Abstract: Poly-alpha-olefin(PAO) synthetic oil was synthesized from 1-decene with AlCl₃ catalyst at low temperature(<10 ℃) and high polymerization temperature. The effects of catalyst dosage, reaction time, high polymerization temperature on PAO properties were investigated. The optimum process conditions were determined, viz. a catalyst dosage of 3% (based on raw materials), a reaction time of 10 h at low temperature and a polymerization temperature of 80 ℃ for 2 h. At the optimum conditions, the PAO yield was 90.88% with the kinematic viscosity (100 ℃) of 62.66 mm²/s and the viscosity index of 163, the flash point of 295 ℃, and the pour point of 45 ℃. Under the hydrogenation conditions covering a temperature of 230 ℃, a pressure of 4.0 MPa, a LHSV of 0.2 h^-1 and a hydrogen-oil ratio of 300, the hydrogenated PAO was obtained with the kinematic viscosity (100 ℃) of 60.07 mm ² /s, the viscosity index of 161, the flash point of 290 ℃, and the pour point of －40 ℃.

Key words: low temperature, high concentration, poly-α-alkene synthetic oil, solution polymerization, hydrofining