JPH0726281A - Deodorization of oil - Google Patents

Abstract

PURPOSE:To effectively and safely remove or prevent the malodor of oil to thereby deodorize the oil. CONSTITUTION:A deodorant 1 enclosed in a container 2 having an oil passage hole is placed in an oil 12, such as a hydraulic oil or a lubricating oil. The deodorant 1 comprises a porous silica gel having on the surface of the pores an aluminosilicate coating containing antibacterial metal ions. The ions tend to diffuse rapidly in the pores so that they will contact bacteria at a large area of contact therewith.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating oil used in a hydraulically operated machine or the like, and a lubricating oil used to smooth material operation such as cutting or operation of each part of the machine. The present invention relates to an oil deodorizing method for removing the cause of bad odor, bacteria, etc. that have occurred to remove the bad odor of oil.

[0002]

2. Description of the Related Art Generally, for example, when metal cutting is performed, a lubricating oil having a lubricating property and a cooling property is supplied from a tank in order to protect a cutting tool and improve the quality of a processed product. Spraying is performed on the processing part. Further, for example, in a hydraulically operated machine such as a hydraulic elevator, oil is used as a working fluid, and a car is raised by pressure oil supplied from a tank and pressurized by a pump.

However, these working or lubricating oils absorb moisture for some reason while they are placed in a tank or the like and used, and as a result, bacteria such as bacteria propagate these oils as nutrients. , Will start to produce a foul odor. In addition, when these oils are used for many years, they may deteriorate due to oxidation or the like to generate a malodorous gas such as paraffin hydrocarbon. On the other hand, if an antioxidant or a rust preventive agent is added to prevent the deterioration of the oil, and an anti-wear agent is added, gas such as aromatic hydrocarbon or sulfide is generated by these additives as a factor. It may occur and, on the contrary, may give off a foul odor. The bad odor generated by these causes adversely affects the working environment and also gives the user of a hydraulic machine such as a hydraulic elevator an unpleasant feeling. Therefore, it is necessary to prevent or remove it.

In order to remove or prevent the bad smell of oil, it is conceivable to replace the oil itself, but this is very laborious and expensive. Therefore, as a method for deodorizing oil, tap water that has been sterilized when diluting an undiluted oil solution or a preservative such as an antioxidant or a rust preventive has been conventionally used. .

[0005]

However, the conventional techniques using sterilized tap water do not always have a sufficient deodorizing effect and cannot maintain the deodorizing effect for a long period of time. In addition, the conventional method using a preservative cannot maintain its effect for a long period of time because the durability in oil is low and the preservative must be replenished periodically. Furthermore,
In this method, sufficient effect cannot be exhibited unless a large amount of preservative is used, but on the other hand, since it is highly irritating and has a large effect on the human body, only a small amount can be used as a result. The deodorizing effect could not be expected. Further, these antiseptics may rather cause a bad odor as described above.

In particular, conventionally, there have been few attempts to deodorize an oil by adding a deodorant instead of an antiseptic such as an antioxidant, and even if the deodorant deodorizes the oil, Due to such properties as low durability, it is impossible to effectively deodorize in oil for a long period of time, and there is no method for effectively deodorizing oil by applying a deodorant to the oil. In addition, since an organic deodorant is highly toxic, deodorizing oil using it has a problem in terms of safety. Furthermore, when using a deodorant, how to arrange it in oil was also a problem.

An object of the present invention is to provide a method for deodorizing oil which avoids the above-mentioned drawbacks and can effectively and safely prevent or remove the malodor of oil. Moreover, it aims at providing the deodorizing method of the oil which can maintain this effective and safe deodorizing effect over a long period of time.

[0008]

As a first means for solving the above problems, the present invention provides a thin film of aluminosilicate containing a bactericidal metal ion in oil for working or lubricating. Provided is a method for deodorizing oil, which comprises deodorizing an oil by adding a deodorant composed of silica gel having pore surfaces, in which case the deodorant is stored in a container having oil passage holes and placed in the oil. It is effective that they are arranged.

The present invention also provides, as a second means for solving the above-mentioned problems, a deodorizing agent composed of an aggregate of particles of zinc oxide, titanium dioxide and water in close-bonded particles in oil for operation or lubrication. An oil deodorizing method is characterized by adding an agent to deodorize the oil, and in this case also, it is effective that the deodorizing agent is housed in a container having an oil passage hole and arranged in the oil. Target.

Further, according to the present invention, as a third means for solving the above-mentioned problems, a tightly coupled body of zinc oxide and one of aluminum oxide and silicon oxide in an oil for operation or lubrication. Provided is a method for deodorizing oil, which comprises deodorizing oil by adding a deodorant consisting of an aggregate of particles.
In this case as well, it is effective that the deodorant is housed in a container having an oil passage hole and arranged in the oil.

Finally, according to the present invention, as a fourth means for solving the above-mentioned problems, oil for operation or lubrication is used.
A method for deodorizing oil, which comprises deodorizing an oil by adding a deodorant comprising a mixture of 0 to 98% by weight of anion exchange resin and 50 to 2% by weight of cation exchange resin,
Also in this case, it is effective that the deodorant is housed in a container having an oil passage hole and arranged in the oil.

[0012]

As described in the first means, when the oil is deodorized using the deodorant obtained by coating the aluminosilicate containing the bactericidal metal ion as the supporting substrate of silica gel, the silica gel has many pores. Since the surface area is large, the bactericidal metal ions diffuse rapidly in the pores, and the contact area between the bactericidal metal ions and the bacteria increases, so that the oil can be effectively deodorized by sterilization. Since the deodorant is an inorganic type, the oil can be safely deodorized. Furthermore, since this silica gel and the aluminosilicate containing metal ions are chemically bonded, even if placed in oil, it will not be pulverized and deteriorate, and the deodorizing effect due to its sterilization will be maintained for a long time. can do.

Further, as shown in the above-mentioned second means, when a deodorant consisting of an aggregate of zinc oxide, titanium dioxide and a tightly bound particle of water is added to deodorize the oil, the bad smell of the oil is effectively obtained. It is possible to adsorb gas for deodorization, and since this deodorant is composed of zinc oxide, titanium dioxide and water, which have low toxicity, it is possible to safely deodorize oil.

Further, as shown in the third means, an oil is prepared by adding a deodorant consisting of an aggregate of particles of tightly bound particles of zinc oxide and one or both of aluminum oxide and silicon oxide. When deodorized, the malodorous gas of oil can be effectively adsorbed to achieve deodorization. In addition, this deodorant consists of zinc oxide, aluminum oxide, and silicon oxide, which have low toxicity, so it can safely deodorize oil. be able to.

Finally, as shown in the fourth means, 5
When an oil is deodorized by adding a deodorant composed of a mixture of 0 to 98% by weight of anion exchange resin and 50 to 2% by weight of cation exchange resin, the anion exchange resin removes malodorous gas and the anion exchange resin Since the cation exchange resin adsorbs another malodorous gas that may be released, the malodorous gas of the oil can be effectively removed and deodorized.
Since this deodorant is composed of an anion exchange resin and a cation exchange resin having low toxicity, oil can be safely deodorized.

In the above first to fourth means,
When the deodorant is stored in the container, it can be placed at a position where it can most effectively exert the deodorizing effect without precipitation in the oil, and the container has an oil passage hole. Since it is provided, the oil to be deodorized can contact these deodorants arranged in the container, so that the oil can be effectively deodorized.

[0017]

EXAMPLE A first example of the present invention will be described in detail. In this example, an aluminosilicate film containing a germicidal metal ion in oil for working or lubricating is used on the surface of pores. A deodorant composed of silica gel is added to deodorize oil for working or lubricating.

Silica gel is produced by drying a white gel-like precipitate formed by adding hydrochloric acid to an alkali silicate aqueous solution. This silica gel is an amorphous porous material containing SiO ₂ as a main component, has a large number of pores inside, and has a large surface area. For this reason, when silica gel is used as a supporting substrate for aluminosilicate containing a bactericidal metal ion, the contact area between the bactericidal metal ion and bacteria such as bacteria increases, the reaction rate to bacteria increases, and the sterilization is effective. Deodorization of oil can be performed.

Therefore, it is preferable that the silica gel used in the present invention has a large number of pores developed therein and has a large pore volume, pore diameter and surface area. Specifically, the pore volume is at least 0.3 cm ² / g or more, the pore diameter is at least 50 Å or more, and the surface area is at least 100 m ² / g.
It is desirable to use more than g silica gel. In addition, since silica gel having such a large pore volume and large surface area is extremely porous and the surface of the pores is extremely active, the use of such silica gel forms a thin film of aluminosilicate as described later. When the bactericidal metal is formed on the active surface of the pores and stably held by ion exchange, diffusion of metal ions is rapidly performed, and chemical reaction is smoothly performed on the pore surface of silica gel. Although silica gel has various shapes such as powder and particles, it is preferable to use a fine shape in consideration of reactivity when it is produced as a deodorant by a chemical treatment described later.

Examples of the bactericidal metal ions include silver,
Any one kind or a combination of two or more kinds of copper, zinc, mercury, tin, lead, bismuth, cadmium and chromium can be used, but the deodorizing action by sterilization is effectively exhibited in the oil which is liquid. For this purpose, it is desirable to use silver or zinc or a composite of silver and zinc. As described above, since the first embodiment uses the bactericidal metal ion, it is particularly effective for the malodor caused by bacteria.

Aluminosilicate is mainly composed of Al ₂ O ₂ and Si.
It is possible to use those which are composed of O ₂ and a base and have a SiO ₂ / Al ₂ O ₂ molar ratio in the range of 1.4 to 40. The film made of this aluminosilicate may be crystalline or amorphous, or a film in which both are present can be used.

The deodorant is produced by coating the above-mentioned porous silica gel with an aluminosilicate and then supporting sterilizing metal ions in the aluminosilicate coating by ion exchange. Specifically, first, the porous silica gel is chemically treated with an alkali solution and an aluminate solution at room temperature or under heating to react SiO ₂ existing on the surface of the pores of the silica gel to form aluminosilicate. A film is formed around the active surface of the pores. In this case, as the alkaline solution, for example, NaOH, KO
A solution of an alkali metal hydroxide such as H or LiOH can be used. Also, as the aluminate solution,
For example, NaAlO ₂ , KAlO ₂ . An alkali metal aluminate solution such as LiAlO ₂ can be used.

Next, the chemically treated silica gel is washed with water by a batch method or a currum method to remove excess alkali and metal components present in the solid phase, and then the salt containing the bactericidal metal ion is removed. Treated with a neutral to slightly acidic solution, the sterilizing metal ion is ion-exchanged with the ion-exchangeable metal M in the aluminosilicate film at room temperature or under heating to ion bond the sterilizing metal ion. To hold it stably in the aluminosilicate film. The neutral or slightly acidic solution of salts containing bactericidal metal ions includes, for example, nitrates, sulfates, hydrochlorides, etc. (When silver or zinc is used as bactericidal metal ions, silver acetate or Zinc acetate) can be used. Finally, the silica gel that has undergone such treatment is washed with water until no bactericidal metal ions are observed, and then dried at 100 to 110 ° C to produce a deodorant.

As described above, since the aluminosilicate containing the bactericidal metal ion is chemically and stably bound to the silica gel as the supporting substrate, it does not deteriorate in the oil and its effect is maintained for a long time. The deodorizing effect due to effective sterilization can be maintained. Since this deodorant is an inorganic type, it has low toxicity and can safely deodorize oil. At the time of ion exchange, the concentration and composition of the neutral or slightly acidic solution of salts containing bactericidal metal ions, and the reaction temperature and time of ion exchange are adjusted so that the total amount of bactericidal metal is the surface area of the deodorant. At least 0.00 per 100 m ²
When the amount is 3 millimoles, preferably 0.005 millimoles or more, it is formed by products such as oxides and basic salts generated by hydrolysis of bactericidal metal ions contained in the aluminosilicate film. Further, it is possible to prevent the aluminosilicate film from being contaminated and its bactericidal action being lowered.

As the ion-exchangeable metal M of the aluminosilicate film, an alkali metal such as lithium, sodium or potassium is mainly used, and the amount of this alkali metal is determined by the concentration of the aluminate solution and the reaction. By adjusting the time, reaction temperature, etc.
It is desirable that the amount is 2.57 mmol or less per gram.
This is because when the amount of the alkali metal is large, the alkali or the like generated by hydrolysis of the alkali metal ion affects the physical properties of the deodorant. For example, when the amount of alkali metal is large, when the light of various energies is irradiated, the weather resistance of the deodorant deteriorates as the irradiation amount increases. It is possible to improve and use this deodorant under heating.

Examples of the oil for operation or lubrication that is deodorized by the above deodorant include oils used for hydraulic elevators, oils used for cutting metal, etc. It is not limited to these oils, but can be widely applied to general oils. When adding a deodorant to these oils, it is desirable to store the deodorant in a container and place it in the oil. As a result, the deodorant can be placed at a position where the deodorizing action can be most effectively exhibited without precipitation or the like in the oil, for example, a place where the oil is flowing.

Specifically, as shown in FIG. 1, in a device in which the oil 12 in the storage tank 10 is sucked up by a pump 14 or the like and circulated in the septic tank 16, the deodorant 1 stored in the container 2 is It is conceivable that the septic tank 16 is arranged in the vicinity of the discharge port 16A. In addition, it may be placed in a place where there is an oil flow, such as immediately before the oil supply pump.If it is not necessary to consider precipitation etc., add a fine deodorant directly to the oil. Good. In addition, the container that stores the deodorant must have an oil passage hole. As a result, the oil to be deodorized flows into the container, contacts the deodorant, and is effectively deodorized. In this way, as a result of deodorizing the oil, it was confirmed that the malodor was surely reduced after several weeks in response to human beings.

Next, a second embodiment of the present invention will be described. In this embodiment, an oil for working or lubrication comprises zinc oxide, titanium dioxide, and an aggregate of water and tightly bound particles. A deodorant is added to deodorize oil for operation or lubrication.

This deodorant is produced by drying a precipitate which is a tightly bound particle produced by mixing a mixed aqueous solution of a water-soluble titanium compound and a water-soluble zinc compound with an alkaline aqueous solution. As the water-soluble titanium compound, titanium sulfate, titanium chloride, titanium nitrate or the like can be used, and as the water-soluble zinc compound, zinc sulfate, zinc chloride, zinc nitrate, zinc acetate or the like can be used. As the alkaline aqueous solution used for neutralization, sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide or the like can be used. As described above, the deodorant used in this second embodiment can safely deodorize oil because it is composed of non-toxic zinc oxide, titanium dioxide and water.

When the deodorant is produced in this manner, the mixing ratio of the water-soluble titanium compound and the water-soluble zinc compound is 1: 9 to 9: 1, preferably, the molar ratio of titanium dioxide to zinc oxide, It is preferable to set it to 3 to 7 to 7 to 3. This is because if both are mixed in a ratio that deviates from this range, it is not possible to obtain a deodorant exhibiting sufficient adsorption characteristics, which is the same as the adsorption characteristics when only one of zinc oxide or titanic acid is used.

Further, the mixed solution of the water-soluble titanium compound and the water-soluble zinc compound and the combined solution after mixing with the alkaline aqueous solution are mixed so that the combined solution has a pH of 6 to 11, preferably 7 to 9. is important. This is because if the pH of the coalesced liquid is lower than 6 or higher than 11, the solubility of zinc hydroxide in the aqueous solution becomes large and the yield of zinc in the resulting precipitate becomes poor.

Further, when the mixed solution of the water-soluble titanium compound and the water-soluble zinc compound and the alkaline aqueous solution are mixed, it is important to mix them at the same time. If not at the same time, to the mixed solution of the water-soluble titanium compound and the water-soluble zinc compound, an alkaline aqueous solution is added, or conversely, if the mixed solution of the water-soluble titanium compound and the water-soluble zinc compound is added to the alkaline aqueous solution, titanic acid and Since the precipitation generation region of zinc hydroxide is different, titanic acid and zinc hydroxide form nearly pure titanic acid particles and zinc oxide particles, respectively, and precipitates as a mere mixture, resulting in sufficient adsorption characteristics. I can't show it.

The above mixing is preferably carried out at a temperature of 20 ° C to 80 ° C, preferably 40 ° C to 50 ° C.
In addition, the precipitate produced by mixing is filtered and washed, and then 1
It is preferable to dry at a temperature of 00 ° C to 220 ° C, preferably 150 ° C to 220 ° C.

The deodorant produced in this manner is particularly excellent in adsorption characteristics and is effective for malodors caused by malodorous gases such as hydrogen sulfide, mercaptans, amines and aldevides. Also, the oil to be deodorized by adding this deodorant,
The arrangement in the oil is almost the same as in the first embodiment. Since this deodorant has a good adsorption property up to around 400 ° C, it can be used even in a high temperature state.

Further, a third embodiment of the present invention will be described. In this embodiment, oil for operation or lubrication contains zinc oxide and one or both of aluminum oxide and silicon oxide. A deodorant consisting of an assembly of tightly bound particles is added to deodorize the oil.

As this deodorant, a water-soluble zinc compound and one or both of a water-soluble aluminum compound and a water-soluble silicon compound are used, and respective aqueous solutions are combined by adding an appropriate amount of an acid or alkaline aqueous solution. It is produced by drying the resulting tightly bound particle precipitate. As the water-soluble zinc compound, zinc sulfate, zinc chloride, zinc nitrate or the like can be used.
Further, as the water-soluble aluminum compound, aluminum sulfate or the like can be used, and as the water-soluble silicon compound, sodium silicon, silicon potassium, or the like can be used. Further, it is desirable to use an aqueous solution of sulfuric acid, hydrochloric acid or the like as the acidic aqueous solution and an aqueous solution of a metal hydroxide such as sodium hydroxide or potassium hydroxide as the alkaline aqueous solution. As described above, the deodorant used in the second embodiment is made of nontoxic zinc oxide, aluminum oxide, and silicon oxide, so that the oil can be safely deodorized.

When the deodorant is produced in this manner, the mixing ratio of the water-soluble zinc compound and one or both of the water-soluble aluminum compound and the water-soluble silicon compound is such that zinc oxide and aluminum oxide and silicon oxide are mixed. The molar ratio of either one or both is preferably 5:95 to 95: 5. This is because if the mixing ratio exceeds the above range, the deodorizing agent exhibiting sufficient adsorbing property cannot be obtained, which is the same as the adsorbing property when zinc oxide, aluminum oxide and silicon oxide are used alone.

The water-soluble zinc compound and one or both of the water-soluble aluminum compound and the water-soluble silicon compound may be mixed so that the pH of the combined liquid is in the range of 7 to 12. is important. The pH range for causing precipitation from an aqueous solution of a water-soluble salt of zinc oxide is 7
14 to 14 for aluminum oxide, and 0 to 12 for silicon oxide, it is possible to prevent particles having only one of the components from precipitating and failing to obtain sufficient adsorption characteristics. It is necessary to set a common pH of 7 to 12.

The above mixing is preferably carried out at a temperature of 20 ° C to 80 ° C, preferably 40 ° C to 60 ° C.
In addition, the precipitate produced by mixing is filtered and washed, and then 1
It is preferable to dry at a temperature of 00 ° C to 300 ° C, preferably 120 ° C to 250 ° C.

The deodorant produced in this manner is particularly excellent in adsorption characteristics and is effective for malodor caused by malodorous gases such as hydrogen sulfide, mercaptan, amine, and aldevid. Also, the oil to be deodorized by adding this deodorant,
The arrangement in the oil is almost the same as in the first embodiment. In addition, the deodorant in the third embodiment is also 400
Since it has a good adsorption property up to around ℃, it can be used even in a high temperature state.

Finally, a fourth embodiment of the present invention will be described. In this embodiment, 50 to 98% by weight of anion exchange resin and 50 to 2% by weight of cation are added to oil for working or lubricating. The oil is deodorized by adding a deodorant consisting of a mixture with the exchange resin.

As the anion exchange resin, a commonly known one can be used, which generally has an RN (CH ₃ ) group and is usually marketed in the form of chloride. In order to mix it with the resin, it is made into -OH type by using an aqueous solution of caustic soda. On the other hand, a cation exchange resin has an R—SO ₃ H group and is usually marketed in the form of a sodium salt.
Use a model. The deodorant used in this example is manufactured by mixing these two. in this way,
Since the third embodiment uses an anion exchange resin, it is particularly effective for deodorization by removing hydrogen sulfide. Further, since these anion exchange resin and cation exchange resin have low toxicity, oil can be safely deodorized.

As described above, the cation exchange resin is mixed with the anion exchange resin because the anion exchange resin removes hydrogen sulfide and may release a small amount of malodorous gas as an amine. This is because the odor is absorbed to remove the bad smell. Therefore, in the present example in which both are mixed, the anion exchange resin removes hydrogen sulfide, and the cation exchange resin removes the amine released by the anion exchange resin to effectively deodorize the oil.

In this case, if the amount of the cation exchange resin is less than 2% by weight, the amine cannot be removed sufficiently.
Further, since the amount of amine released from the anion exchange resin is very small, it is sufficient if the amount is 2% by weight or more, while it is useless to mix the amine in excess of 50% by weight. Due to the decrease, hydrogen sulfide may not be sufficiently removed. Therefore, the anion exchange resin and the cation exchange resin are 50 to 98% by weight of the former,
It is necessary to mix the latter in a proportion of 50 to 2% by weight, which allows the oil to be sufficiently deodorized.

The oil to be deodorized by adding this deodorant and the arrangement in the oil are almost the same as in the first embodiment.

[0046]

According to the present invention, as described above, an oil is prepared by using a deodorant obtained by coating an aluminosilicate containing a bactericidal metal ion as a supporting substrate of silica gel having a large number of pores and having a large surface area. Since the sterilizing metal ions are rapidly deodorized, the bactericidal metal ions diffuse quickly in the pores, and the contact area between the bactericidal metal ions and the bacteria increases, so that the oil can be effectively deodorized by sterilization. Since this deodorant is an inorganic type, it has the practical benefit of being able to safely deodorize oil, and since this silica gel and aluminosilicate containing metal ions are chemically bound, Even if it is placed in a place, it is not pulverized and deteriorates, and the deodorizing effect due to its sterilization can be maintained for a long period of time.

Further, according to the present invention, as described above, the deodorizing agent consisting of zinc oxide and the aggregate of the titanium dioxide and the particles of the tightly bound body of water is added to deodorize the oil, which is effective. It can absorb the malodorous gas of oil to deodorize,
In addition, since this deodorant is composed of zinc oxide, titanium dioxide and water, which have low toxicity, there is a practical advantage that oil can be safely deodorized.

Further, according to the present invention, as described above, an oil containing a deodorant consisting of an aggregate of particles of tightly bound zinc oxide and one or both of aluminum oxide and silicon oxide is added to the oil. Since it is deodorizing, it is possible to effectively adsorb the malodorous gas of the oil to achieve deodorization. Also, since this deodorant consists of zinc oxide, aluminum oxide and silicon oxide, which have low toxicity, There is a real benefit of being able to safely deodorize.

Finally, according to the present invention, as described above,
50-98 wt% anion exchange resin and 50-2 wt%
Deodorizing the oil by adding a deodorant consisting of a mixture of cation exchange resins, the anion exchange resin removes the malodorous gas, and at the same time, another malodorous gas that this anion exchange resin may release Since the exchange resin is adsorbed, it is possible to effectively remove the offensive odor gas of the oil for deodorization, and because this deodorant is composed of anion exchange resin and cation exchange resin with low toxicity, the oil is safe. There is a real benefit to being able to deodorize.

[Brief description of drawings]

FIG. 1 is a schematic view showing a state in which a deodorant used in the present invention is stored in a container and placed in oil.

[Explanation of symbols]

 1 Deodorant 2 Container 10 Storage Tank 12 Oil 14 Pump 16 Septic Tank 16A Discharge Port

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // (C10M 125/00 125: 14 125: 10) C10N 10:04 10:06 10:08 20 : 06 Z 30:00 G 40:08

Claims (8)

[Claims] 1. A deodorant composed of silica gel having a film of aluminosilicate containing a bactericidal metal ion on the surface of pores is added to an oil for working or lubrication to deodorize the oil. How to deodorize oil. 2. The method for deodorizing oil according to claim 1, wherein the deodorant is housed in a container having oil passage holes and arranged in the oil. 3. A deodorizing oil, which is characterized in that a deodorizing agent consisting of an aggregate of particles of tightly bound particles of zinc oxide, titanium dioxide and water is added to an oil for working or lubrication to deodorize the oil. Method. 4. The method for deodorizing oil according to claim 3, wherein the deodorant is housed in a container having oil passage holes and arranged in the oil. 5. An oil for operation or lubrication containing zinc oxide,
A method for deodorizing oil, which comprises deodorizing the oil by adding a deodorant consisting of an aggregate of particles of a tightly bound body with one or both of aluminum oxide and silicon oxide. 6. The method for deodorizing oil according to claim 5, wherein the deodorant is housed in a container having an oil passage and arranged in the oil. 7. A deodorizing agent comprising a mixture of 50 to 98% by weight of anion exchange resin and 50 to 2% by weight of cation exchange resin is added to an oil for working or lubrication to deodorize the oil. A method for deodorizing oil, which is characterized in that 8. The method of deodorizing oil according to claim 7, wherein the deodorant is housed in a container having an oil passage and arranged in the oil.