Abstract:

The low viscosity PAO was synthesized by the oligomerization of olefin from coal with metallocene catalyst systems by kettle type polymerization. The effect of reaction conditions, such as mass fractions of the catalyst and co-catalyst, reaction temperature and reaction time on the conversion of stock and component distribution of PAO were examined. It is found that the optimum conditions are metallocene mass fraction 0.01%, proportion of co-catalyst and catalyst 9, the quality of organic boride and metallocene 2, reaction temperature of 115 ℃, reaction time of 2.5 h for the reaction system, under the optimum conditions, a low viscosity, high flash point, low pour point, low evaporation loss of PAO synthetic basestock with the kinetic viscosity of 8.15 mm2/s at 100 ℃, the viscosity index 158, the pour point -54 ℃, the flash point 286 ℃, the evaporation loss by Noack method 3.74% are obtained. The chromatographic analysis indicates that the produced PAO consists of a large part of tetramer, pentamer and a small part of trimer and hexamer. The same results are well repeated.

Key words: alpha-olefin from coal, PAO base oil, metallocene catalyst