CN112725079A - Decoloring process for producing kitchen waste grease-based natural ester insulating oil - Google Patents
Decoloring process for producing kitchen waste grease-based natural ester insulating oil Download PDFInfo
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- CN112725079A CN112725079A CN202011255878.1A CN202011255878A CN112725079A CN 112725079 A CN112725079 A CN 112725079A CN 202011255878 A CN202011255878 A CN 202011255878A CN 112725079 A CN112725079 A CN 112725079A
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- kitchen waste
- waste grease
- oil
- grease
- natural ester
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Classifications
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/001—Refining fats or fatty oils by a combination of two or more of the means hereafter
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/008—Refining fats or fatty oils by filtration, e.g. including ultra filtration, dialysis
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/02—Refining fats or fatty oils by chemical reaction
- C11B3/08—Refining fats or fatty oils by chemical reaction with oxidising agents
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B3/00—Refining fats or fatty oils
- C11B3/10—Refining fats or fatty oils by adsorption
Abstract
The invention provides a decoloring process for producing kitchen waste grease-based natural ester insulating oil, which comprises the following steps: (1) heating the kitchen waste oil, adding a decolorizing agent, and carrying out solid-liquid separation while the kitchen waste oil is hot after decolorization to obtain preliminarily treated kitchen waste oil; (2) and (2) adding an oxidant into the preliminarily treated kitchen waste grease in the step (1), standing and layering after reaction, and removing a lower layer solution to obtain the decolorized kitchen waste grease. The process can not only remove the common pigments in the kitchen waste grease preliminarily, but also remove colloids, trace metals and some odor substances in the kitchen waste grease, and also can completely remove the stubborn pigments in the kitchen waste grease, so that the kitchen waste grease-based natural ester insulating oil reaches the color number required by the standard.
Description
Technical Field
The invention belongs to the field of treatment of kitchen waste grease, relates to a kitchen waste grease decoloring process, and particularly relates to a decoloring process for producing kitchen waste grease-based natural ester insulating oil.
Background
The natural ester insulating oil takes natural oil as a raw material, the main component of the natural ester insulating oil is fatty acid triglyceride, and the structural formula is as follows:
compared with the traditional mineral insulating oil, the natural ester insulating oil has the advantages of high safety, environmental friendliness, no toxicity, renewability, low carbon emission and the like, so that more and more attention is paid to people and the natural ester insulating oil is widely applied to western mainstream countries. The research of the natural ester insulating oil carried out abroad is earlier, a related technology and a standard system are formed, and the natural ester insulating oil is successfully applied to power transformers with high voltage grades of 220kV and above and is more widely applied to the field of distribution transformers. At present, the global application amount of the foreign natural ester insulating oil in the transformer reaches more than 120 thousands. In the last decade, research works related to the natural ester insulating oil are successively carried out by various colleges, research institutes and enterprises in China and the industrial standard of the natural ester insulating oil is established. Natural ester insulating oils have also been widely used in 10kV, 35kV distribution transformers and perform well.
The kitchen waste oil refers to various inferior oils in life, such as recovered edible oil, repeatedly used frying oil and the like, and the largest source of the kitchen waste oil is an oil separation tank of a sewer of a large-scale urban restaurant. The kitchen waste grease is obtained by subjecting animal oil and vegetable oil to high temperature and other conditions, so that the main component of the kitchen waste grease is also fatty acid triglyceride. At present, the domestic and foreign resource utilization of the kitchen waste oil is mainly used as raw materials for producing industrial products such as biodiesel, soap, aviation fuel, paint and the like, but the products have the defects that enterprises with low profits are difficult to follow or the industrial prospect with high cost is great, so that most of the kitchen waste oil is unknown, and great food safety risk exists. Therefore, the kitchen waste grease is used as a raw material for producing the natural ester insulating oil, so that the kitchen waste grease is turned into wealth, the resource utilization of the kitchen waste grease is correctly guided, and the food safety of people is guaranteed.
The decoloring method is classified into a physical method and a chemical method. The physical method mainly comprises adsorption, extraction, ion exchange and the like, and the chemical method mainly comprises oxidation, reduction, hydrogenation and the like. At present, the adsorption decoloring method is most widely applied to the preparation process of the natural ester insulating oil. Although the main components of the kitchen waste oil and the vegetable oil are fatty acid triglyceride, the main pigments in the kitchen waste oil are capsanthin, capsorubin and the like, and the pigments in the vegetable oil are mainly chlorophyll, carotenoid and the like, and the two have great difference in structure. And the kitchen waste grease has wide sources, and pigments in the kitchen waste grease are more difficult to remove due to repeated high-temperature cooking. Therefore, the adsorption decoloring process for producing the natural ester insulating oil from the vegetable oil hardly enables the kitchen waste grease to reach the color standard of the oil for the natural ester insulating oil.
CN 103571621A discloses a method for preparing biodiesel decoloration by using kitchen waste grease, which comprises the following steps: 1. the biodiesel is prepared by performing ester exchange on kitchen waste grease. 2. And (3) decoloring: putting 100g of biodiesel into a 250mL beaker, adding hydrogen peroxide with the mass fraction of 5-25% of the weight of oil, heating to 70-90 ℃, stirring, reacting for 18-25min, and centrifuging to obtain an upper phase. 3. And (3) calculating the decolorization ratio: and respectively adding the obtained grease into a cuvette with the length of 1.0cm, and scanning an absorption spectrum at 465 nm. The decolorization ratio is defined as the ratio of the difference between the absorbance before and after decolorization of the biodiesel to the absorbance before decolorization. According to the method, only hydrogen peroxide is used for decoloring, and the biodiesel is only decolored after the biodiesel is prepared from the kitchen waste oil, so that the decoloring effect is general, and the quality of the biodiesel is improved slightly.
CN 106520381A discloses a method for decolorizing and deodorizing fatty acid of waste kitchen grease. The process of the invention comprises the following steps: (1) heating and melting refined kitchen waste grease obtained by impurity removal and dehydration at 70-80 ℃; (2) sequentially adding excessive clear water, a proper amount of hydrolysis aid and concentrated sulfuric acid into the molten kitchen waste oil to perform hydrolysis reaction at the temperature of 90-170 ℃, standing, and discharging lower-layer liquid, wherein the upper-layer liquid is kitchen waste oil fatty acid; (3) adding a proper amount of strong oxidant into the obtained kitchen waste grease fatty acid at the temperature of 40-80 ℃, starting a negative pressure air draft device, controlling the pressure at 0.04-0.07 MPa, and reacting for 15-30 minutes; (4) adding a proper amount of adsorbent, controlling the temperature at 90-110 ℃, starting a negative pressure air draft device, controlling the pressure at 0.04-0.07 MPa, and reacting for 15-30 minutes; (5) and (3) filtering the mixed material of the kitchen waste oil fatty acid and the adsorbent under negative pressure to obtain the solid fatty acid which is odorless and is light yellow to white. The method needs hydrolysis, oxidation decoloration and adsorbent decoloration, and the oxidation decoloration process is before the adsorbent decoloration, so that the decoloration effect is poor.
Disclosure of Invention
In order to solve the technical problem existing in the prior art, the application provides a kitchen waste oil decoloring process for producing natural ester insulating oil, the process can preliminarily remove common pigments in the kitchen waste oil, can also remove colloid, trace metals and certain odor substances, and can also thoroughly remove stubborn pigments in the kitchen waste oil, so that the kitchen waste oil-based natural ester insulating oil reaches the standard required color number.
In order to achieve the technical effect, the invention adopts the following technical scheme:
the invention provides a kitchen waste grease decoloring process for producing natural ester insulating oil, which comprises the following steps:
(1) heating the kitchen waste oil, adding a decolorizing agent, and carrying out solid-liquid separation while the kitchen waste oil is hot after decolorization to obtain preliminarily treated kitchen waste oil;
(2) and (2) adding an oxidant into the preliminarily treated kitchen waste grease in the step (1), standing and layering after reaction, and removing a lower layer solution to obtain the decolorized kitchen waste grease.
According to the invention, firstly, common pigments in the kitchen waste oil are adsorbed and removed by using a decolorizing agent, colloid, trace metals and odor substances in the kitchen waste oil can be removed, then, oxidation and decolorization are carried out by using an oxidizing agent to remove stubborn pigments, and the two decolorizing modes have synergistic effect, so that an excellent decolorizing effect is achieved.
In a preferred embodiment of the present invention, the heating temperature in step (1) is 95 to 100 ℃, for example, 95.5 ℃, 96 ℃, 96.5 ℃, 97 ℃, 97.5 ℃, 98 ℃, 98.5 ℃, 99 ℃ or 99.5 ℃, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range of values are also applicable.
As a preferable technical scheme of the invention, the decolorizing agent in the step (1) is activated carbon and activated clay.
Preferably, the amount of the activated carbon added is 1.0-1.5% of the mass of the kitchen waste oil, such as 1.1%, 1.2%, 1.3% or 1.4%, but is not limited to the recited values, and other values not recited in the range of the recited values are also applicable.
Preferably, the amount of the activated clay added is 3.5-5.0% of the mass of the kitchen waste oil, such as 3.6%, 3.8%, 4.0%, 4.2%, 4.5% or 4.8%, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
According to the invention, the decolorizing agent adopts the combination of activated carbon and activated clay, the addition amount and the addition proportion of the two decolorizing agents are strictly controlled, and the synergistic effect of the two decolorizing agents improves the overall decolorizing capacity of the decolorizing agent in the waste kitchen oil.
As a preferred embodiment of the present invention, the decolorization in step (1) is carried out under stirring.
Preferably, the vacuum degree of the decolorization in the step (1) is 20 to 50mmHg, such as 25mmHg, 30mmHg, 35mmHg, 40mmHg, or 45mmHg, but is not limited to the recited values, and other values not recited in the range of the recited values are also applicable.
Preferably, the decolorization in step (1) is carried out for 2-3 hours, such as 2 hours, 2.2 hours, 2.5 hours, 2.8 hours, 2.9 hours, 3 hours, etc., but not limited to the recited values, and other values not recited in the range of the values are also applicable.
In a preferred embodiment of the present invention, the solid-liquid separation in step (1) is filtration.
In a preferred embodiment of the present invention, the oxidizing agent in step (2) comprises hydrogen peroxide.
In a preferred embodiment of the present invention, the mass fraction of the oxidizing agent in step (2) is 9 to 10%, for example, 9.1%, 9.2%, 9.3%, 9.4%, 9.5%, 9.6%, 9.7%, 9.8%, or 9.9%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned value range are also applicable, and the amount of the oxidizing agent added is 20% of the mass of the preliminarily treated waste kitchen fat.
In a preferred embodiment of the present invention, the temperature of the reaction in step (2) is 60 to 80 ℃, for example, 62 ℃, 65 ℃, 68 ℃, 70 ℃, 72 ℃, 75 ℃ or 78 ℃, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.
Preferably, the reaction time in step (2) is not less than 30-60 min, such as 30min, 35min, 40min, 45min, 50min, 55min or 60min, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable.
Preferably, in the step (2), the primarily treated kitchen waste grease is heated to a reaction temperature, and then the oxidant is added, wherein the temperature of the oxidant is the same as the reaction temperature.
And (3) refining the decolored kitchen waste oil after the step (2) to obtain the kitchen waste oil-based natural ester insulating oil.
As a preferable technical scheme of the invention, the kitchen waste grease decoloring process for producing the natural ester insulating oil comprises the following steps of:
(1) heating the kitchen waste oil to 95-100 ℃, adding activated carbon accounting for 1.0-1.5% of the mass of the kitchen waste oil and activated clay accounting for 3.5-5.0%, decoloring for not less than 2 hours under the vacuum degree of 20-50 mmHg, and filtering while hot to obtain preliminarily treated kitchen waste oil;
(2) heating the kitchen waste grease subjected to preliminary treatment in the step (1) to 60-80 ℃, adding hydrogen peroxide into the kitchen waste grease, wherein the mass fraction of the hydrogen peroxide is 9-10%, the adding amount of the hydrogen peroxide is 20% of the mass of the kitchen waste grease subjected to preliminary treatment, reacting for no less than 30min, standing and layering, and removing a lower-layer solution to obtain decolored kitchen waste grease;
(3) refining the decolored kitchen waste grease to obtain the kitchen waste grease-based natural ester insulating oil.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) the invention provides a kitchen waste grease decoloring process for producing natural ester insulating oil, which can preliminarily remove common pigments in the kitchen waste grease, remove colloids, trace metals and certain odor substances in the kitchen waste grease, and thoroughly remove stubborn pigments in the kitchen waste grease, so that the kitchen waste grease-based natural ester insulating oil reaches the color number required by the standard;
(2) the invention provides a kitchen waste grease decoloring process for producing natural ester insulating oil, which enables the color of the kitchen waste grease with complex components to meet the standard requirement of the natural ester insulating oil.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a kitchen waste grease decoloring process for producing natural ester insulating oil, which comprises the following steps:
(1) heating the kitchen waste oil to 95 ℃, adding activated carbon accounting for 1.0% of the mass of the kitchen waste oil and activated clay accounting for 3.5%, decoloring for 3 hours under the vacuum degree of 20-50 mmHg, and filtering while hot to obtain primarily treated kitchen waste oil;
(2) heating the kitchen waste grease subjected to primary treatment in the step (1) to 60 ℃, adding hydrogen peroxide into the kitchen waste grease, reacting for 45min, standing for layering, and removing a lower-layer solution to obtain decolorized kitchen waste grease, wherein the mass fraction of the hydrogen peroxide is 9% and the addition amount of the hydrogen peroxide is 20% of the mass of the kitchen waste grease subjected to primary treatment;
(3) refining the decolored kitchen waste grease to obtain the kitchen waste grease-based natural ester insulating oil.
Example 2
The embodiment provides a kitchen waste grease decoloring process for producing natural ester insulating oil, which comprises the following steps:
(1) heating the kitchen waste oil to 100 ℃, adding activated carbon accounting for 1.5% of the mass of the kitchen waste oil and activated clay accounting for 5.0%, decoloring for 2 hours under the vacuum degree of 20-50 mmHg, and filtering while hot to obtain primarily treated kitchen waste oil;
(2) heating the kitchen waste grease subjected to preliminary treatment in the step (1) to 80 ℃, adding hydrogen peroxide into the kitchen waste grease, reacting for 30min, standing and layering, and removing a lower layer solution to obtain decolorized kitchen waste grease, wherein the mass fraction of the hydrogen peroxide is 10% and the addition amount of the hydrogen peroxide is 20% of the mass of the kitchen waste grease subjected to preliminary treatment;
(3) refining the decolored kitchen waste grease to obtain the kitchen waste grease-based natural ester insulating oil.
Example 3
The embodiment provides a kitchen waste grease decoloring process for producing natural ester insulating oil, which comprises the following steps:
(1) heating the kitchen waste oil to 96 ℃, adding activated carbon accounting for 1.1% of the mass of the kitchen waste oil and activated clay accounting for 4.0%, decoloring for 2.5 hours under the vacuum degree of 20-50 mmHg, and filtering while hot to obtain primarily treated kitchen waste oil;
(2) heating the kitchen waste grease subjected to primary treatment in the step (1) to 65 ℃, adding hydrogen peroxide into the kitchen waste grease, reacting for 60min, standing and layering, and removing a lower-layer solution to obtain decolorized kitchen waste grease, wherein the mass fraction of the hydrogen peroxide is 9.2%, and the addition amount of the hydrogen peroxide is 20% of the mass of the kitchen waste grease subjected to primary treatment;
(3) refining the decolored kitchen waste grease to obtain the kitchen waste grease-based natural ester insulating oil.
Example 4
The embodiment provides a kitchen waste grease decoloring process for producing natural ester insulating oil, which comprises the following steps:
(1) heating the kitchen waste oil to 98 ℃, adding activated carbon accounting for 1.4% of the mass of the kitchen waste oil and activated clay accounting for 4.5%, decoloring for 3 hours under the vacuum degree of 20-50 mmHg, and filtering while hot to obtain primarily treated kitchen waste oil;
(2) heating the kitchen waste grease subjected to preliminary treatment in the step (1) to 75 ℃, adding hydrogen peroxide into the kitchen waste grease, reacting for 30min, standing and layering, and removing a lower layer solution to obtain decolorized kitchen waste grease, wherein the mass fraction of the hydrogen peroxide is 9.8%, and the addition amount of the hydrogen peroxide is 20% of the mass of the kitchen waste grease subjected to preliminary treatment;
(3) refining the decolored kitchen waste grease to obtain the kitchen waste grease-based natural ester insulating oil.
Example 5
The embodiment provides a kitchen waste grease decoloring process for producing natural ester insulating oil, which comprises the following steps:
(1) heating the kitchen waste oil to 97 ℃, adding activated carbon accounting for 1.2% of the mass of the kitchen waste oil and activated clay accounting for 3.5%, decoloring for 2 hours under the vacuum degree of 20-50 mmHg, and filtering while hot to obtain primarily treated kitchen waste oil;
(2) heating the kitchen waste grease subjected to preliminary treatment in the step (1) to 70 ℃, adding hydrogen peroxide into the kitchen waste grease, wherein the adding amount of the hydrogen peroxide is 9.5% of the mass of the kitchen waste grease subjected to preliminary treatment, reacting for 30min, standing and layering, and removing a lower-layer solution to obtain decolorized kitchen waste grease;
(3) refining the decolored kitchen waste grease to obtain the kitchen waste grease-based natural ester insulating oil.
Comparative example 1
The comparative example was carried out under the same conditions as in example 5 except that the oxidative decoloring in the step (2) was carried out first and then the adsorptive decoloring with the decoloring agent in the step (1) was carried out.
Comparative example 2
The comparative example is the same as the example 5 except that only activated carbon with the mass of 4.7% of the kitchen waste oil is added in the step (1) and activated clay is not added.
Comparative example 3
The comparative example is the same as the example 5 except that only activated clay with the mass of 4.7% of the waste kitchen oil is added in the step (1) and no activated carbon is added.
Comparative example 4
This comparative example was conducted under the same conditions as in example 5 except that the hydrogen peroxide in step (2) was replaced with an equal mass of activated alumina.
The results of the chromaticity measurement of the kitchen waste oil-based natural insulating oil prepared in examples 1 to 5 and comparative examples 1 to 4 are shown in table 1.
The method for testing the chromaticity is the method specified in the standard SH/T0168-1992, and the test method corresponds to the result No. 7 according to the requirements of ASTM D6871 on the chromaticity of the natural ester insulating oil.
TABLE 1
The applicant states that the present invention is illustrated by the above examples to show the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, i.e. it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A decoloring process for producing kitchen waste grease-based natural ester insulating oil is characterized by comprising the following steps:
(1) heating the kitchen waste oil, adding a decolorizing agent, and carrying out solid-liquid separation while the kitchen waste oil is hot after decolorization to obtain preliminarily treated kitchen waste oil;
(2) and (2) adding an oxidant into the preliminarily treated kitchen waste grease in the step (1), standing and layering after reaction, and removing a lower layer solution to obtain the decolorized kitchen waste grease.
2. The process of claim 1, wherein the heating temperature in step (1) is 95-100 ℃.
3. The process of claim 1 or 2, wherein the decolorizing agents of step (1) are activated carbon and activated clay;
preferably, the adding amount of the active carbon is 1.0-1.5% of the mass of the kitchen waste oil;
preferably, the adding amount of the activated clay is 3.5-5.0% of the mass of the waste kitchen grease.
4. The process according to any one of claims 1 to 3, wherein the decolorization in step (1) is carried out under stirring;
preferably, the vacuum degree of the decolorization in the step (1) is 20-50 mmHg;
preferably, the time for decoloring in the step (1) is 2-3 h.
5. The process according to any one of claims 1 to 4, wherein the solid-liquid separation method in step (1) is filtration.
6. The process of any one of claims 1 to 5, wherein the oxidizing agent of step (2) comprises hydrogen peroxide.
7. The process according to any one of claims 1 to 6, wherein the mass fraction of the oxidant in the step (2) is 9-10%, and the addition amount is 20% of the mass of the preliminarily treated kitchen waste grease.
8. The process according to any one of claims 1 to 7, wherein the temperature of the reaction in the step (2) is 60 to 80 ℃;
preferably, the reaction time in the step (2) is 30-60 min;
preferably, in the step (2), the primarily treated kitchen waste grease is heated to a reaction temperature, and then the oxidant is added, wherein the temperature of the oxidant is the same as the reaction temperature.
9. The process according to any one of claims 1 to 8, wherein step (3) is carried out after step (2) to refine the decolored kitchen waste oil to obtain the kitchen waste oil-based natural ester insulating oil.
10. Process according to any one of claims 1 to 9, characterized in that it comprises the following steps:
(1) heating the kitchen waste oil to 95-100 ℃, adding activated carbon accounting for 1.0-1.5% of the mass of the kitchen waste oil and activated clay accounting for 3.5-5.0%, decoloring for not less than 2 hours under the vacuum degree of 20-50 mmHg, and filtering while hot to obtain preliminarily treated kitchen waste oil;
(2) heating the kitchen waste grease subjected to preliminary treatment in the step (1) to 60-80 ℃, adding hydrogen peroxide into the kitchen waste grease, wherein the mass fraction of the hydrogen peroxide is 9-10%, the adding amount of the hydrogen peroxide is 20% of the mass of the kitchen waste grease subjected to preliminary treatment, reacting for no less than 30min, standing and layering, and removing a lower-layer solution to obtain decolored kitchen waste grease;
(3) refining the decolored kitchen waste grease to obtain the kitchen waste grease-based natural ester insulating oil.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114921290A (en) * | 2022-04-06 | 2022-08-19 | 浙江加宝新能源科技有限公司 | Production process of environment-friendly plant combustion oil |
| CN115197779A (en) * | 2022-06-23 | 2022-10-18 | 武汉泽电新材料有限公司 | Composite decoloring method for preparing electric insulating oil from deep-color kitchen waste grease |
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