Deodorant, excrement treatment material, and method for manufacturing deodorant

Abstract

To provide soybean pulp having a remarkable deodorizing effect on pet odors, especially ammonia odors, without using an adsorbent, a masking agent, or an antibacterial agent. [Solution] Defatted okara, which is obtained by adjusting the oil content to 5.0 wt% or less by dissolving and separating the oil contained in the okara, has a significant deodorizing effect on ammonia odor and can be used as a deodorizer. Furthermore, excrement treatment materials using this defatted okara as a deodorizing component can effectively deodorize ammonia odor, particularly the odor of cat excrement, without using adsorbents, masking agents, or antibacterial agents.

Description

[Technical Field]

[0001] The present invention relates to a deodorizer made from okara (soybean refuse) with enhanced deodorizing effect, and more particularly to a deodorizer made from defatted okara (soybean refuse), which is the residue of pressed soybeans, and which has been defatted to adjust the oil content of the okara, thereby significantly improving the deodorizing effect against malodorous components such as ammonia, and to an excrement treatment material using the same. [Background technology]

[0002] In recent years, as fossil fuel resources are becoming depleted and global environmental problems become more serious, the use of biomass has been promoted worldwide with the aim of preventing global warming by reducing waste and carbon dioxide emissions and creating a recycling-oriented society.

[0003] Okara, which is generated during the tofu manufacturing process, is considered a low-calorie and nutritious food ingredient, and is reused for purposes such as food, animal feed, marine bait, and fertilizer in accordance with the Act on Promotion of Recycling, etc. of Food Recycling Resources (Food Recycling Act).

[0004] However, because okara is rich in nutrients, it is prone to spoilage, and because it has a high moisture content of 75-85 wt%, it is heavy and bulky, resulting in high transportation costs. Currently, although some okara is recycled, much of it is disposed of as waste, and research is underway into how to make effective use of okara.

[0005] Dried soybean pulp has excellent water absorption and is water-soluble, so it can be flushed down the toilet, and has therefore been used as a base material for excrement treatment materials such as cat litter. For example, Patent Document 1 discloses an animal excrement treatment material made by granulating or molding a mixture of soybean pulp and an adhesive resin to form granular soybean pulp, which is then dried.

[0006] However, the deodorizing effect of dried soy pulp is not necessarily sufficient for the malodor originating from animal excrement. The excrement of pet animals such as cats and dogs generates malodors such as ammonia odor and mercaptan odor. Conventionally, in order to deodorize the malodor of feces and urine absorbed by dried soy pulp, it has been necessary to use adsorbents, masking agents such as fragrances, antibacterial agents, etc. However, from the viewpoint of environmental impact, it is preferable to use as few chemicals as possible.

[0007] Furthermore, dried soybean pulp itself emits an acidic odor derived from lower fatty acids and the like. Although this acidic odor is desirable from the viewpoint of suppressing ammonia odor, it is unpleasant for pet animal keepers, and improvements have been desired.

[0008] For these reasons, there has been a demand for soy pulp that has a significant deodorizing effect on ammonia odor, particularly cat excrement odor, without using adsorbents, masking agents, antibacterial agents, etc. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 5694678 Summary of the Invention [Problem to be solved by the invention]

[0010] In view of the above-mentioned conventional drawbacks, the present invention is based on a novel concept and aims to provide soy pulp that has a significant deodorizing effect on pet odors, particularly ammonia odors, without using any adsorbents, masking agents, or antibacterial agents. [Means for solving the problem]

[0011] In view of the above object, as a result of intensive research, the present inventors discovered that defatted soybean pulp obtained by separating oil from soybean pulp has a significant deodorizing effect, and arrived at the present invention. That is, the object of the present invention can be achieved by the following configuration.

[0012] The first invention is a deodorant comprising defatted soy pulp having an oil content of 5.0 wt% or less as calculated on bone dry weight.

[0013] A second aspect of the present invention is a deodorizer, wherein the moisture content of the defatted soy pulp is 20 wt % or less.

[0014] The third aspect of the present invention is the defatted soy pulp having a specific surface area of ​​1.0 m 2 / g or more.

[0015] The fourth invention of the present invention is an excrement treating material characterized in that a deodorizing agent made of defatted soybean pulp having an oil content of 5.0 wt% or less calculated as bone dry weight is carried on the surface thereof.

[0016] The fifth invention of the present invention is an excrement treating material characterized by containing a deodorizing agent made of defatted soybean pulp having an oil content of 5.0 wt% or less as calculated on bone dry weight.

[0017] The sixth invention of the present invention is a method for producing a deodorizer made from defatted soy pulp, characterized in that the oil contained in the soy pulp is eluted and separated using an organic solvent to produce a deodorizer made from defatted soy pulp having an oil content of 5.0 wt% or less, calculated as bone dry weight. [Effects of the Invention]

[0018] According to the first aspect of the present invention, by making the oil content of defatted soy pulp pulp 5.0 wt% or less, calculated as bone dry weight, a deodorizer that effectively eliminates malodors including ammonia odor can be obtained.

[0019] According to the second aspect of the present invention, by setting the moisture content of the defatted soy pulp to 20 wt % or less, it is possible to prevent putrefaction and mold growth of the defatted soy pulp.

[0020] According to the third aspect of the present invention, the specific surface area of ​​the defatted soy pulp is 1.0 m 2 / g or more, a deodorant that effectively eliminates malodors including ammonia odor can be obtained.

[0021] According to the fourth aspect of the present invention, by supporting defatted soy pulp having an oil content of 5.0 wt% or less, calculated on an absolute dry weight basis, on the surface of the excrement treatment material, an excrement treatment material having a remarkable deodorizing effect on ammonia odor, particularly cat excrement odor, can be obtained.

[0022] According to the fifth aspect of the present invention, by incorporating defatted soy pulp having an oil content of 5.0 wt% or less, calculated on an absolute dry weight basis, into an excrement treatment material, an excrement treatment material having a significant deodorizing effect on ammonia odor, particularly cat excrement odor, can be obtained.

[0023] According to the sixth aspect of the present invention, defatted okara can be produced efficiently and simply by eluting and separating the oil contained in okara using an organic solvent. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a stereomicroscope photograph (200x magnification) of dried okara, which is obtained by drying raw okara generated in the tofu manufacturing process. [Figure 2] FIG. 1 is a graph showing ammonia concentration changes in Examples 1 to 3 and Comparative Examples 1 and 2. [Figure 3] FIG. 1 is a graph showing ammonia concentration changes in Example 4 and Comparative Example 3. DETAILED DESCRIPTION OF THE INVENTION

[0025] The deodorizer and excrement treatment material made from defatted soybean pulp are described in detail below. In this specification, "soybean pulp" is defined as soybean pulp obtained by squeezing soy milk from whole soybeans, as well as soybeans for processing such as defatted soybeans.

[0026] In this specification, "particle size" is defined as the particle size measured using dried soybean pulp. "Particle size" refers to the volume-average particle size measured by laser light scattering (laser diffraction), and "average particle size" refers to the median diameter D50.

[0027] In addition, the oil content (oil content) in this specification is defined as the value measured by the chloroform / methanol mixed liquid extraction method described in the Analysis Manual for the Standard Tables of Food Composition in Japan.

[0028] (1) Defatted soybean pulp The deodorizer of the present invention is made of defatted soy pulp adjusted to an oil content of 5.0 wt% or less, calculated on an absolute dry weight basis. If the oil content of the defatted soy pulp exceeds 5.0 wt%, the deodorizing performance will be insufficient, which is undesirable. The oil content of the defatted soy pulp is preferably 3.0 wt% or less, more preferably 2.0 wt% or less, and particularly preferably 1.0 wt% or less.

[0029] The specific surface area of ​​defatted soy pulp is 1.0m 2 / g or more, and 1.1m 2 It is more preferable that the specific surface area of ​​the defatted soy pulp is 1.0 m / g or more. 2 If it is less than 1 / g, the deodorizing effect may not be sufficient, which is not preferable.

[0030] The particle size of the defatted soy pulp is not particularly limited, but it is preferable that the average particle size is 20 μm or more and 1000 μm or less. If the average particle size exceeds 1000 μm, degreasing will be insufficient, and the deodorizing performance may gradually decrease when the deodorizer is stored for a long period of time, which is not preferable. Furthermore, if the average particle size is less than 20 μm, dust will fly and the deodorizer will become bulky, which is not preferable. In the present invention, the particle size of the defatted soy pulp can be adjusted appropriately depending on the application of the deodorizer.

[0031] In order to prevent the generation of unpleasant odors due to mold or decay, the defatted okara is preferably in a dry powder form. The moisture content of the defatted okara is preferably 20 wt% or less, more preferably 10 wt% or less, and more preferably 5.0 wt% or less.

[0032] The defatted soybean pulp prepared as described above can be used as a deodorizer as it is, since it effectively deodorizes malodors including ammonia odor.

[0033] (2) Manufacturing method of defatted soy pulp The method for producing defatted soy lees is not particularly limited, and any known degreasing method can be applied. As a preferred example, a method for producing defatted soy lees by defatting soy lees with an organic solvent and drying the defatted soy lees will be described.

[0034] (Raw material: Okara) From the viewpoint of biomass reduction, it is preferable to use raw okara, which is the residue remaining after soy milk is extracted from whole soybeans, as the raw material for defatted okara. Raw okara is composed of proteins, oils, carbohydrates, dietary fiber, ash, moisture, etc., and typically contains 75 to 85 wt% moisture. In the present invention, raw okara may be defatted as is, or dried okara obtained by drying raw okara may be defatted.

[0035] The okara particles generated in the tofu production process vary in size, as shown in Figure 1. If the degreasing effect is insufficient without pulverization, the okara can be pulverized before the degreasing treatment. Grinding of the okara can be carried out by either a dry method or a wet method.

[0036] The component composition of okara varies depending on the tofu manufacturer, but the dry content of normal okara is within the following ranges:

[0037] Protein: 20wt% to 25wt% Oil content: 10wt% or more and 18wt% or less Carbohydrates: 5wt% to 10wt% Dietary fiber: 43wt% to 55wt% Ash content 3wt% or more and 4wt% or less Water 1wt% or more and 8wt% or less

[0038] As described above, since okara contains a large amount of oil, the oil contained in the okara is removed by the degreasing treatment described below.

[0039] (Degreasing treatment) Okara is converted into defatted okara by dispersing it in an organic solvent, stirring it under heating, and then drying it. Examples of the organic solvent that can be used include ethanol, methanol, hexane, ethyl acetate, acetone, and chloroform. It is preferable to use a single organic solvent or a mixed organic solvent from these organic solvents.

[0040] The heating temperature during the degreasing treatment is preferably between room temperature and about 60°C, and stirring is carried out for about 1 to 10 hours. Treatment at too high a temperature is not preferred, as the organic solvent will volatilize. If desired, the degreasing treatment is carried out about 1 to 5 times, with the organic solvent being replaced. After the degreasing treatment, the okara is dried to prepare defatted okara.

[0041] The organic solvent fraction obtained as a by-product of the degreasing process contains soybean-derived oil. The oil obtained by removing the organic solvent from the organic solvent fraction can be used as a biodiesel feedstock. Furthermore, the obtained oil can be further refined and used as soybean oil.

[0042] (3) Excrement treatment materials The deodorizer made from the defatted soy pulp of the present invention can effectively deodorize malodors including ammonia odor, and therefore, by supporting the defatted soy pulp on the surface of an excrement treatment material or by using the defatted soy pulp as the base material of the excrement treatment material, an excrement treatment material with a high deodorizing effect can be provided.

[0043] (Excrement treatment material carrying defatted soy pulp) When the defatted okara is to be supported on the surface of an excrement treatment material, the defatted okara is mixed with the excrement treatment material to adhere the defatted okara to the surface of the excrement treatment material. The excrement treatment material to be used is not particularly limited, and may be made from okara, paper, mineral, wood, silica gel, or any other known excrement treatment material. The average particle size of the defatted okara supported on the surface of the excrement treatment material is preferably 100 μm or less, more preferably 50 μm or less. An average particle size exceeding 100 μm is undesirable because the supported defatted okara is likely to fall off from the excrement treatment material.

[0044] When defatted soybean pulp is supported on the surface of the excrement treating material, it is preferable that the excrement treating material support defatted soybean pulp in an amount of 3 wt % or more, preferably 5 wt % or more.

[0045] (Excrement treatment material containing defatted soy pulp) When defatted soy pulp is used as the base material for an excrement treatment material, the excrement treatment material can be produced by mixing a thermoplastic resin with the base material containing defatted soy pulp to prepare a granulation mixture adjusted to the moisture content required for granulation, and granulating this granulation mixture using a granulation device.

[0046] The defatted okara is preferably blended in a proportion of 10 wt% or more in the base material. If the content of defatted okara is less than 10 wt%, the deodorizing effect may be insufficient, which is not preferred. Preferably, the content of defatted okara in the base material is 30 wt% or more. A base material containing defatted okara may be blended with a plant fiber material other than defatted okara. As the plant fiber material other than defatted okara, it is preferred to blend so-called normal okara that has not been defatted, but pulp, wood flour, cellulosic fiber, cotton, or waste materials thereof may also be blended.

[0047] The excrement treatment material preferably has the property of becoming wet after use, allowing particles of the excrement treatment material to adhere to each other through adhesion and form clumps. To promote adhesion of the excrement treatment material particles to each other, it is preferable to use a water-absorbent resin with adhesive properties as the thermoplastic resin used in the granulation mixture. Examples of such water-absorbent resins with adhesive properties include saponified copolymers of vinyl esters and ethylenically unsaturated carboxylic acids or their derivatives, graft polymers of starch and acrylic acid, crosslinked polyacrylic acid, copolymers of vinyl alcohol and acrylic acid, partial hydrolysates of polyacrylonitrile, crosslinked carboxymethylcellulose, chitosan salts, pullulan gels, etc.

[0048] In the granulation mixture, the amount of thermoplastic resin is preferably 5.0 wt% or less, more preferably 3.0 wt% or less, and even more preferably 1.0 wt% or less. If the amount of thermoplastic resin exceeds 5.0 wt%, the shape stability of the granulated particles may be impaired when absorbing water, which is undesirable.

[0049] In one embodiment, the excrement treatment material of the present invention may contain additional components such as a bactericide in addition to the substrate and thermoplastic resin. Typical bactericidal components used in excrement treatment materials include table salt, sorbic acid or its salts, calcium propionate, sodium hypochlorite, benzoic acid or its salts, or a mixture of two or more thereof.

[0050] In one embodiment, the excrement treatment material of the present invention does not contain any deodorizer other than defatted soy pulp refuse. Common deodorizers used in excrement treatment materials include pulp re-burning incineration ash, vermiculite, perlite, activated carbon, silica gel, wood vinegar, bamboo vinegar, roasted coffee bean extraction residue or used tea leaves, zeolite, bentonite, catechins, chalcones, flavanones, flavones, flavonols, flavanonols, flavanols, isoflavones or anthocyanins, Japanese cypress oil, hinokitiol, hinokitiol-containing wood flour such as Japanese cypress and Japanese cypress, and mixtures of two or more of these.

[0051] The lower the moisture content of the excrement treating material of the present invention, the more effectively it can suppress the growth of mold. The moisture content of the excrement treating material is preferably 12 wt% or less, more preferably 10 wt% or less, and even more preferably 8 wt% or less. [Example]

[0052] The present invention will be described in more detail by the following examples, but the present invention is not limited to these examples.

[0053] Example 1 (Raw material: Okara) Raw okara produced in a tofu factory was dried at 105°C for 12 hours to a moisture content of 3.7%. Analysis of the dried raw okara revealed that it contained 12.2 wt% oil, 21.5 wt% protein, 9.7 wt% carbohydrates, 49.3 wt% dietary fiber, and 3.6 wt% ash.

[0054] This dried raw okara was pulverized using a pulverizer and used as the raw okara. The average particle size of this raw okara was measured using a laser diffraction / scattering particle size distribution analyzer (manufactured by Horiba, Ltd., device name: LA-960) and found to be 47.8 μm. The oil content of this raw okara was 13.2 wt%.

[0055] (Degreasing treatment) 3 g of raw soy pulp was placed in 60 ml of a chloroform-methanol mixture (chloroform:methanol = 2:1) and stirred at 60°C for 1 hour with a condenser attached. The resulting soy pulp suspension was subjected to suction filtration to separate the oil contained in the pulp. The chloroform-methanol mixture was replaced, and the same degreasing process was repeated twice.

[0056] The obtained defatted soy pulp was dried at 105°C for 12 hours to adjust the moisture content to 4.0 wt%, which was used as Example 1. The oil content of the defatted soy pulp of Example 1 was 0.0 wt% (below the detection limit).

[0057] Example 2 (Raw material: Okara) The soybean pulp with an average particle size of 47.8 μm prepared in Example 1 was sieved several times through sieves with a mesh size of 100 to 500 to prepare raw soybean pulp with an average particle size of 32.0 μm. When this raw soybean pulp was analyzed, the oil content was found to be 14.3 wt%.

[0058] (Degreasing treatment) This raw soybean pulp was defatted twice using a chloroform-methanol mixture in the same manner as in Example 1. The resulting defatted soybean pulp was dried at 105°C for 12 hours to adjust the moisture content to 3.9 wt%, which was used as Example 2. The oil content of the defatted soybean pulp in Example 2 was 0.0 wt% (below the detection limit).

[0059] Example 3 3 kg of the raw material soybean pulp prepared in Example 1 was stirred in 30 L of methanol at 60°C for 1 hour. The resulting soybean pulp suspension was subjected to suction filtration to separate the oil contained in the soybean pulp. The methanol was replaced, and the same degreasing treatment was repeated twice.

[0060] The obtained defatted soy pulp was dried at 105°C for 12 hours to adjust the moisture content to 4.0 wt%, which was used as Example 3. The oil content of the defatted soy pulp of Example 3 was 2.6 wt%.

[0061] Example 4 (Raw material: Okara) Raw okara with different oil contents produced in a tofu factory different from that used in Example 1 was dried at 105°C for 12 hours to a moisture content of 4.0% and used as raw okara. Component analysis of this raw okara revealed that the oil content was 15.8 wt%.

[0062] The average particle size of this raw material okara was measured using a laser diffraction / scattering particle size distribution measuring device (manufactured by Horiba Ltd., device name: LA-960) and was found to be 510 μm.

[0063] (Degreasing treatment) This raw soybean pulp was defatted twice using a chloroform-methanol mixture in the same manner as in Example 1. The resulting defatted soybean pulp was dried at 105°C for 12 hours to a moisture content of 4.1 wt%, which was designated Example 4. The oil content of the defatted soybean pulp in Example 4 was 1.0 wt%.

[0064] [Ammonia deodorization test] Next, an ammonia deodorization test was carried out by the gas detection tube method for the defatted soy pulverized okara of Examples 1 to 4. For comparison, the dried raw soy pulverized okara of Example 1 was used as Comparative Example 1, the raw soy pulverized okara of Example 1 (dried raw soy pulverized okara pulverized to an average particle size of 47.8 μm) was used as Comparative Example 2, and the dried raw soy pulverized okara of Example 3 was used as Comparative Example 3.

[0065] 1.0 g of the test sample (okara) was placed in a 500 ml gas collection bottle, and ammonia gas was introduced so that the initial concentration was 400 ppm. The ammonia concentration was measured using a gas detector tube (Gastec, model numbers: 3M and 3La). For comparison, an empty gas collection bottle was also prepared in which ammonia gas was introduced in the same manner (hereinafter referred to as a blank).

[0066] The ammonia concentration in the gas collection bottle was measured a predetermined time after the introduction of ammonia gas, and the results are shown in Table 1. The changes in ammonia concentration in Examples 1 to 3 and Comparative Example 1 are shown in Figure 2, and the changes in ammonia concentration in Example 4 and Comparative Example 3 are shown in Figure 3.

[0067] [Table 1]

[0068] In Examples 1 to 4, the ammonia concentration rapidly decreased, reaching 50 ppm or less after 10 minutes. On the other hand, the undefatted soybean pulp in Comparative Examples 1 to 3 had an ammonia deodorizing effect, but the ammonia deodorizing effect was insufficient, with the concentration remaining at 75 ppm to 250 ppm even after 10 minutes.

[0069] [Measurement of specific surface area of ​​okara] The specific surface area of ​​the okara was measured by evacuating it to a vacuum at 40°C for 24 hours, and then calculating it at liquid nitrogen temperature using the BET three-point method from the amount of krypton adsorbed at pressures of 0.1, 0.2, and 0.3. The krypton-occupied area was 0.205 nm 2 The specific surface area of ​​each okara is shown in Table 2. In Table 2, those with an ammonia concentration of 50 ppm or less after 10 minutes in the ammonia deodorization test described above were judged to be "suitable" as deodorizers.

[0070] [Table 2]

[0071] The results in Table 2 show that the specific surface area of ​​okara increases through degreasing. Comparing the specific surface areas of Example 1 and Comparative Example 2, and Example 4 and Comparative Example 3, it is clear that removing oil from okara to the detection limit easily increases the specific surface area by more than two times. The results in Table 2 suggest that the specific surface area of ​​okara increases through degreasing, and that the larger the specific surface area, the greater the deodorizing effect.

[0072] In the case of activated carbon and coffee beans, which are standard deodorizers, a high deodorizing effect is imparted to the biomass by a burning process, but according to the present invention, the deodorizing effect can be improved by a degreasing process.

[0073] Example 5 (Production of animal waste treatment materials) A ball mill was charged with 70 parts by weight of the defatted soy pulp from Example 3, 3 parts by weight of an adhesive water-absorbent resin, Hymosub HS-1100 (manufactured by Hymo Co., Ltd.), and 27 parts by weight of water to prepare a kneaded material for granulation. The kneaded material for granulation was fed to an extrusion-type granulator and granulated into particles with a diameter of 4 mm and a length of 10 mm. These particles were dried with hot air at a temperature of 80°C or higher until the moisture content reached 10 wt%, yielding an animal waste treatment material. The obtained animal waste treatment material had no noticeable acidic odor characteristic of the lower fatty acids of soy pulp.

[0074] The obtained animal excrement treatment material was laid to a depth of 7 cm in a commercially available cat litter box and used for cat excretion. The material had good water absorption and deodorizing properties, and the smell of urine was hardly noticeable in the room.

[0075] Example 6 (Production of animal waste treatment materials) An animal excrement treatment material was produced in the same manner as in Example 5, except that 35 parts by weight of the defatted soybean pulverized okara of Example 3, 35 parts by weight of the soybean pulverized okara of Comparative Example 1, 3 parts by weight of an adhesive water-absorbent resin, Hymosub HS-1100 (manufactured by Hymo Co., Ltd.), and 27 parts by weight of water were charged into a grinder to prepare a kneaded material for granulation. The obtained animal excrement treatment material had almost no detectable acidic odor characteristic of the lower fatty acids of soybean pulverized okara.

[0076] The obtained animal excrement treatment material was laid to a depth of 7 cm in a commercially available cat litter box and used for cat excretion. The material had good water absorption and deodorizing properties, and the smell of urine was hardly noticeable in the room.

[0077] Example 7 (Production of animal waste treatment materials) An animal excrement treatment material was prepared in the same manner as in Example 5, except that the okara of Comparative Example 1 was used instead of the defatted okara of Example 3. The obtained animal excrement treatment material had a distinctive acidic odor derived from the okara. Furthermore, when the animal excrement treatment material was used for cat excrement in the same manner as in Example 5, the water absorbency was good, but the smell of cat urine was detected indoors.

[0078] 1 kg of this animal excrement treatment material was mixed and stirred with 30 g of the defatted soy pulp from Example 2 to prepare an animal excrement treatment material with defatted soy pulp powder supported on its surface, which was designated as the animal excrement treatment material of Example 7. When the animal excrement treatment material of Example 7 was used for cat excrement in the same manner as in Example 5, no cat urine odor was detected indoors. This demonstrates that the deodorizing effect of the animal excrement treatment material is improved by supporting a deodorizing agent made from the defatted soy pulp of the present invention on the surface of the animal excrement treatment material. [Industrial Applicability]

[0079] As explained above, the deodorizer made from the defatted soy pulp of the present invention has the effect of instantly deodorizing the ammonia odor, and can therefore be used as a deodorizer in a variety of situations. For example, the defatted soy pulp can be used as a room deodorizer as is, or by adding the defatted soy pulp to resin or the like, it can be used as a material for food storage bags or building wallpaper.

[0080] Furthermore, excrement treatment materials using defatted soy lees are effective in eliminating urine odors, particularly cat excrement odors, without the need for adsorbents, masking agents, or antibacterial agents.

Claims

1. A deodorizer made from soy pulp, A deodorizer comprising defatted soybean pulp having an oil content of 5.0 wt % or less as calculated by bone dry weight.

2. 2. The deodorizer according to claim 1, wherein the moisture content of the defatted soy pulp is 20 wt % or less.

3. The specific surface area of ​​the defatted soy pulp is 1.0 m ２ 2. The deodorant according to claim 1, wherein the molecular weight of the deodorant is 1 / g or more.

4. The excrement treatment material is characterized in that a deodorizing agent made of defatted soybean pulp having an oil content of 5.0 wt % or less as calculated by bone dry weight is carried on the surface of the excrement treatment material.

5. An excrement treatment material characterized by containing a deodorizing agent made of defatted soybean pulp having an oil content of 5.0 wt % or less as calculated by bone dry weight.

6. A method for producing a deodorizer, characterized in that the deodorizer is produced from defatted soybean pulp having an oil content of 5.0 wt% or less, calculated as bone dry weight, by eluting and separating oil contained in soybean pulp using an organic solvent.

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