METHOD FOR PRODUCING LUBRICATING BASE OIL WITH LOW CLOUD POINT AND HIGH VISCOSITY INDEX

摘要

A method for producing a lubricating base oil with low cloud point and high viscosity index is provided. The method uses a highly waxy distillate oil having an initial boiling point of 300-460?, a wax content of 5% or more, a pour point of -20? or more and a cloud point of -5? or more as a raw material. The lubricating base oil having a low pour point, a low cloud point and a high viscosity index is produced by pre-hydrorefining, isomerized/asymmetrical cracking and supplementary refining in the presence of hydrogen, with premium naphtha and middle fraction oil being co-produced. The method is characterized mainly in the high yield of heavy base oil, low pour point and the cloud point, and high viscosity and viscosity index of the base oil.