CN111378468A - Regeneration method of waste transformer oil and regenerated transformer oil - Google Patents

Regeneration method of waste transformer oil and regenerated transformer oil Download PDF

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Publication number
CN111378468A
CN111378468A CN202010203239.4A CN202010203239A CN111378468A CN 111378468 A CN111378468 A CN 111378468A CN 202010203239 A CN202010203239 A CN 202010203239A CN 111378468 A CN111378468 A CN 111378468A
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transformer oil
hydrogen peroxide
waste
adsorbent
metal oxide
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CN111378468B (en
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肖静
伍博文
夏启斌
董磊
廖能
李忠
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South China University of Technology SCUT
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G27/00—Refining of hydrocarbon oils in the absence of hydrogen, by oxidation
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G25/00—Refining of hydrocarbon oils in the absence of hydrogen, with solid sorbents
    • C10G25/003—Specific sorbent material, not covered by C10G25/02 or C10G25/03
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G25/00—Refining of hydrocarbon oils in the absence of hydrogen, with solid sorbents
    • C10G25/006—Refining of hydrocarbon oils in the absence of hydrogen, with solid sorbents of waste oils, e.g. PCB's containing oils
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
    • C10G2300/20—Characteristics of the feedstock or the products
    • C10G2300/201—Impurities
    • C10G2300/202—Heteroatoms content, i.e. S, N, O, P

Abstract

The invention provides a method for regenerating waste transformer oil. The regeneration method of the waste transformer oil comprises the steps of adding an adsorbent and a hydrogen peroxide solution into the waste transformer oil, wherein the sulfur content in the waste transformer oil is 10-150ppm, the molar ratio of the hydrogen peroxide solution to the sulfur in the waste transformer oil is (1-1.1) to 1, the concentration of the hydrogen peroxide in the hydrogen peroxide solution is 10-20%, and the mass ratio of the adsorbent to the waste transformer oil is 5-7: 100; heating the reaction substance and stirring for reaction, wherein the reaction temperature is 30-50 ℃, and the stirring time is 1-1.5 hours; and removing water in the reaction system by using a molecular sieve to obtain the regenerated transformer oil. The method of the invention can ensure that the hydrogen peroxide remained in the regenerated transformer oil is as little as possible while using less hydrogen peroxide, and the method can also effectively oxidize and adsorb thioether of the transformer oil without influencing the service performance of the regenerated transformer oil.

Description

Regeneration method of waste transformer oil and regenerated transformer oil
Technical Field
The invention relates to the field of waste oil regeneration, in particular to a regeneration method of waste transformer oil and regenerated transformer oil.
Background
The transformer is used as core equipment in a power system, main works such as reasonably following and distributing electric energy, converting voltage, transmitting and the like are carried on the shoulder of a power grid system, transformer oil is usually added into the transformer during the working of the transformer, but corrosive sulfide, particularly thioether, in the transformer oil reacts with a copper wire during the working of the transformer, cuprous sulfide is generated on the surface of the wire and is separated out, the copper sulfide can often cause the reduction of the insulation resistance of the transformer, and the serious damage of the transformer equipment causes accidents. It is known that the formation of copper sulphide involves the oxidation of copper to form copper oxide, which is then reacted with sulphur species to form copper sulphide. For this reason, the new transformer oil standard IEC 60296 defines that the content of thioethers (DBDS) in the finished oil cannot be higher than 5 mg/kg. Therefore, the thioether in the failure transformer oil is efficiently removed and purified, so that the safe and stable operation of the transformer equipment is ensured, and the method has important economic and social benefits.
CN107699280A discloses a method for upgrading and regenerating waste oil, which comprises the steps of removing color, metal impurities and sulfides from the waste oil through catalytic oxidation-extraction processes at 0-40 ℃ after the waste oil is pretreated to obtain regenerated oil, wherein an oxidant is a gas oxidant or a liquid oxidant, and the liquid oxidant comprises liquid hydrogen peroxide. In this patent, the waste oil is oxidatively decolored, demetallized and desulfurized using an oxidizing agent. However, the patent does not disclose that much and little hydrogen peroxide is used for desulfurization, and the patent does not consider that the hydrogen peroxide can oxidize sulfur substances, but because the hydrogen peroxide is introduced into the waste oil, the introduced hydrogen peroxide is separated by a separation method later, but the regenerated oil still contains a little hydrogen peroxide, and the hydrogen peroxide is a substance with strong oxidizing property, which can oxidize copper into copper oxide, so that the regenerated oil is used in a transformer, the generation of copper sulfide is accelerated, and the ideal regeneration effect is not achieved. Therefore, it is necessary to control the amount of the sulfur oxide compound used in the hydrogen peroxide solution. However, the patent document does not disclose the use of hydrogen peroxide and does not show that the amount of hydrogen peroxide affects the regeneration effect of the waste oil.
CN110523370A discloses a preparation method of an adsorbent for removing dibenzyl disulfide from transformer oil at normal temperature, and particularly discloses that the adsorbent comprises a porous carrier and silver nitrate loaded on the porous carrier, wherein the adsorbent utilizes Pearson Hardney and Achillea Wilsoniana, and the surface of the carrier is loaded with soft acid anions which have adsorption effect on DBDS. That is, this patent is directed to a soft base DBDS to solve the problem of adsorption and desorption of the soft base DBDS, and does not suggest oxidizing the soft base DBDS to obtain a hard base having a strong polarity.
Disclosure of Invention
In view of the above, the present invention provides a method for regenerating waste transformer oil, in which less hydrogen peroxide is used to oxidize thioethers in the waste transformer oil, so that the oxidized sulfur has a stronger polarity, and then the sulfur is removed by adsorption with an adsorbent. Therefore, the invention provides an optimized process method which can ensure that the hydrogen peroxide remained in the regenerated transformer oil is as little as possible while using less hydrogen peroxide, does not influence the service performance of the regenerated transformer oil, and can effectively oxidize and adsorb thioether of the transformer oil.
A method for regenerating waste transformer oil comprises the following steps:
the method comprises the following steps: adding an adsorbent and a hydrogen peroxide solution into waste transformer oil, wherein the sulfur content in the waste transformer oil is 10-150ppm, the molar ratio of the hydrogen peroxide solution to the sulfur in the waste transformer oil is (1-1.1) to 1, the concentration of the hydrogen peroxide in the hydrogen peroxide solution is 10-20%, and the mass ratio of the adsorbent to the waste transformer oil is 5-7: 100;
step two: heating the reaction substance in the step one, and stirring for reaction, wherein the reaction temperature is 30-50 ℃, and the stirring time is 1-1.5 hours;
step three: and removing water in the reaction system by using a molecular sieve to obtain the regenerated transformer oil.
Preferably, the sulfur content in the waste pressure swing gasoline is 100-150ppm, and the molar ratio of the hydrogen peroxide solution to the sulfur in the waste pressure swing gasoline is 1: 1.
Preferably, the reaction temperature is 35-40 ℃.
Preferably, the adsorbent comprises a carrier and a metal oxide supported on the carrier, and the mass ratio of the metal oxide to the carrier is 1-15%.
Preferably, the metal oxide is ZnO, the carrier is one of silica gel, alumina, a 13X molecular sieve or kaolin, and the ZnO accounts for 1-3% of the weight of the adsorbent.
Preferably, the metal oxide is TiO2、Ag2O, CuO and NiO, the carrier is one of silica gel, alumina, 13X molecular sieve or kaolin, and the metal oxide accounts for 5-15% of the weight of the adsorbent.
Preferably, the metal oxide is TiO2CuO and NiO, the TiO2The molar ratio of CuO to NiO is as follows: TiO 22CuO and NiO are 1: 1.5: 1.2, the carrier is alumina, and the metal oxide accounts for 6% of the weight of the adsorbent.
Preferably, the metal oxide is TiO2、Ag2O and CuO, the TiO2、Ag2The molar ratio of O to CuO is: TiO 22∶Ag2And the carrier is alumina, and the metal oxide accounts for 7 percent of the weight of the adsorbent.
Preferably, the metal oxide is TiO2、Ag2O, CuO and NiO, the TiO2、Ag2O, CuO and NiO in a molar ratio of: TiO 22∶Ag2O, CuO and NiO are 1: 1.15: 1.05:1.3, the carrier is silica gel, and the metal oxide accounts for 12% of the weight of the adsorbent.
In a second aspect of the present application, a regenerated transformer oil prepared by the method for regenerating a waste transformer oil according to any one of the above aspects.
The invention has the beneficial effects that: the optimization process method of the invention can ensure that the hydrogen peroxide remained in the regenerated transformer oil is as little as possible while using less hydrogen peroxide, and the use performance of the regenerated transformer oil is not influenced, and the thioether of the transformer oil can be effectively oxidized and adsorbed.
Detailed Description
While the following is a description of the preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Corrosive sulfide, particularly thioether, in the transformer oil reacts with a copper wire in the operation of a transformer, cuprous sulfide is generated on the surface of the copper wire and is separated out, and the copper sulfide can often cause the insulation resistance of the transformer to be reduced, and the transformer equipment is seriously damaged to cause accidents. The generation of copper sulfide comprises the steps of oxidizing copper to generate copper oxide, and then oxidizing the copper oxide and sulfur substances to generate copper sulfide, so that the copper can be prevented from being oxidized, the content of sulfur can be reduced, and the using effect of the waste transformer oil can be improved. Based on the method, the thioether substances of the waste transformer oil can be effectively removed, and the service performance of the regenerated transformer oil can be improved.
A method for regenerating waste transformer oil comprises the following steps:
the method comprises the following steps: adding an adsorbent and a hydrogen peroxide solution into waste transformer oil, wherein the sulfur content in the waste transformer oil is 10-150ppm, the molar ratio of the hydrogen peroxide solution to the sulfur in the waste transformer oil is (1-1.1) to 1, the concentration of the hydrogen peroxide in the hydrogen peroxide solution is 10-20%, and the mass ratio of the adsorbent to the waste transformer oil is 5-7 to 100. In the invention, the used hydrogen peroxide is very little and reaches the ppm level, and the hydrogen peroxide can oxidize the thioether in the waste transformer oil to generate sulfoxide, thereby enhancing the polarity of the sulfide; the adsorption sites on the adsorbent then adsorb the high-polarity sulfoxide with high selectivity, thereby greatly improving the capacity of adsorption desulfurization.
Step two: and (3) heating the reaction substance in the step one, and stirring for reaction, wherein the reaction temperature is 30-50 ℃, and the stirring time is 1-1.5 hours. Since the hydrogen peroxide is decomposed at a high temperature, the reaction temperature is set to be between 30 and 50 ℃ for the best utilization of the use efficiency of the hydrogen peroxide.
Step three: and removing water in the reaction system by using a molecular sieve to obtain the regenerated transformer oil.
The invention adopts the method of combining the oxidation and adsorption double functions for desulfurization, and can effectively provide the desulfurization efficiency and the service performance of the regenerated transformer gasoline; the invention can change the polarity of thioether by using a small amount of hydrogen peroxide to generate sulfoxide, and the regenerated non-transformer oil has better performance. Reference is made to the following specific examples.
Preferably, the sulfur content in the waste pressure swing gasoline is 100-150ppm, and the molar ratio of the hydrogen peroxide solution to the sulfur in the waste pressure swing gasoline is 1: 1. The effect of the usage amount of the hydrogen peroxide in the proportion is optimal.
Preferably, the reaction temperature is 35-40 ℃. The temperature setting makes the desulfurization regeneration effect better.
Preferably, the adsorbent comprises a carrier and a metal oxide supported on the carrier, and the mass ratio of the metal oxide to the carrier is 1-15%.
Preferably, the metal oxide is ZnO, the carrier is one of silica gel, alumina, a 13X molecular sieve or kaolin, and the ZnO accounts for 1-3% of the weight of the adsorbent.
Preferably, the metal oxide is TiO2、Ag2O, CuO and NiO, the carrier is one of silica gel, alumina, 13X molecular sieve or kaolin, and the metal oxide accounts for 5-15% of the weight of the adsorbent.
In patent CN110523370A, silver nitrate supported on a carrier is used for adsorbing the soft base DBDS, and the anion is soft acid. In the invention, ZnO, CuO and NiO are used as boundary acid, TiO2Is stearic acid.
Preferably, the metal oxide is TiO2CuO and NiO, the TiO2The molar ratio of CuO to NiO is as follows: TiO 22CuO and NiO are 1: 1.5: 1.2, the carrier is alumina, and the metal oxide accounts for 6% of the weight of the adsorbent. TiO to be used as a hard acid2And CuO and NiO which are used as boundary acid, and has better adsorption desulfurization effect under the condition of less adsorption dosage.
Preferably, the metal oxide is TiO2、Ag2O and CuO, the TiO2、Ag2The molar ratio of O to CuO is: TiO 22∶Ag2And the carrier is alumina, and the metal oxide accounts for 7 percent of the weight of the adsorbent. The proportioning effect is better.
Preferably, the metal oxide is TiO2、Ag2O, CuO and NiO, the TiO2The molar ratio of Ag2O to CuO to NiO is as follows: TiO 22∶Ag2O, CuO and NiO are 1: 1.15: 1.05:1.3, the carrier is silica gel, and the metal oxide accounts for 12% of the weight of the adsorbent. The proportioning effect is better.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
(1) Method for preparing adsorbent
Dissolving metal nitrate in water, uniformly mixing, slowly and dropwisely adding the mixed metal nitrate solution into a mechanical ball mill of a carrier material, uniformly dispersing, drying, and carrying out temperature programming to 400 ℃ for calcining for 2 hours to obtain the thioether-removed adsorbent. Wherein the cation in the metal nitrate is selected according to the invention as described above and the support material is selected according to the invention as described above.
(2) Regeneration method of waste transformer oil
The method comprises the following steps: adding an adsorbent and a hydrogen peroxide solution into waste transformer oil, wherein the sulfur content in the waste transformer oil is 10-150ppm, the molar ratio of the hydrogen peroxide solution to the sulfur in the waste transformer oil is (1-1.1) to 1, the concentration of the hydrogen peroxide in the hydrogen peroxide solution is 10%, and the mass ratio of the adsorbent to the waste transformer oil is 5-7: 100;
step two: heating the reaction substance in the step one, and stirring for reaction, wherein the reaction temperature is 30-50 ℃, and the stirring time is 1-1.5 hours;
step three: and removing water in the reaction system by using a molecular sieve to obtain the regenerated transformer oil.
(3) Application of regenerated transformer oil
The copper sheet is inserted into the regenerated transformation gasoline for use, and the corrosivity of the copper sheet is realized, so that the use effect of the regenerated transformation gasoline after being used in the transformer can be known.
According to the method for regenerating the waste transformer oil in the step (2), the regeneration effect of the regenerated transformer oil is observed by adjusting the consumption of hydrogen peroxide, the consumption of an adsorbent and the reaction temperature, the sulfur content of the regenerated transformer oil is respectively detected, the detection method is GB/T17040 plus 2019, the corrosivity of a copper sheet after the copper sheet is inserted into the regenerated transformer oil is detected, the detection method is GB/T5096, wherein the larger the number of the stages is, the larger the corrosion degree is, for example, the corrosion degree of the 4 stages is larger than that of the 1 stage, and the detection in the application detects the average value of three times. See in particular tables 1 to 3. The sulfur content in the used transformer oil used in tables 1 and 2 was 150 ppm. The mass ratio of the adsorbent to the waste pressure swing gasoline is 6: 100, wherein the adsorbent carrier in the table 1 is alumina. Table 3 shows the effect data of each example.
TABLE 1
Figure BDA0002420083940000061
TABLE 2
Figure BDA0002420083940000071
TABLE 3
Figure BDA0002420083940000072
Figure BDA0002420083940000081
As can be seen from tables 1 to 3, example 1 is the most effective, has the least sulfur content after regeneration, and has the lowest corrosion level for copper sheets. The embodiment 2 and the embodiment 3 have better effect within the protection range of the invention by adjusting the dosage of the hydrogen peroxide.
In the embodiments 4 and 5, the amount of hydrogen peroxide is increased, and although the content of the regenerated transformer oil is not changed greatly, the corrosion of the copper sheet is accelerated due to the increase of the amount of hydrogen peroxide, which causes the increase of the hydrogen peroxide remained in the regenerated transformer oil, so that the corrosion level is increased to 2; the larger amount of hydrogen peroxide in example 6 resulted in a level of 3 corrosion of the copper sheet. Therefore, the consumption of the hydrogen peroxide needs to be strictly controlled, so that the residual hydrogen peroxide can be effectively avoided and the corrosion to the copper sheet is accelerated.
Examples 8 to 11 show that the adsorption effect is better at the amount used in the present invention, and the effect of increasing the adsorbent is not much affected.
Examples 12 to 18 show that the reaction temperature effect of the present invention is good, and when the temperature is raised to above 60 ℃, hydrogen peroxide is decomposed, thereby affecting the desulfurization effect. The copper sheet also has an increased level of corrosion due to the increased sulfur content.
Example 19-comparison of example 23 with example 1-TiO can be seen2CuO and NiO are 1: 1.5: 1.2, preferably.
Comparison of example 24 to example 26 shows that example 24 is preferred.
Example 27 is preferred as seen by comparison of example 27 to example 29.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The method for regenerating the waste transformer oil is characterized by comprising the following steps of:
the method comprises the following steps: adding an adsorbent and a hydrogen peroxide solution into waste transformer oil, wherein the sulfur content in the waste transformer oil is 10-150ppm, the molar ratio of the hydrogen peroxide solution to the sulfur in the waste pressure swing gasoline is (1-1.1) to 1, the mass percentage concentration of the hydrogen peroxide in the hydrogen peroxide solution is 10-20%, and the mass ratio of the adsorbent to the waste pressure swing gasoline is 5-7: 100;
step two: heating the reaction substance in the step one, and stirring for reaction, wherein the reaction temperature is 30-50 ℃, and the stirring time is 1-1.5 hours;
step three: and removing water in the reaction system by using a molecular sieve to obtain the regenerated transformer oil.
2. The method for regenerating waste transformer oil as claimed in claim 1, wherein the sulfur content in the waste transformer gasoline is 100-150ppm, and the molar ratio of the hydrogen peroxide solution to the sulfur in the waste transformer gasoline is 1: 1.
3. The method for recycling waste transformer oil of claim 1, wherein in the second step, the reaction temperature is 35-40 ℃.
4. The method for regenerating waste transformer oil as claimed in claim 1, wherein the adsorbent comprises a carrier and a metal oxide supported on the carrier, and the mass ratio of the metal oxide to the carrier is 1 to 15%.
5. The method for regenerating the waste transformer oil as claimed in claim 4, wherein the metal oxide is ZnO, the carrier is one of silica gel, alumina, 13X molecular sieve or kaolin, and the ZnO accounts for 1-3% of the weight of the adsorbent.
6. The method for recycling waste transformer oil of claim 4, wherein the metal oxide is TiO2、Ag2O, CuO and NiO, the carrier is one of silica gel, alumina, 13X molecular sieve or kaolin, and the metal oxide accounts for 5-15% of the weight of the adsorbent.
7. The method for recycling waste transformer oil of claim 4, wherein the metal oxide is TiO2CuO and NiO, the TiO2The molar ratio of CuO to NiO is as follows: TiO 22CuO and NiO = 1: 1.5: 1.2, the carrier is alumina, and the metal oxide accounts for 6% of the weight of the adsorbent.
8. The method for recycling waste transformer oil of claim 4, wherein the metal oxide is TiO2、Ag2O and CuO, the TiO2、Ag2The molar ratio of O to CuO is: TiO 22∶Ag2O: CuO = 1: 1.1: 1.3, the carrier is alumina, and the metal oxide accounts for 7% of the weight of the adsorbent.
9. The method for recycling waste transformer oil of claim 6, wherein the metal oxide is TiO2、Ag2O, CuO and NiO, the TiO2、Ag2O, CuO and NiO in a molar ratio of: TiO 22∶Ag2O, CuO and NiO = 1: 1.15: 1.05:1.3, the carrier is silica gel, and the metal oxide accounts for 12% of the weight of the adsorbent.
10. A regenerated transformer oil produced by the method for regenerating a waste transformer oil according to any one of claims 1 to 9.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5961820A (en) * 1998-05-27 1999-10-05 Ds2 Tech, Inc. Desulfurization process utilizing an oxidizing agent, carbonyl compound, and hydroxide
CN101255352A (en) * 2008-04-21 2008-09-03 大连理工大学 Method for removing sulfides in gasoline by oxidation-absorption under mild conditions
CN104403775A (en) * 2014-10-15 2015-03-11 安徽蓝翔电器成套设备有限公司 Regenerative method of waste transformer oil and transformer oil
CN106566577A (en) * 2015-10-12 2017-04-19 中国石油化工股份有限公司 Method for removal of sulfide in oil product by molecular sieve catalytic oxidation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5961820A (en) * 1998-05-27 1999-10-05 Ds2 Tech, Inc. Desulfurization process utilizing an oxidizing agent, carbonyl compound, and hydroxide
CN101255352A (en) * 2008-04-21 2008-09-03 大连理工大学 Method for removing sulfides in gasoline by oxidation-absorption under mild conditions
CN104403775A (en) * 2014-10-15 2015-03-11 安徽蓝翔电器成套设备有限公司 Regenerative method of waste transformer oil and transformer oil
CN106566577A (en) * 2015-10-12 2017-04-19 中国石油化工股份有限公司 Method for removal of sulfide in oil product by molecular sieve catalytic oxidation

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