PROCESS FOR THE MANUFACTURE OF LUBRICATING BASE OILS

摘要

Lubricating base oils having a high viscosity index, preferably at least 135, are manufactured by catalytic hydroisomerisation of a hydrocarbonaceous feedstock, derived from a waxy crude oil, which feedstock has not been treated to remove a lubricating base oil fraction and which feedstock contains at least 30% by weight wax and has at least 80% by weight boiling above 300 .degree.C and at most 30% by weight boiling above 540 .degree.C.