Direct contact type mineral oil dielectric cooling liquid and preparation method thereof

Abstract

The invention discloses a direct contact type mineral oil dielectric cooling liquid and a preparation method thereof, the cooling liquid comprises the following raw materials: mineral type naphthenic base white oil, an antioxidant and a light stabilizer, aromatic hydrocarbon of the mineral type naphthenic base white oil is completely hydrogenated and saturated and does not contain corrosive sulfur, nitrogen, oxygen and other heteroatoms, and the refined naphthenic base oil has good environmental protection property and good corrosion resistance. And moreover, the problem that the cable becomes hard after being soaked in the cooling liquid is solved, the compatibility with other materials is good, and the cooling liquid can have good compatibility with materials of a liquid cooling system without adding cable compatibilizers such as oily epoxy resin and a dispersing agent. The mineral oil type dielectric cooling liquid disclosed by the invention is colorless, transparent, good in environmental protection property, good in flowing property, fireproof safety performance, heat-conducting property, insulating property and oxidation stability, free of acidic substances and corrosion, less in water absorption in a use process, good in stability, excellent in compatibility with IT equipment materials, power lines and network cables, and good in corrosion resistance. And yellowing due to light and heat is not easily caused.

Description

Technical Field

[0001] The invention belongs to the field of liquid cooling of electronic devices of IT equipment, and in particular relates to a direct contact type mineral oil dielectric cooling liquid and a preparation method thereof. Background Art

[0002] With the innovative development of technologies such as artificial intelligence, cloud computing, big data, and blockchain, as well as the advent of the 5G communication era, computer technology has developed rapidly. In order to meet the challenges of network processing performance, IT equipment has continuously improved its processing capabilities and integration, resulting in a steady increase in power density. In addition to the huge energy consumption problem caused by these changes, high heat density also puts higher requirements on refrigeration equipment and technology.

[0003] Traditional air cooling technology faces bottlenecks in high heat density scenarios, and the heat dissipation efficiency can no longer keep up with the computing efficiency. Although the industry has been constantly innovating air cooling systems, the heat carrying capacity of air is far lower than that of liquid, and the cooling capacity of liquid is 1,000 to 3,000 times that of air. Liquid cooling technology has the characteristics of high efficiency, low energy loss, low dependence on buildings for deployment, and quietness and safety. Compared with air cooling, it has incomparable technical advantages. It is an excellent heat dissipation solution that can be applied to scenarios that require a significant increase in computing power, energy efficiency, and deployment density. It can meet the deployment of higher density under conditions of insufficient site power capacity. Therefore, when air cooling is no longer able to cope with high heat, liquid cooling technology gradually moves from behind the scenes to the foreground, attracting widespread attention in the industry.

[0004] In simple terms, the principle of liquid cooling is to use heat convection or heat conduction to remove the heat dissipated by the server through immersion or flow of liquid. The main liquid cooling methods for servers include cold plate liquid cooling, immersion liquid cooling and spray liquid cooling.

[0005] At present, the coolants used in liquid cooling technology mainly include water and fluorinated liquid. Among them: water is a non-insulator and can only be used in non-direct contact cold plate liquid cooling technology. Once a leak occurs, it will cause fatal damage to IT equipment; fluorinated liquid is the most widely used direct contact coolant for immersion, but it is expensive, volatile, has high cost of use, high density, and high load-bearing requirements for buildings. Because water and fluorinated liquid have the above disadvantages as coolants, the relevant industry actively studies and explores the use of oil coolants in direct contact liquid cooling, most of which are studies on synthetic oil and silicone oil coolants.

[0006] The characteristics of electronic components of IT equipment require that the coolant in direct contact with them should have good insulation performance, thermal conductivity, compatibility with materials, non-flammable safety performance, antioxidant stability and eco-friendly performance. At the same time, in order to promptly remove the heat emitted by electronic components, easy to clean and low pump power consumption, the coolant should have good flow performance. In order to keep the coolant's viscosity stable under low temperature and working temperature conditions, the coolant should have a higher viscosity index. At present, whether it is commercialized or patented coolants provided in public literature, the performance still needs to be improved when used as direct contact coolants for IT equipment electronic components.

[0007] A Chinese patent document with publication number CN 110862806 A discloses an electronic device coolant and a preparation method thereof, wherein dimethyl silicone oil, natural ester oil or synthetic ester oil is used as a base oil and an antioxidant and a dispersant are added to prepare the electronic device coolant. A Chinese patent document with publication number CN 113861948 A discloses a coolant and a preparation method and application thereof, wherein an immersion liquid cooling coolant is prepared using a defoamer, an oily epoxy resin, a dispersant, a siloxane, a flash point enhancer, and terminal hydroxyl polybutadiene as raw materials. Although synthetic oil or silicone oil is cheaper than fluorinated liquid, their prices are still relatively expensive. In comparison, mineral oil is cheap and has a good application prospect as a coolant for IT equipment.

[0008] In the existing technology of using mineral oil as IT equipment coolant, a Chinese patent document with publication number CN 107502309B discloses a coolant and a preparation method thereof, which is prepared by adding a trace amount of antioxidant, defoamer and dispersant to the traditional mineral base oil to obtain a coolant, which can be suitable for immersion direct cooling of IT equipment in an open environment. However, the coolant is easily yellowed by light and heat, and the coolant's oxidation stability (the antioxidant content is far less than the recommended dose, and the antioxidant performance can be ignored), insulation performance (breakdown voltage is only 30kV), low-temperature flow performance (pour point -27°C), compatibility with liquid cooling system materials, and friendly environmental protection performance to the ecological environment all need to be improved. In addition, there are many types of coolant additives and the composition is complex, which can easily make the coolant system unstable and affect the performance. Summary of the invention

[0009] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a direct contact mineral oil dielectric coolant and a preparation method thereof, so as to solve the problems in the prior art that the mineral oil dielectric coolant causes the cable to harden, and the coolant has poor oxidation stability, insulation performance, low temperature flow performance, environmental protection performance and is easily yellowed due to the influence of light and heat.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] Direct contact mineral oil dielectric coolant, calculated by mass percentage, includes 99.0% to 99.8% base oil and 0.2% to 1.0% additives; the base oil is mineral naphthenic white oil, the C A The value is 0 and the sulfur content is less than 20 mg / kg.

[0012] A further improvement of the present invention is:

[0013] Preferably, the additives include an antioxidant and a light stabilizer, the mass fraction of the antioxidant is 0.19% to 0.9%, and the mass fraction of the light stabilizer is 0.01% to -0.1%.

[0014] Preferably, the antioxidant is one or more of 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butylphenol and alkyl diphenylamine.

[0015] Preferably, the light stabilizer is one or more of UV326, UV531 and UV328.

[0016] Preferably, the mineral naphthenic white oil contains no corrosive sulfur and heteroatoms.

[0017] Preferably, the kinematic viscosity of the mineral oil dielectric coolant at 40°C is 3 mm 2 / s~50mm 2 / s.

[0018] The preparation method of the direct contact type mineral oil dielectric coolant comprises the following steps: adding additives to base oil, heating and stirring until clear and transparent, cooling to room temperature, and filtering to obtain the mineral oil dielectric coolant.

[0019] Preferably, the heating temperature is 60°C to 70°C.

[0020] Preferably, the base oil is prepared from cycloalkane distillate oil through a high-pressure hydrogenation process.

[0021] Preferably, the preparation parameters of the base oil prepared by the high pressure hydrogenation process are: reaction temperature of 200°C to 500°C, reaction pressure of 10.0MPa to 20.0MPa, and space velocity of 0.2h -1 ~2.0h -1 , the hydrogen-to-oil ratio is 500:1 to 1500:1.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The invention discloses a direct contact type mineral oil dielectric coolant and a preparation method thereof. The raw materials of the coolant are mineral type naphthenic white oil, an antioxidant and a light stabilizer, wherein: the aromatic hydrocarbons of the mineral type naphthenic oil are completely hydrogenated and saturated, CA The value is 0, the sulfur content is less than 20mg / kg, there is no corrosive sulfur, no heteroatoms such as nitrogen and oxygen, and ordinary cycloalkyl oils contain aromatic hydrocarbons, which leads to poor environmental protection and poor material compatibility. After refining, this cycloalkyl base oil has good environmental protection, and solves the problem of cables being soaked in coolant and hardening. It is also very compatible with other materials. There is no need to add cable extenders such as oily epoxy resins and dispersants to make the coolant and liquid cooling system materials have good compatibility, reducing the types of additives. The mineral oil type dielectric coolant of the present invention is colorless and transparent, has good environmental protection, good flowability, fire safety performance, thermal conductivity, insulation performance and oxidation stability, no aromatic hydrocarbons and heteroatoms, no acidic substances, no corrosiveness, less water absorption during use, good stability, excellent compatibility with IT equipment materials, power cords, and network cables, and is not easily affected by light and heat and turns yellow. The mineral oil type dielectric coolant of the present invention can achieve the same performance as the synthetic dielectric coolant, and is easier to prepare than the synthetic oil type or silicone oil type coolant, has higher economic value, and is easy to realize industrial scale production.

[0024] Furthermore, the light stabilizer used in the present invention can prevent the coolant from turning yellow due to light and heat, and can also cooperate with the antioxidant to increase the oxidation stability. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with specific embodiments:

[0026] One of the embodiments of the present invention discloses a mineral oil-based dielectric coolant, wherein the raw materials include 99.0% to 99.8% of base oil and 0.2% to 1.0% of additives by mass percentage; the base oil is a mineral-based naphthenic white oil; and the additives include an antioxidant and a light stabilizer.

[0027] In the embodiment of the present invention, the C of mineral naphthenic white oil is A The value is 0, the sulfur content is less than 20 mg / kg, there is no corrosive sulfur, and there are no heteroatoms such as nitrogen and oxygen.

[0028] In the embodiment of the present invention, the antioxidant is one or more of 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butylphenol and alkyl diphenylamine, and the amount of the above antioxidant is 0.19% to 0.9%.

[0029] In the embodiment of the present invention, the light stabilizer is one or more of UV326, UV531 and UV328, and the amount of the light stabilizer is 0.01% to 0.1%.

[0030] The kinematic viscosity of the mineral oil dielectric coolant at 40°C is 3 mm 2 / s~50mm 2 / s.

[0031] One of the embodiments of the present invention discloses a method for preparing a mineral oil-based dielectric coolant, comprising weighing a required amount of base oil, sequentially adding a required amount of a light stabilizer and an antioxidant to the base oil, heating and stirring until clear and transparent, cooling to room temperature, and filtering to obtain the dielectric coolant.

[0032] In the embodiment of the present invention, the heating temperature is 60° C. to 70° C. (this heating temperature makes the light stabilizer more soluble).

[0033] In the embodiment of the present invention, the mineral naphthenic white oil is prepared by using naphthenic distillate oil as raw material using high pressure hydrogenation process technology, and the preparation process conditions are: reaction temperature is 200℃~500℃, reaction pressure is 10.0MPa~20.0MPa, and space velocity is 0.2h -1 ~2.0h -1 , the hydrogen-to-oil ratio is 500:1 to 1500:1; the specific product is obtained by reacting under the above different reaction conditions to prepare C A The value is 0, the sulfur content is less than 20 mg / kg, there is no corrosive sulfur, and there is no mineral type naphthenic white oil with heteroatoms such as nitrogen and oxygen.

[0034] The raw materials of the mineral oil type dielectric coolant of the present invention are mineral type naphthenic white oil, antioxidant and light stabilizer, wherein: the aromatic hydrocarbons of the mineral type naphthenic oil are completely hydrogenated and saturated, C A The value is 0, the sulfur content is less than 20mg / kg, there is no corrosive sulfur, no nitrogen, oxygen and other heteroatoms, ordinary cycloalkane oil contains aromatic hydrocarbons, which leads to poor environmental protection and poor material compatibility. After refining, this cycloalkane base oil has good environmental protection, and solves the problem of cable hardening after soaking in coolant. It is also very compatible with other materials. There is no need to add oily epoxy resins and dispersants and other cable extenders to make the coolant and liquid cooling system materials have good compatibility, reducing the types of additives; antioxidants greatly improve the oxidation stability of dielectric coolants; light stabilizers can prevent coolants from turning yellow due to light and heat, and can also cooperate with antioxidants to increase oxidation stability. White oil is more sensitive to antioxidants and light stabilizers, so that the two agents can play a good role.

[0035] The mineral oil-based dielectric coolant of the present invention is colorless and transparent, has good environmental protection, has good flowability, fire safety, thermal conductivity, insulation and oxidation stability, contains no aromatic hydrocarbons and heteroatoms, no acidic substances, is non-corrosive, absorbs less water during use, has good stability, has excellent compatibility with IT equipment materials, power cords, and network cables, and is not easily affected by light and heat and turns yellow. The mineral oil-based dielectric coolant of the present invention can achieve the same performance as the synthetic dielectric coolant, and is easier to prepare and has higher economic value than synthetic oil-based or silicone oil-based coolants, and is easy to realize industrial-scale production.

[0036] The following is a further analysis in conjunction with specific embodiments:

[0037] An example of the reaction conditions for preparing naphthenic white oil from naphthenic distillate oil is shown in Table 1.

[0038] Table 1 Reaction conditions for preparing naphthenic white oil from naphthenic distillate oil

[0039] project Example 1 Example 2 Example 3 Naphthenic distillate fraction, ℃ 260-340 300-360 280-350 Reaction temperature, °C 200 500 350 Reaction pressure, MPa 20.0 10.0 15.0 <![CDATA[Air speed, h -1 > 2.0 0.2 1.1 Hydrogen to Oil Ratio 500:1 1500:1 1000:1 Naphthenic white oil A B C

[0040] Example 4

[0041] The mineral oil type dielectric coolant comprises raw materials by mass percentage: 99.34% of mineral type naphthenic white oil A; 0.6% of 2,6-di-tert-butyl-p-cresol; and 0.06% of UV326 as a light stabilizer. The mineral type naphthenic white oil, 2,6-di-tert-butyl-p-cresol, and light stabilizer UV326 are weighed according to the above mass percentages, and the light stabilizer UV326 and 2,6-di-tert-butyl-p-cresol are added to the mineral type naphthenic white oil in sequence, and the mixture is heated to 65°C, stirred and mixed until clear and transparent, and then cooled to room temperature and filtered to obtain the mineral oil type dielectric coolant.

[0042] Example 5: The mineral oil type dielectric coolant, the raw materials include by mass percentage: mineral type cycloalkyl white oil B is 99.71%; 2,6-di-tert-butylphenol is 0.19%; light stabilizer UV326 is 0.1%. After weighing the mineral type cycloalkyl white oil, 2,6-di-tert-butylphenol, and light stabilizer UV326 according to the above mass percentages, add light stabilizer UV326 and 2,6-di-tert-butylphenol to the mineral type cycloalkyl white oil in sequence, mix the three, heat to 70°C, stir and mix until clear and transparent, then cool to room temperature, and filter to obtain the mineral oil type dielectric coolant.

[0043] Example 6: The mineral oil type dielectric coolant, the raw materials include by mass percentage: 99.09% of mineral type naphthenic white oil C; 0.9% of alkyl diphenylamine; 0.01% of light stabilizer UV531. Mineral type naphthenic white oil, alkyl diphenylamine, and light stabilizer UV531 are weighed according to the above mass percentages, light stabilizer UV531 and alkyl diphenylamine are added to the mineral type naphthenic white oil in sequence, the three are mixed, heated to 60°C, stirred and mixed until clear and transparent, then cooled to room temperature, and filtered to obtain the mineral oil type dielectric coolant.

[0044] Comparative Example 1: The difference from Example 6 is that no light stabilizer is added, and the other components and amounts are the same as those in Example 6.

[0045] Comparative Example 2: Commercially available common mineral-type cycloalkane coolant containing aromatic hydrocarbons.

[0046] The comparison of the light and heat stability performance of Example 6 and Comparative Example 1 is shown in Table 2.

[0047] Table 2 Comparison of light and heat stability performance

[0048]

[0049] It can be seen from Table 2 that the light and heat stability of the coolant in Example 6 to which 0.01% light stabilizer UV531 is added is significantly better than that of the coolant in the comparative example to which no light stabilizer UV531 is added, indicating that the light stabilizer UV531 can improve the light and heat stability of the coolant.

[0050] The dielectric coolants prepared in Examples 4 to 6 and the commercially available common mineral-type cycloalkyl coolant containing aromatic hydrocarbons in Comparative Example 2 were tested for compatibility with rubber, wires, etc. in IT equipment.

[0051] The compatibility test conditions are: immerse the material in coolant, 30 ml of coolant per gram of material, the test temperature is 80°C, and the immersion time is one month.

[0052] After the compatibility test, the material was taken out of the test cup, washed and dried, and the mass change rate, volume change rate and hardness change of the material were tested. The test method is shown in Table 3, and the results are shown in Table 4.

[0053] The properties and performance comparison of Comparative Example 2 and Examples 4 to 6 are shown in Table 4.

[0054] Table 3 Test methods for material compatibility test

[0055] Test Name Quality change rate Volume change rate Hardness change Test Method Weighing method GB / T 14832 GB / T 6031

[0056] Table 4 Comparison of properties of coolants in Examples 4 to 6 and commercially available mineral oil coolants

[0057]

[0058]

[0059] It can be seen from Table 4 that the common mineral naphthenic cooling fluid containing aromatic hydrocarbons on the market contains aromatic hydrocarbons (C A The value is 4.5%), Example 4-Example 6 C AThe value is 0 (i.e., the aromatic content is 0); compared with the commercially available common mineral cycloalkyl coolant containing aromatics in Comparative Example 2, the insulation performance (higher breakdown voltage), thermal conductivity (larger thermal conductivity), fire safety performance (higher flash point), oxidation stability (longer rotating oxygen bomb time), biodegradability, toxicity, and viscosity-temperature performance (higher viscosity index) of Examples 4 to 6 are better, and the coolants of Examples 4 to 6 are not easy to absorb water, do not contain corrosive sulfur, nitrogen and acidic substances, and have a lower sulfur content; after a month of compatibility testing with nitrile rubber, EPDM, polytetrafluoroethylene, fluororubber and 4 different materials of power cords and ordinary network cables, the mass change rate, volume change rate, and hardness change value of the coolants of Examples 4 to 6 with each material are much smaller than those of the commercially available mineral oil cycloalkyl coolants, and the compatibility results of the coolants of Examples 4 to 6 with these materials are very good, indicating that electronic devices can be safely immersed in these coolants.

[0060] Table 5 Reaction conditions for preparing naphthenic white oil from naphthenic distillate oil

[0061] project Example 7 Example 8 Example 9 Example 10 Naphthenic distillate fraction, ℃ 260-340 300-360 280-350 280-350 Reaction temperature, °C 300 400 450 250 Reaction pressure, MPa 12 15.0 18 13 <![CDATA[Air speed, h -1 > 0.5 0.8 1.5 2 Hydrogen to Oil Ratio 800:1 1200:1 600:1 700:1 Naphthenic white oil D E F G

[0062] Embodiment 11

[0063] The mineral oil type dielectric coolant comprises raw materials by mass percentage: 99.2% of mineral type naphthenic white oil D; 0.7% of 2,6-di-tert-butyl-p-cresol; and 0.1% of light stabilizer UV326. The mineral type naphthenic white oil, 2,6-di-tert-butyl-p-cresol, and light stabilizer UV326 are weighed according to the above mass percentages, and the light stabilizer UV326 and 2,6-di-tert-butyl-p-cresol are added to the mineral type naphthenic white oil in sequence, and the mixture is heated to 65°C, stirred and mixed until clear and transparent, and then cooled to room temperature and filtered to obtain the mineral oil type dielectric coolant.

[0064] Example 12

[0065] The mineral oil type dielectric coolant comprises raw materials by mass percentage: 99.8% of mineral type naphthenic white oil E; 0.19% of 2,6-di-tert-butyl-p-cresol; and 0.01% of light stabilizer UV326. The mineral type naphthenic white oil, 2,6-di-tert-butyl-p-cresol, and light stabilizer UV326 are weighed according to the above mass percentages, and light stabilizer UV326 and 2,6-di-tert-butyl-p-cresol are added to the mineral type naphthenic white oil in sequence, and the mixture is heated to 70°C, stirred and mixed until clear and transparent, then cooled to room temperature, and filtered to obtain the mineral oil type dielectric coolant.

[0066] Example 13

[0067] The mineral oil type dielectric coolant comprises raw materials by mass percentage: 99.0% of mineral type naphthenic white oil F; 0.9% of 2,6-di-tert-butylphenol; and 0.1% of light stabilizer UV328. The mineral type naphthenic white oil, 2,6-di-tert-butylphenol, and light stabilizer UV328 are weighed according to the above mass percentages, and light stabilizer UV328 and 2,6-di-tert-butylphenol are added to the mineral type naphthenic white oil in sequence, and the mixture is heated to 62° C., stirred and mixed until clear and transparent, and then cooled to room temperature, and filtered to obtain the mineral oil type dielectric coolant.

[0068] Embodiment 14

[0069] The mineral oil type dielectric coolant comprises raw materials by mass percentage: 99.5% of mineral type naphthenic white oil G; 0.45% of alkyl diphenylamine; and 0.05% of UV531 as a light stabilizer. The mineral type naphthenic white oil, alkyl diphenylamine, and light stabilizer UV531 are weighed according to the above mass percentages, and the light stabilizer UV531 and alkyl diphenylamine are added to the mineral type naphthenic white oil in sequence, and the mixture is heated to 68°C, stirred and mixed until clear and transparent, and then cooled to room temperature and filtered to obtain the mineral oil type dielectric coolant.

[0070] In summary, the mineral oil-based dielectric coolant and the preparation method thereof of the present invention provide a direct contact mineral oil-based dielectric coolant. The preparation method of the coolant is simple to operate. The obtained mineral oil-based dielectric coolant is colorless and transparent, has good flowability, fire safety performance, thermal conductivity, insulation performance and oxidation stability, is free of aromatic hydrocarbons and heteroatoms, free of acidic substances, and non-corrosive. It absorbs less water during use, is not easily affected by light and heat and turns yellow, has good stability, and has excellent compatibility with IT equipment materials, power cables, and network cables.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Direct contact mineral oil dielectric coolant, characterized in that: In terms of mass percentage, the base oil comprises 99.0% to 99.8% and the additives comprise 0.2% to 1.0%; the base oil is a mineral naphthenic white oil, the C A The value is 0 and the sulfur content is less than 20 mg / kg.

2. The direct contact mineral oil dielectric coolant according to claim 1, characterized in that: The additives include antioxidants and light stabilizers. The mass fraction of the antioxidant is 0.19% to 0.9%, and the mass fraction of the light stabilizer is 0.01% to 0.1%.

3. The direct contact mineral oil dielectric coolant according to claim 2, characterized in that: The antioxidant is one or more of 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butylphenol and alkyl diphenylamine.

4. The direct contact mineral oil dielectric coolant according to claim 2, characterized in that: The light stabilizer is one or more of UV326, UV531 and UV328.

5. The direct contact mineral oil dielectric coolant according to claim 1, characterized in that: The mineral naphthenic white oil contains no corrosive sulfur and heteroatoms.

6. The direct contact mineral oil dielectric coolant according to any one of claims 1 to 5, characterized in that: The kinematic viscosity of the mineral oil dielectric coolant at 40°C is 3 mm 2 / s~50mm 2 / s.

7. The method for preparing the direct contact mineral oil dielectric coolant according to claim 1, characterized in that: The method comprises the following steps: adding additives into base oil, heating and stirring until the oil is clear and transparent, cooling the oil to room temperature, and filtering the oil to obtain a mineral oil dielectric coolant.

8. The method for preparing the direct contact mineral oil dielectric coolant according to claim 7, characterized in that: The heating temperature is 60℃~70℃.

9. The method for preparing the direct contact mineral oil dielectric coolant according to claim 7, characterized in that: The base oil is prepared from naphthenic distillate oil through a high-pressure hydrogenation process.

10. The method for preparing the direct contact mineral oil dielectric coolant according to claim 9, characterized in that: The preparation parameters of the base oil prepared by high-pressure hydrogenation process are: reaction temperature is 200℃~500℃, reaction pressure is 10.0MPa~20.0MPa, and space velocity is 0.2h -1 ~2.0h -1 , the hydrogen-to-oil ratio is 500:1 to 1500:1.

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