CN114032076A - Hydrogenated terphenyl heat conduction oil synthesis process - Google Patents
Hydrogenated terphenyl heat conduction oil synthesis process Download PDFInfo
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- CN114032076A CN114032076A CN202111610872.6A CN202111610872A CN114032076A CN 114032076 A CN114032076 A CN 114032076A CN 202111610872 A CN202111610872 A CN 202111610872A CN 114032076 A CN114032076 A CN 114032076A
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- YJTKZCDBKVTVBY-UHFFFAOYSA-N 1,3-Diphenylbenzene Chemical group C1=CC=CC=C1C1=CC=CC(C=2C=CC=CC=2)=C1 YJTKZCDBKVTVBY-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 25
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 23
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000002131 composite material Substances 0.000 claims abstract description 34
- 239000003054 catalyst Substances 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002808 molecular sieve Substances 0.000 claims abstract description 13
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004305 biphenyl Substances 0.000 claims abstract description 11
- 235000010290 biphenyl Nutrition 0.000 claims abstract description 9
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 9
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 9
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 6
- 239000004480 active ingredient Substances 0.000 claims abstract description 5
- 238000004821 distillation Methods 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 36
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 20
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000005303 weighing Methods 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- 229910052725 zinc Inorganic materials 0.000 claims description 12
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- 229910052749 magnesium Inorganic materials 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 229910002651 NO3 Inorganic materials 0.000 claims description 6
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 6
- 238000000975 co-precipitation Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 6
- 239000002244 precipitate Substances 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000012266 salt solution Substances 0.000 claims description 6
- 238000000498 ball milling Methods 0.000 claims description 4
- 239000012295 chemical reaction liquid Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 2
- 239000006227 byproduct Substances 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 description 6
- 238000004587 chromatography analysis Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000010412 oxide-supported catalyst Substances 0.000 description 4
- 239000011541 reaction mixture Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- OIAQMFOKAXHPNH-UHFFFAOYSA-N 1,2-diphenylbenzene Chemical group C1=CC=CC=C1C1=CC=CC=C1C1=CC=CC=C1 OIAQMFOKAXHPNH-UHFFFAOYSA-N 0.000 description 1
- XJKSTNDFUHDPQJ-UHFFFAOYSA-N 1,4-diphenylbenzene Chemical group C1=CC=CC=C1C1=CC=C(C=2C=CC=CC=2)C=C1 XJKSTNDFUHDPQJ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/10—Liquid materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a process for synthesizing hydrogenated terphenyl heat conduction oil, and belongs to the technical field of chemical synthesis. The process comprises biphenyl synthesis, distillation and hydrogenation processes, wherein pure benzene and a catalyst are used for high-temperature reaction in a reactor in the biphenyl synthesis process, the catalyst comprises a carrier and an active component, and the active component accounts for 10% -35% of the mass of the carrier; the carrier is modified active carbon or a molecular sieve, and the active ingredients are CuMgAl, CuFeAl, CuFeZn and CaMgZn composite oxides. In the synthesis stage of the terphenyl, the catalyst adopts a supported catalyst taking a composite metal oxide as an active component, so that the selectivity of the terphenyl is improved, the generation of by-products such as the tetrabiphenyl, the pentabiphenyl and the like is reduced, and finally the purity of the hydrogenated terphenyl heat conduction oil is improved.
Description
Technical Field
The invention belongs to the technical field of chemical synthesis, and particularly relates to a process for synthesizing hydrogenated terphenyl heat conduction oil.
Background
Hydrogenated terphenyl is heat conducting oil with excellent performance and is a mixture of partially hydrogenated terphenyl isomers obtained by partially hydrogenating a mixture of ortho-terphenyl, meta-terphenyl and para-terphenyl in different proportions. The hydrogenated terphenyl has the characteristics of excellent thermal stability, oxidation resistance, low vapor pressure and the like.
The production process of hydrogenated terphenyl comprises the steps of synthesizing terphenyl isomers, and then carrying out terphenyl hydrogenation to prepare a hydrogenated terphenyl product. In addition to the terphenyl isomer, by-products such as tetra-biphenyl, penta-biphenyl and the like can be generated in the biphenyl synthesis process. In the prior art, all products obtained in the biphenyl synthesis stage are generally directly subjected to a hydrogenation process, and are separated and purified through multiple times of distillation after hydrogenation, so that the hydrogen consumption is high, and the distillation and separation processes are complex. How to improve the selectivity of the generated terphenyl and reduce the generation of byproducts in the synthesis stage of the biphenyl so as to improve the purity of the hydrogenated terphenyl heat conduction oil is continuously researched and hoped to be broken through.
Disclosure of Invention
Aiming at the problems in the prior art, the technical problem to be solved by the invention is to provide a process for synthesizing hydrogenated terphenyl heat conduction oil, wherein a supported catalyst with composite metal oxide as an active component is adopted as the catalyst in the terphenyl synthesis stage, so that the selectivity of terphenyl is improved, the generation of by-products such as tetrabiphenyl, pentabiphenyl and the like is reduced, and the purity of the hydrogenated terphenyl heat conduction oil is finally improved.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the synthesis process of the hydrogenated terphenyl heat conduction oil comprises biphenyl synthesis, distillation and hydrogenation processes, wherein pure benzene and a catalyst are used for high-temperature reaction in a reactor in the biphenyl synthesis process, the catalyst comprises a carrier and an active component, and the active component accounts for 10% -35% of the mass of the carrier; the carrier is modified active carbon or a molecular sieve, and the active ingredients are CuMgAl, CuFeAl, CuFeZn and CaMgZn composite oxides.
According to the synthesis process of the hydrogenated terphenyl heat conduction oil, the molar ratio of Cu, Mg and Al in the CuMgAl composite oxide is 1:0.8-1.5:2, the molar ratio of Cu, Fe and Al in the CuFeAl composite oxide is 1:0.3-1.0:1.2-2.2, the molar ratio of Cu, Fe and Zn in the CuFeZn composite oxide is 1:0.1-0.5:0.6-1.2, and the molar ratio of Ca, Mg and Zn in the CaMgZn composite oxide is 1:2.3-3.8: 0.1-0.8.
The synthesis process of the hydrogenated terphenyl heat conduction oil comprises the following specific preparation processes of:
(1) weighing corresponding nitrate solution according to the molar ratio of different metals in the composite metal oxide to prepare metal salt solution with the mixed solution concentration of 0.10-0.50 mol/L;
(2) weighing sodium hydroxide or potassium hydroxide to prepare an alkali solution with the concentration of 0.8-1 mol/L;
(3) weighing carrier modified activated carbon or molecular sieve, placing the carrier modified activated carbon or molecular sieve in deionized water, controlling the temperature to be 85-90 ℃, simultaneously dripping the solutions in the step (1) and the step (2) by adopting a coprecipitation method, adding a phosphoric acid solution with the mass fraction of 10 +/-1%, and controlling the pH of the system to be 9-10; after the precipitation is completed, aging the reaction solution for 24-48h at 70-75 ℃;
(4) and (4) filtering the reaction liquid in the step (3), washing the precipitate with deionized water, drying at the temperature of 100-105 ℃, calcining for 1-5h at the temperature of 550-600 ℃ in a muffle furnace, and then grinding into particles with the particle size of less than 120 meshes to obtain the catalyst.
The synthesis process of the hydrogenated terphenyl heat conduction oil comprises the following steps of: adding 10 +/-1 mass percent of phosphoric acid solution into 60-80-mesh active carbon particles, and soaking for 4-6 h; then ball milling the mixed material to 100-.
According to the synthesis process of the hydrogenated terphenyl heat conduction oil, the molecular sieve carrier is ZSM-5 or ZSM-11.
In the hydrogenated terphenyl heat conduction oil synthesis process, the active component accounts for 20-28% of the mass of the carrier; the carrier is modified activated carbon, and the active component is a CuFeZn and CaMgZn composite oxide; the mol ratio of Cu, Fe and Zn in the CuFeZn composite oxide is 1:0.2-0.3:0.8-1.0, and the mol ratio of Ca, Mg and Zn in the CaMgZn composite oxide is 1:3.0-3.3: 0.5-0.8.
In the hydrogenated terphenyl heat conduction oil synthesis process, the active component accounts for 23 percent of the mass of the carrier; the carrier is modified activated carbon, and the active ingredient is CuFeZn composite oxide; the mol ratio of Cu, Fe and Zn in the CuFeZn composite oxide is 1:0.25: 0.9.
Has the advantages that:
compared with the prior art, the supported catalyst with the composite metal oxide as the active component is adopted in the catalyst in the synthesis stage of the terphenyl, so that the selectivity of the terphenyl is improved, the generation of by-products such as the tetrabiphenyl, the pentabiphenyl and the like is reduced, and the purity of the hydrogenated terphenyl heat conduction oil is finally improved.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.
Example 1
The preparation method of the CuMgAl composite oxide supported catalyst comprises the following steps:
(1) weighing corresponding nitrate solution according to the molar ratio of Cu, Mg and Al in the composite metal oxide of 1:1:2 to prepare metal salt solution with the mixed solution concentration of 0.10 mol/L;
(2) weighing sodium hydroxide or potassium hydroxide to prepare an alkali solution with the concentration of 0.80 mol/L;
(3) weighing a carrier molecular sieve ZSM-11, placing the carrier molecular sieve ZSM-11 in deionized water, controlling the temperature at 85 ℃, simultaneously dripping the solutions in the step (1) and the step (2) by adopting a coprecipitation method, adding a phosphoric acid solution with the mass fraction of 10%, and controlling the pH value of the system to be 9; after the precipitation is completed, aging the reaction solution at 70 ℃ for 48 h;
(4) and (3) filtering the reaction solution in the step (3), washing the precipitate with deionized water, drying at 100 ℃, calcining at 550 ℃ in a muffle furnace for 4 hours, and then grinding into particles of 120 meshes to obtain the catalyst.
Mixing pure benzene and the catalyst in a reactor, wherein the dosage of the catalyst is 10% of the mass of the pure benzene, and then adding the mixture into an evaporator for evaporation; adding benzene steam into a tubular reactor for reaction; after the reaction was completed, the reaction mixture was cooled.
The sample was analyzed by chromatography, and the terphenyl content was 83.45%.
Example 2
The preparation method of the CuFeAl composite oxide supported catalyst comprises the following steps:
(1) weighing corresponding nitrate solution according to the molar ratio of Cu, Fe and Al in the composite metal oxide of 1:0.6:1.8 to prepare metal salt solution with the concentration of mixed solution of 0.10 mol/L;
(2) weighing sodium hydroxide or potassium hydroxide to prepare an alkali solution with the concentration of 0.80 mol/L;
(3) weighing a carrier molecular sieve ZSM-5, placing the carrier molecular sieve ZSM-5 in deionized water, controlling the temperature at 85 ℃, adopting a coprecipitation method, simultaneously dropwise adding the solutions in the step (1) and the step (2), adding a phosphoric acid solution with the mass fraction of 10%, and controlling the pH value of the system to be 9; after the precipitation is completed, aging the reaction solution at 70 ℃ for 48 h;
(4) and (3) filtering the reaction solution in the step (3), washing the precipitate with deionized water, drying at 100 ℃, calcining at 550 ℃ in a muffle furnace for 4 hours, and then grinding into particles of 120 meshes to obtain the catalyst.
Mixing pure benzene and the catalyst in a reactor, wherein the dosage of the catalyst is 15% of the mass of the pure benzene, and then adding the mixture into an evaporator for evaporation; adding benzene steam into a tubular reactor for reaction; after the reaction was completed, the reaction mixture was cooled.
The sample was analyzed by chromatography, and the terphenyl content was 90.22%.
Example 3
The preparation method of the CuFeZn composite oxide supported catalyst comprises the following steps:
(1) weighing corresponding nitrate solution according to the molar ratio of Cu, Fe and Zn in the composite metal oxide of 1:0.25:0.9, and preparing metal salt solution with the concentration of mixed solution of 0.10 mol/L;
(2) weighing sodium hydroxide or potassium hydroxide to prepare an alkali solution with the concentration of 0.80 mol/L;
(3) adding 10% phosphoric acid solution into 60-80 mesh active carbon particles, and soaking for 4 h; then ball-milling the mixed material to 100-120 meshes, filtering, washing the solid material with deionized water to neutrality, and drying at 120 ℃ to constant weight to obtain a modified activated carbon carrier;
(4) the active component accounts for 23 percent of the mass of the carrier, and the modified active carbon is weighed; putting a carrier in deionized water, controlling the temperature at 85 ℃, simultaneously dripping the solutions in the step (1) and the step (2) by adopting a coprecipitation method, adding a phosphoric acid solution with the mass fraction of 10%, and controlling the pH value of the system to be 9; after the precipitation is completed, aging the reaction solution at 70 ℃ for 48 h;
(5) and (3) filtering the reaction liquid in the step (4), washing the precipitate by deionized water, drying at 100 ℃, calcining at 550 ℃ in a muffle furnace for 4 hours, and then grinding into particles of 120 meshes to obtain the catalyst.
Mixing pure benzene and the catalyst in a reactor, wherein the dosage of the catalyst is 10% of the mass of the pure benzene, and then adding the mixture into an evaporator for evaporation; adding benzene steam into a tubular reactor for reaction; after the reaction was completed, the reaction mixture was cooled.
The content of terphenyl was 96.31% by sampling and chromatography.
Example 4
The preparation method of the CaMgZn composite oxide supported catalyst comprises the following steps:
(1) weighing corresponding nitrate solution according to the molar ratio of Cu, Mg and Zn in the composite metal oxide of 1:3.0:0.6 to prepare metal salt solution with the concentration of mixed solution of 0.10 mol/L;
(2) weighing sodium hydroxide or potassium hydroxide to prepare an alkali solution with the concentration of 0.80 mol/L;
(3) adding 10% phosphoric acid solution into 60-80 mesh active carbon particles, and soaking for 6 h; then ball-milling the mixed material to 100-120 meshes, filtering, washing the solid material with deionized water to neutrality, and drying at 120 ℃ to constant weight to obtain a modified activated carbon carrier;
(4) weighing the carrier, placing the carrier in deionized water, controlling the temperature at 85 ℃, dropwise adding the solutions in the step (1) and the step (2) by adopting a coprecipitation method, adding a phosphoric acid solution with the mass fraction of 10%, and controlling the pH value of the system to be 9; after the precipitation is completed, aging the reaction solution at 70 ℃ for 48 h;
(5) and (3) filtering the reaction liquid in the step (4), washing the precipitate by deionized water, drying at 100 ℃, calcining at 550 ℃ in a muffle furnace for 4 hours, and then grinding into particles of 120 meshes to obtain the catalyst.
Mixing pure benzene and the catalyst in a reactor, wherein the dosage of the catalyst is 15% of the mass of the pure benzene, and then adding the mixture into an evaporator for evaporation; adding benzene steam into a tubular reactor for reaction; after the reaction was completed, the reaction mixture was cooled.
The sample was analyzed by chromatography, and the terphenyl content was 94.67%.
Claims (7)
1. The synthesis process of hydrogenated terphenyl heat conduction oil is characterized by comprising biphenyl synthesis, distillation and hydrogenation processes, wherein pure benzene and a catalyst are used for high-temperature reaction in a reactor in the biphenyl synthesis process, the catalyst comprises a carrier and an active component, and the active component accounts for 10% -35% of the mass of the carrier; the carrier is modified active carbon or a molecular sieve, and the active ingredients are CuMgAl, CuFeAl, CuFeZn and CaMgZn composite oxides.
2. The synthesis process of the hydrogenated terphenyl conduction oil as claimed in claim 1, wherein the molar ratio of Cu, Mg and Al in the CuMgAl composite oxide is 1:0.8-1.5:2, the molar ratio of Cu, Fe and Al in the CuFeAl composite oxide is 1:0.3-1.0:1.2-2.2, the molar ratio of Cu, Fe and Zn in the CuFeZn composite oxide is 1:0.1-0.5:0.6-1.2, and the molar ratio of Ca, Mg and Zn in the CaMgZn composite oxide is 1:2.3-3.8: 0.1-0.8.
3. The process for synthesizing hydrogenated terphenyl conduction oil according to claim 1, wherein the preparation process of the catalyst specifically comprises the following steps:
(1) weighing corresponding nitrate solution according to the molar ratio of different metals in the composite metal oxide to prepare metal salt solution with the mixed solution concentration of 0.10-0.50 mol/L;
(2) weighing sodium hydroxide or potassium hydroxide to prepare an alkali solution with the concentration of 0.8-1 mol/L;
(3) weighing carrier modified activated carbon or molecular sieve, placing the carrier modified activated carbon or molecular sieve in deionized water, controlling the temperature to be 85-90 ℃, simultaneously dripping the solutions in the step (1) and the step (2) by adopting a coprecipitation method, adding a phosphoric acid solution with the mass fraction of 10 +/-1%, and controlling the pH of the system to be 9-10; after the precipitation is completed, aging the reaction solution for 24-48h at 70-75 ℃;
(4) and (4) filtering the reaction liquid in the step (3), washing the precipitate with deionized water, drying at the temperature of 100-105 ℃, calcining for 1-5h at the temperature of 550-600 ℃ in a muffle furnace, and then grinding into particles with the particle size of less than 120 meshes to obtain the catalyst.
4. The process for synthesizing hydrogenated terphenyl conduction oil according to claim 1, wherein the modified activated carbon is prepared by: adding 10 +/-1 mass percent of phosphoric acid solution into 60-80-mesh active carbon particles, and soaking for 4-6 h; then ball milling the mixed material to 100-.
5. The process for synthesizing hydrogenated terphenyl conduction oil according to claim 1, wherein the molecular sieve support is ZSM-5 or ZSM-11.
6. The process for synthesizing hydrogenated terphenyl conduction oil according to claim 1, wherein the active component accounts for 20% -28% of the mass of the carrier; the carrier is modified activated carbon, and the active component is a CuFeZn and CaMgZn composite oxide; the mol ratio of Cu, Fe and Zn in the CuFeZn composite oxide is 1:0.2-0.3:0.8-1.0, and the mol ratio of Ca, Mg and Zn in the CaMgZn composite oxide is 1:3.0-3.3: 0.5-0.8.
7. The process for synthesizing hydrogenated terphenyl conduction oil according to claim 1, wherein the active component accounts for 23% of the mass of the carrier; the carrier is modified activated carbon, and the active ingredient is CuFeZn composite oxide; the mol ratio of Cu, Fe and Zn in the CuFeZn composite oxide is 1:0.25: 0.9.
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