents containing various malodorous components were adjusted to a 1% aqueous solution, and 1r11fl of the aqueous solution was collected and placed in a 1000 d Erlenmeyer flask. After leaving it for 1 hour, each 20 cm of deodorizing material was suspended in an Erlenmeyer flask, and the residual bacteria gas concentration was measured with a gas detector after 10 minutes.

Regarding hydrogen sulfide, chicken manure was fermented in an Erlenmeyer flask and the hydrogen sulfide component was measured in the same manner.

The results obtained are shown in Table 1.

As can be seen from this, the product of this example has an excellent deodorizing effect against all of the various malodorous components. Comparative example A
- Although the window effect was observed, the deodorizing effect of Comparative Example B was insufficient against methyl mercaptan and hydrogen sulfide, and the deodorizing effect of Comparative Example B was insufficient, especially against ammonia and trimethylamine. However, the effect was rarely seen.

Example 2 An aqueous solution was adjusted to contain 0.5 mol/Q of ferrous sulfate, 0.5 mol/a of tartaric acid, and 0.5 mol/Q of ammonium sulfite. A polyurethane foam having a thickness of 3 trun was immersed in this aqueous solution, padded to a 300% reduction, and dried at 100° C. for 5 minutes. Adhesion a to polyurethane foam was 66.9%. (The amount of iron deposited is 8.4%). On the other hand, the same polyurethane foam as above was immersed in a 2.0% sodium carbonate aqueous solution.
It was padded to a 00% reduction and dried at 100° C. for 5 minutes. These two treated products were stacked on top of each other and the periphery was fused.

Comparative Examples C, D Ferrous sulfate 0.5 mol/Q, tartaric acid 0.5 mol 10,
An aqueous solution was adjusted to have a sodium sulfite concentration of 0.5 mol/Q, the same polyurethane foam as in Example 2 was immersed in this aqueous solution, and padded to a 300% reduction.
It was dried at 100°C for 5 minutes. Adhesion to polyurethane foam was 66.5%. (The amount of iron attached is 8.4
%) [Comparative Example C]. Further, the same polyurethane foam as in Example 2 was immersed in a 5% sodium carbonate aqueous solution, padded to a 300% aqueous solution, and dried at 100° C. for 5 minutes [Comparative Example D].

The deodorizing material thus obtained was covered with a Tetron nonwoven fabric having a basis weight of 41 g/foot, and the deodorizing effect was examined in the same manner as in Example 1. The results obtained are shown in Table 2.

As can be seen from Table 2, the sample of this example has an excellent deodorizing effect on all malodorous gases. On the other hand, Comparative Example C has an excellent deodorizing effect against ammonia and trimethylamine, but has an excellent deodorizing effect against methyl mercaptan and
The deodorizing effect was insufficient against hydrogen sulfide, and the comparative example showed almost no effect against ammonia and trimethylamine.

Example 3 Ferrous sulfate 0.5 mol/a, citric acid 0.5 mol/α,
An aqueous solution containing 0.5 mol/Q of ammonium sulfate was evaporated to dryness to obtain granules. On the other hand, a nylon nonwoven fabric made of polyamide and having a basis weight of 65C1/TIt was immersed in a 1.0% calcium hydroxide aqueous solution, padded to a 100% aqueous solution, and dried at 100° C. for 5 minutes. Thereafter, the nylon nonwoven fabric was sewn into a bag, and the granules were placed in the bag until it was almost full.

On the other hand, as a comparative example, a fabric weight of 65q/
A nylon nonwoven fabric of TIl was sewn into a bag shape, and the granular composition obtained in Example 3 was placed in the bag until it was almost full (
Comparative Example E).

The deodorizing effect of the thus obtained deodorizing material in the inclusion form was investigated in the same manner as in Example 1.

In this example, ammonia, trimethylamine 1.
It showed excellent deodorizing effects against all malodorous gases such as ethyl mercaptan and hydrogen sulfide.

On the other hand, Comparative Example E showed an excellent deodorizing effect against ammonia and trimethylamine, but had no satisfactory effect against methyl mercaptan and hydrogen sulfide.

However, the illi position is in ppm.

[Effects of the Invention] The deodorizing material of the present invention exhibits an excellent deodorizing effect against many malodorous gases containing four malodorous components such as ammonia, trimethylamine, methylbutane, and hydrogen sulfide. In addition, it has excellent long-lasting effects because it deodorizes by chemically reacting rather than physically adsorbing it like activated carbon.

Further, the deodorizing material of the present invention is suitable for toilets, elderly living rooms, hospital rooms, etc., but is particularly effective for filters used in air purifiers, cleaning rooms, etc. Patent applicant Toshi Co., Ltd.

Claims (5)

[Claims] (1) A composition consisting of a ferrous salt, at least one compound selected from citric acid, tartaric acid, malic acid, maleic acid, phosphoric acid, and L-ascorbic acid, and a basic compound. A deodorizing material featuring: (2) The deodorant material according to claim (1), wherein the composition contains a sulfate and/or a sulfite as a third component. (3) Claim (1) in which the composition is contained in a carrier.
, (2) The deodorant material described in (2). (4) Claim in which the basic compound is contained in the carrier (
1) Deodorizing material described. (5) The deodorizing material according to any one of (1) to (4), wherein the composition-containing carrier and the basic compound-containing carrier have a laminated or inclusive structure.