JP2956112B2 - Deodorant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement of a deodorant, specifically, a nitrogen-containing odorous compound such as ammonia and trimethylamine, and a sulfur-containing compound such as hydrogen sulfide, methyl mercaptan and methyl sulfide. The present invention relates to a deodorant having high adsorption and removal performance for various odorous gases such as odorous compounds and tobacco odors.

The deodorant of the present invention is used for removing odorous gases as described above in working environments in various industrial fields and daily living environments.

[Conventional technology]

As a proposal for improvement of a deodorant by an adsorption method, an aggregate of titanium oxide-magnesia tightly coupled particles is disclosed in
JP-A-63-183065 discloses that basic zinc carbonate is disclosed in
It is disclosed in Japanese Patent Publication No. 39011.

[Problems to be solved by the invention]

Activated carbon (mainly coconut shell activated carbon), which has been used as a deodorant, has a small deodorizing effect on basic gases such as ammonia and alkylamine. A deodorant obtained by binding L-ascorbic acid to iron sulfate has almost no deodorizing effect on hydrogen sulfide, mercaptan and aldehyde, and is easily dissolved in water.

The above-mentioned aggregate of titanium oxide-magnesia tightly coupled particles proposed to improve such a defect is effective for various odorous gases such as hydrogen sulfide, ammonia, amine, aldehyde and mercaptan, but costs are reduced. Due to the high price and the powder, the form of use is limited.

Further, the above proposal using basic zinc carbonate can remove acidic odorous substances such as hydrogen sulfide, but cannot adsorb basic odorous substances such as ammonia.

As described above, the conventional deodorant has poor practicality, such as limited types of deodorizable odorous gas, insufficient deodorizing effect, limited use form, and high cost.

An object of the present invention is to solve the problem of such a conventional deodorant, and can adsorb various odorous gases satisfactorily, is safe and easy to handle, and can be used in various usage forms. It is intended to provide a deodorant.

[Means for solving the problem]

The deodorant of the present invention is obtained by mixing an acidic aqueous sol of a basic carbonate of a II-valent metal and antimony pentoxide with a MO / Sb ₂ O ₅ (M represents a metal atom of a basic carbonate of a II-valent metal) molar ratio of 0.5 to 0.5. 10 to make a uniform slurry, and CO ₃ / MO at 50 ° C ~ 100 ° C
The decarboxylation reaction of the basic carbonate of the II-valent metal is performed until the molar ratio becomes 1/5 to 1/500, and the slurry obtained by this reaction is dried until the water content becomes 10% by weight or less. Deodorant.

Examples of the basic carbonate of a II-valent metal used in the present invention include basic carbonates such as magnesium, beryllium, copper, zinc, lead, nickel, and cobalt. Specific _{examples, 4MgCO 3 · 2Mg (OH)} 2 · 5H 2 O, 3MgCO 3 · M
g (OH) basic magnesium carbonate, such as _{2 · 3H 2 O, 2BeO ·} B
_{eCO 3 · H 2 O, 3BeO} · BeCO 3 · 3H 2 basic carbonate beryllium O _{etc., CuCO 3 · Cu (OH)} 2, 2CuCO 3 · Cu (OH) 2, 3CuO · 2
Basic copper carbonate such as CuCO ₃・ nH ₂ O, ZnCO ₃・ ZnO ・ H ₂ O, 2ZnC
O ₃ · 3Zn (OH ₂ ) · H ₂ O, 2ZnCO ₃ · 3Zn (OH) ₂ , 3ZnCO ₃ ·
_{4Zn (OH) 2, 3ZnCO 3} · 5ZnO · 6H 2 O basic zinc carbonate, _{etc., 2PbCO 3 · Pb (OH)} 2, PbCO 3 · Pb (OH) 2 or the like basic carbonates, 2NiCO ₃ · 3Ni ( _{OH) 2 · 4H 2 O,} NiCO 3 · 2Ni (O
H) ₂ · 4H ₂ O, etc. of the basic nickel carbonate, 2CoCO ₃ · 3Co (O
H) Basic Cobalt Carbonate _{2 and} the like, and these basic carbonates can be easily obtained as commercially available industrial products, and may be used as a mixture.

The acidic aqueous sol of antimony pentoxide used in the present invention can be obtained by a known method. As an example of the method, a method of dealkalizing an alkali antimonate with an ion exchange resin described in U.S. Pat.
No. 53-20479, a method of oxidizing antimony trioxide with hydrogen peroxide at a high temperature, and a method of reacting sodium antimonate with an inorganic acid described in JP-A-61-227918, followed by deflocculation with phosphoric acid. Method.

The acidic aqueous sol of antimony pentoxide used to make the deodorant of the present invention is acidic at a pH of 5 or less, and the primary particle size of the colloid thereof is 2 to 100 mμ, preferably 2 to 50 mμ when observed by an electron microscope. . The antimony pentoxide sol preferably has an Sb ₂ O ₅ concentration of 2 to 40% by weight.

Colloidal antimony pentoxide antimony pentoxide sol of the above can be represented by _{Sb 2 O 5 · (Na 2} O) n · nH 2 O, typically x 0 to 0.4, n is 2-4. The colloidal antimony pentoxide in X-ray diffraction diagram Sb ₂ O ₅ · 4H ₂ O
Crystal peak appears.

The ratio of basic carbonate of divalent metal to acidic aqueous sol of antimony pentoxide used to make the deodorant of the present invention is MO and antimony pentoxide sol in which basic carbonate of divalent metal is represented as oxide. MO / Sb ₂ O of antimony pentoxide (Sb ₂ O ₅₎
The molar ratio is preferably 0.5 to 10.

In the present invention, the mixing method of the acidic aqueous sol of the basic carbonate of the II-valent metal and antimony pentoxide may be a conventional mixing method, which is carried out at room temperature to 100 ° C., preferably room temperature to 50 ° C. This mixing results in a uniform slurry.
The uniform slurry is then heated. The heating temperature is
The basic carbonate is allowed to undergo a decarboxylation reaction until the molar ratio of CO ₃ / MO derived from the basic carbonate in the slurry becomes 1/5 to 1/500. The mixing and reaction time can be completed in a total of 0.5 to 20 hours. The solid content concentration during the mixing and the reaction is preferably 1 to 40% by weight. A slurry having a pH of 4 to 8 is obtained by the above reaction, but the pH may be increased by adding a base such as ammonia as needed.

The product after the completion of the reaction is a slurry of an aggregate of a basic carbonate of a II-valent metal, colloidal antimony pentoxide and an amorphous II-valent metal antimonate formed by this reaction, and the diameter of the aggregate particles Is from 50mμ to 2μ in electron microscope observation
It is about. Aggregates of small particles are obtained when the stirring during mixing and reaction is stronger, and the particles can be further reduced by grinding the slurry with a ball mill, sand grinder, colloid mill or the like.

As a drying method for obtaining the deodorant of the present invention, the above reaction slurry can be dried by spray dryer, drum dryer, freeze drying, hot air drying or natural drying. The drying temperature is not limited, but is preferably from 150 to 250 ° C.

This drying is usually performed so that the water content becomes 10% by weight or less. If necessary, the obtained dried product can be pulverized by a dry pulverizer such as a jet-omizer, a pin disk mill, a mixer, and a ball mill.

The X-ray diffraction diagram of the deodorizing agent of the present invention, the peak of diantimony pentoxide _{(Sb 2 O 5 · 4H 2} O) appears. Also, the MO /
When the Sb ₂ O ₅ molar ratio is 2.0 or more, a peak of a basic carbonate of a II-valent metal appears in the X-ray diffraction pattern of the deodorant of the present invention.
However, these deodorants of the present invention do not show a peak of antimonate of a II-valent metal.

The deodorant of the present invention has a very large specific surface area of 30 to 150 m ² / g, and has excellent gas adsorption ability.

[Action]

Since colloidal antimony pentoxide is an amphoteric oxide, it can also adsorb acid gases such as hydrogen sulfide, but mercaptan salts such as methyl mercaptan, acid gases such as acetic acid, butyric acid and isovaleric acid, and toluene and acetic acid. The ability to adsorb organic solvent gases such as ethyl, methyl ethyl ketone, benzene, styrene, acetaldehyde, kerosene, gasoline, etc. is rather weak.

Although a simple mixture of a basic carbonate of a II-valent metal capable of adsorbing an acidic odorous gas and an acidic antimony pentoxide capable of adsorbing a basic odorous gas cannot provide a high adsorption effect of these gases, the present invention Surprisingly, deodorants have a very high effect of adsorbing these gases. In making the deodorant of the present invention, II
When a basic carbonate of a valent metal is mixed with an acidic antimony pentoxide sol, antimony pentoxide reacts with the basic carbonate to act as a strong acid, and releases carbon dioxide gas out of the system. A colloidal basic carbonate with a high / CO ₃ molar ratio is formed. Basic carbonates with a high MO / CO ₃ molar ratio are generally unstable and crystals such as MO are likely to precipitate.However, in the above reaction, the II-valent metal salt formed by decarboxylation of the basic carbonate and colloidal antimony pentoxide There amorphous react by heating at 50 to 100 ° C. colloidal antimonate salt is produced, such as MO to form agglomerates of the molar ratio of MO / CO ₃ is higher basic carbonate composite Precipitation of crystals is remarkably suppressed, and a high MO / CO ₃ molar ratio is maintained.

The primary particle size of the colloidal antimony pentoxide used
In the case of 2 mμ or less, the basic carbonate of the II-valent metal and the colloidal antimony pentoxide react in the entire amount and disappear, and are converted to an amorphous antimonate. Some remain. Therefore, the deodorant of the present invention can adsorb acidic odorous gas by the basic salt having a high MO / CO ₃ molar ratio contained therein, and has a basic property by the colloidal antimony pentoxide contained therein. It is believed that odor gases can be adsorbed and that the contained amorphous antimonate can adsorb organic solvents and acidic gases such as isovaleric acid.

When the molar ratio of MO / Sb ₂ O _{5 of the} mixed raw material is 0.5 or less, a deodorant having a high adsorption odor effect for acidic gas cannot be obtained, and when the molar ratio is 10 or more for the reaction, a deodorant having a high adsorption effect for basic gas is not obtained. Can not be obtained. Deodorant made from material mixture MO / Sb ₂ O ₅ molar ratio 1-8 show the most preferred adsorption effect.

When the molar ratio of CO ₃ / MO at the reaction end point is 1/5 or more, the effect of adsorbing a basic gas is small, and when it is 1/500 or less, the effect of adsorbing an acidic gas is small.

If the slurry temperature at the time of the reaction is 50 ° C. or lower, the formation of amorphous colloidal antimonate decreases, and the preferred deodorant of the present invention cannot be obtained. The higher this temperature is, the better,
If the temperature is higher than 100 ° C, a deodorant cannot be produced efficiently.
Also, when the heating time is 0.5 hour or less, the formation of the amorphous colloidal antimonate decreases, and when it is 20 hours or more, it is still inefficient. When the concentration of the slurry during the reaction is 1% by weight or less, it is not efficient, and when the concentration is 40% by weight or more, stirring of the slurry becomes difficult. Further drying temperature of 250
At a temperature of not less than ℃, the basic carbonate in the aggregate is easily decomposed, and at a temperature of not more than 150 ° C, water tends to remain in the deodorant. In particular, when the residual water content in the deodorant is set to 10% by weight or less, a powdery deodorant that is easy to handle can be obtained.

The use of basic zinc carbonate as the basic carbonate of the II-valent metal is preferable because the obtained deodorant is white, inexpensive, and safe and harmless to the human body.

The deodorant of the present invention may contain various surfactants, extenders, binders, etc. in addition to the above components.

〔Example〕

Hereinafter, the present invention will be described with reference to Examples and Comparative Examples. The scope of the present invention is not limited by these examples.

Example 1 An acidic aqueous sol of antimony pentoxide prepared by the method described in JP-A-61-227918 has a specific gravity of 1.141, a pH of 1.78, and a viscosity of 8.0.
cps, Sb ₂ O ₃ 13.5%, Na ₂ O 0.024%, Cl 120 ppm, particle size 1
The particle size was 5 to 25 mμ (observed by an electron microscope, hereinafter abbreviated as electron microscope particle size). Antimony pentoxide obtained this sol was dried had a result Sb ₂ O ₅ · 4H ₂ O crystalline structure of X-ray diffraction.

The acidic aqueous sol 1000g of antimony pentoxide, basic zinc carbonate (Sakai Chemical Co., Ltd. _{3ZnCO 3 · 4Zn (OH) 2} , in terms of ZnO 70 wt%) being stirred at room temperature for 1 hour was added 48.5g of Into a uniform slurry, and then at 90 ° C for 1 hour.
Aggregate slurry was obtained by stirring for an hour. This slurry has a specific gravity of 1.173 at a pH of 4.70, a viscosity of 1760 cps, and ZnO / Sb ₂ O
_The molar ratio was ₅ and the particle diameter was 1.3 μm. This aggregate was observed by electron microscopy to be an aggregate of colloidal particles of antimony pentoxide, zinc antimonate, and basic zinc carbonate.

The slurry was dried at 150 ° C. with a hot air drier and then pulverized with a pin disc mill to obtain a white powder of the deodorant of the present invention.

The average particle size of this powder is 4.5μ, the BET specific surface area is 89.0
m ² / g. The peak appears antimony pentoxide _{(Sb 2 O 5 · 4H 2} O) in the X-ray diffraction diagram of powders, the peak of the basic zinc carbonate was observed. But CO by elemental analysis
The analysis value of ₂ was 0.07% by weight, and it was clear that a very small amount of basic zinc carbonate remained. This powder is Sb ₂ O ₅ 68.
4% by weight, ZnO 17.0% by weight, ZnO / Sb ₂ O ₅ molar ratio 1.0, CO ₃ / Z
The nO molar ratio was 0.008.

Example 2 An acidic aqueous sol of antimony pentoxide prepared by the method described in JP-A-61-227918 was 13.0% Sb ₂ O ₅ , specific gravity 1.130,
Viscosity _{8.7cps, pH1.76, Na 2 O 0.028} %, Cl 130ppm, had physical properties of the electron microscopic diameter 5～10Emumyu. An aggregate slurry and a deodorant white powder of the present invention were obtained in the same manner as in Example 1, except that the antimony pentoxide sol was 1000 g and the basic zinc carbonate was 140.2 g.

The above slurry has a ZnO / Sb ₂ O ₅ molar ratio of 3.0 and a specific gravity of 1.18.
5. The viscosity was 1,300 cps, the pH was 6.79, and the particle diameter was 1.7 μm. In addition, electron microscopic observation revealed that the colloidal particles of antimony pentoxide, zinc antimonate, and basic zinc carbonate were aggregated. The average particle size of the powder is 4.2μ, BET
Law specific surface area of 86.5m ² / g, the X-ray diffraction diagram of the powder, antimony pentoxide _{(Sb 2 O 5 · 4H 2} O) with the peak of basic zinc carbonate appeared. The analysis value of CO ₂ by elemental analysis was 0.73%. This powder contains 50.4% by weight of Sb ₂ O ₅ , ZnO
38.0% by weight, ZnO / Sb ₂ O ₅ molar ratio 3.0, CO ₃ / ZnO molar ratio 0.03
It was 6.

Example 3 Acidic aqueous sol of antimony pentoxide used in Example 2
An aggregate slurry and a deodorant white powder of the present invention were obtained in the same manner as in Example 1 except that 1000 g and 233.6 g of basic zinc carbonate were used.

The ZnO / Sb ₂ O ₅ molar ratio of this slurry is 5.0, specific gravity 1.200,
The viscosity was 1,040 cps, the particle diameter was 1.9 µ, and the pH was 7.03. In addition, electron microscopic observation showed that the colloidal particles of antimony pentoxide, zinc antimonate, and basic zinc carbonate were aggregated. The average particle size of the powder 4.8Myu, BET method specific surface area of 84.6m ² / g, the X-ray diffraction pattern of this powder, antimony pentoxide _{(Sb 2 O 5 · 4H 2} O) and basic A peak of zinc carbonate appeared. The analysis value of CO ₂ by elemental analysis was 4.8%. The powder Sb ₂ O ₅ 37.1 wt%, ZnO 46.4 wt%, ZnO / Sb ₂ O ₅ molar ratio of 5.0, was CO ₂ / ZnO molar ratio 0.19.

Example 4 Acidic aqueous sol of antimony pentoxide used in Example 2
1000g and reagent primary basic copper carbonate (CuCO ₃・ Cu (OH) ₂・
An agglomerated slurry was obtained in the same manner as in Example 1 except that 61.4 g of H ₂ O, converted CuO 50.4% manufactured by Junsei Chemical Co., Ltd. was used.

This slurry had a pH of 5.04, a specific gravity of 1.195, a viscosity of 1410 cpu, and a Cu
The O / Sb ₂ O ₅ molar ratio was 1.0 and the particle size was 1.5 μm. Electron microscopic observation showed that the colloidal particles of antimony pentoxide, copper antimonate, and basic copper carbonate were aggregated.

After drying this slurry at 150 ° C with a hot air dryer,
It was pulverized with a pin disk mill to obtain a white powder of the deodorant of the present invention. The average particle size of this powder is 4.1μ, and the BET specific surface area is 8
2.1 m ₂ / g. The peak appears antimony pentoxide _{(Sb 2 O 5 · 4H 2} O) in the X-ray diffraction diagram of powders, the peak of the basic copper carbonate was observed. But by elemental analysis
The analysis value of CO ₂ was 0.08%, and a very small amount of basic copper carbonate remained. This powder contains 68.1% by weight of Sb ₂ O ₅ and CuO 1
6.7% by weight, CuO / Sb ₂ O ₅ molar ratio 1.0, CO ₃ / CuO molar ratio 0.009
Met.

Comparative Example 1 The acidic aqueous sol of antimony pentoxide obtained in Example 1 was dried at 150 ° C. with a hot air drier, and then pulverized with a pin dismill to obtain a white powder. The average particle size of this powder is 4.7
μ, BET specific surface area was 119 m ² / g.

Comparative Example 2 The basic zinc carbonate used in Example 1 was removed with a hot air drier.
Dried at 0 ° C. The average particle size of this powder is 4.4μ, BET
The specific surface area was 36.4 m ² / g.

Comparative Example 3 10 g of the acidic aqueous sol of antimony pentoxide obtained in Example 1 dried at 150 ° C. with a hot-air drier was used.
18 g of the basic zinc carbonate obtained in
A white powder having a molar ratio of / Sb ₂ O ₅ of 5.0 was obtained. This powder had an average particle size of 3.8 μm and a BET specific surface area of 53.3 m ² / g.

Comparative Example 4 Acidic aqueous sol of antimony pentoxide used in Example 2
To 1000 g, 46.7 g of basic zinc carbonate was added and stirred at room temperature for 2 hours to obtain a slurry, but the subsequent heating was not performed. This slurry had a ZnO / Sb ₂ O ₅ molar ratio of 1.0 and a pH of 4.72. The slurry was dried at 150 ° C. with a hot air drier and then pulverized with a pin disk mill to obtain a white powder. This powder had an average particle size of 5.1 μm and a BET specific surface area of 114 m ² / g.

(Evaluation of Deodorizing Performance) The deodorizing agents of Example 1 to Comparative Example 4 were tested by the following tests.

Test Method 1 Prepare an Erlenmeyer flask, attach a glass tube fitted with a silicone cap as a sampling port to a silicone rubber stopper, and seal the flask tightly. Next, a predetermined amount of an odorous gas is added to the air in the flask with a syringe, and the silicone stopper is once removed into the flask having a predetermined concentration, and 1 g of a deodorant is added. It was immediately stoppered again, quickly sampled with a syringe from the sampling port, and the concentration was measured by gas chromatography. The measured value here is used as the initial concentration. Thereafter, sampling was carried out at regular intervals with a syringe to measure the concentration of the odorous substance. The case where methyl mercaptan is used as the odorant is shown in Table-1.2, and the case where acetaldehyde is used as the odorant is shown in Table-3. The residual ratio in the table was determined by the following equation.

Residual rate (%) = (measured concentration at fixed time intervals / initial concentration) × 100 Test Method 2 The odorous gas of interest is obtained by putting the odorous component undiluted solution into an impinger and bubbling the odorous gas with air into a 200 plastic bag. However, for methyl mercaptan, a standard gas is introduced directly into the plastic bag from the cylinder.

Odor gas is released from this bag by air pump.
It is introduced into a 20 mmφ glass column and passed through a bed of adsorbent with a packed bed length of 3.5 cm. The flow rate of the introduced gas is adjusted by a regulator, and the flow rate and the integrated flow rate are measured by an integrating flow meter attached to the outlet side of the gas. In addition, a sample gas is collected from a sampling port provided before and after the column with a gas tight syringe, and the sample gas is analyzed by gas chromatography to measure the odorous gas concentrations at the inlet and outlet before and after the passage of the adsorbent. However, the concentration of only ammonia was measured with a detector tube.

1.0-4.0 / min (flow rate 0.053-0.212)
m / sec), the concentration of odorous gas at the inlet is 100-500ppm, so that the ratio of the outlet concentration (C) to the inlet concentration (Co) within 1 hour, C / Co is 0.1%, 10% breakthrough Let it reach.
The temperature was fixed at 20 ° C.

From this measurement result, the gas adsorption amount at 10% breakthrough point is M: Molecular weight of odorant t ₁ : Time to reach 10% breakthrough (mi
n) V: Ventilation flow rate (/ min) W: Adsorbent charge (g) Co: Inlet concentration (ppm), f (t): Breakthrough curve approximation T: Temperature (° C) To determine the odorant adsorption amount (g) per 1 g of the deodorant.

Table 4 shows the 10% breakthrough point adsorption determined by the above test method.

[Effect of the Invention] The deodorant of the present invention has an excellent effect of adsorbing acidic gas, basic gas, and organic solvent gas, ammonia, trimethylamine,
Basic gases such as triethylamine; acidic gases such as hydrogen sulfide, acetic acid, butyric acid, isovaleric acid, methyl mercaptan, ethyl mercaptan, methyl sulfide, and dimethyl disulfide; organic solvents such as toluene, ethyl acetate, methyl ethyl ketone, benzene, and acetaldehyde Gas: It is also effective for removing odorous gas such as cigarette odor and tar odor which is generated daily by adsorption. The deodorant of the present invention is used
Various colors can be provided by selecting the type of basic carbonate of the II-valent metal.

The deodorant of the present invention, paper, fiber, woven fabric, non-woven fabric, glass wool, ceramic fiber, ceramics, wood chips,
By supporting the slurry on a porous or non-porous molded article or sheet of plastic, metal or the like, it can be used as a deodorant in various forms. The supporting method can be easily obtained by impregnating or applying the above-mentioned material with the aggregate slurry of the present invention, the slurry of the deodorant, or the mixed slurry of the slurry and the resin emulsion, and then drying. In addition, the deodorant of the present invention can be supported on paper by adding the above slurry to the stock solution before papermaking and then papermaking. In the case of a fiber, the deodorant-containing fiber of the present invention can be obtained by adding the above-mentioned slurry or an organic solvent-dispersed slurry to the spinning solution during spinning and then spinning. Also, by mixing the powder at the time of molding the plastic, a plastic film sheet, a container or the like containing a deodorant can be produced.

Further, the deodorant of the present invention can be used by putting it in a breathable bag. Further, after adding the deodorant powder of the present invention and water, or a molding aid, press molding, extrusion molding, a known molding method such as tumbling granulation, granules, tablets,
Spherical, cylindrical, plate, rod, film, honeycomb,
After being formed into a shape such as a ribbon, the deodorant having the various shapes described above can be obtained by drying at room temperature to 250 ° C, preferably 150 to 250 ° C.

The deodorant of the present invention is used for odorous gas, solvent gas, etc. generated in chemical factories, resin processing plants, paint and adhesive manufacturing plants, paper mills, human waste processing plants, industrial waste processing plants, organic fertilizer plants, food factories, etc. Removal, animal barns, pets, sewage septic tanks, toilets,
Removal of odorous gas generated from garbage, removal of odor from cigarettes in automobiles, indoors, etc., removal of odorous gas generated from sanitary products, disposable diapers, shoe sole underlays, etc. Can be used widely.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-174932 (JP, A) JP-B-48-29478 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) B01J 20/00-20/34 B01D 53/34-53/34 136 A61L 9/01

Claims (2)

(57) [Claims] 1. An acidic aqueous sol of a basic carbonate of a II-valent metal and antimony pentoxide in a MO / Sb ₂ O ₅ (M represents a metal atom of a basic carbonate of a II-valent metal) molar ratio of 0.5 to 10 Into a uniform slurry, and at 50 ° C to 100 ° C, a CO ₃ / MO molar ratio of 1/5 to 1/500 until the basic carbonate of the above-mentioned II-valent metal in the slurry is decarboxylated. And then drying the slurry obtained by this reaction to obtain a deodorant. 2. The deodorant according to claim 1, wherein the basic carbonate of the II-valent metal is basic zinc carbonate.