Poly-alpha-olefin base oil and preparation method thereof
A base oil and olefin technology, applied in the field of olefin polymerization, can solve the problems of low viscosity of PAO base oil, and achieve the effects of easy product separation, reducing environmental pollution and avoiding corrosion
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[0043] The preparation method of polyalpha-olefin base oil provided by the invention comprises the following steps:
[0044] S1. Under the conditions of temperature 50℃~120℃, pressure 0.1~1.0MPa, α-olefin / solvent volume ratio 1:0~1:1, use Cr-AlCl 3 / Al 2 o 3 The solid-supported catalyst catalyzes the oligomerization reaction of α-olefin mixture for 3 to 8 hours;
[0045] S2. After stopping the reaction, filter the catalyst, wash with distilled water, remove the solvent by distillation under normal pressure, remove unreacted α-olefin and part of α-olefin dimer by distillation under reduced pressure, and obtain polyα-olefin base oil through hydrogenation and hydrogenation.
[0046] Among them, the Cr-AlCl 3 / Al 2 o 3 The immobilized catalyst is prepared by a liquid-phase immobilized method, comprising the following steps:
[0047] (1) Add sodium hydroxide solution to the chromium acetate solution, adjust the pH of the solution to 7.5-8.5, react with the gamma-alumina carri...
Embodiment 1
[0050] 1. Preparation of supported catalyst:
[0051] (1) Slowly add 5 (weight)% sodium hydroxide solution in the chromium acetate solution of 2.0 liters of 2.0M (mol / liter), adjust the pH of the solution to 8.0, and immediately join 1 kilogram of gamma-alumina (Al 2 o 3 ) carrier in a stirred reactor at room temperature and under stirring conditions for 2 hours, filter the carrier and dry it in a vacuum oven at room temperature, and then roast it at 600°C for 4 hours under the protection of an inert gas to obtain Cr / γ-Al 2 o 3 catalyst;
[0052] (2) 100 grams of anhydrous aluminum trichloride is made into a solution in 3.0 liters of toluene solvent, and added to 600 grams of Cr / γ-Al 2 o 3 , kept at reflux temperature for 10 hours, removed the solvent, washed the solid catalyst with toluene, and dried in vacuo to obtain Cr-AlCl 3 / Al 2 o 3 catalyst;
[0053] The chlorine content in the supported catalyst obtained above is 11.6ω%, and the chromium content is 5.6ω%.
[...
Embodiment 2
[0059] 1. Preparation of supported catalyst:
[0060](1) Slowly add 5 (weight)% sodium hydroxide solution in the chromium acetate solution of 2.0 liters of 2.0M (mol / liter), adjust the pH of the solution to 7.5, and immediately add to 1 kilogram of gamma-alumina (Al 2 o 3 ) carrier in a stirred reactor at room temperature and under stirring conditions for 2 hours, filter the carrier and dry it in a vacuum oven at room temperature, and then roast it at 400°C for 8 hours under the protection of an inert gas to obtain Cr / γ-Al 2 o 3 catalyst;
[0061] (2) 200 grams of anhydrous aluminum trichloride is made into a solution in 3.0 liters of toluene solvent, and added to 600 grams of Cr / γ-Al 2 o 3 , kept at reflux temperature for 8 hours, removed the solvent, washed the solid catalyst with toluene, and dried in vacuo to obtain Cr-AlCl 3 / Al 2 o 3 catalyst;
[0062] The chlorine content in the obtained supported catalyst was 15.9ω%, and the chromium content was 4.7ω%.
[0063...
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