Production of lube base stocks by catalytic and solvent dewaxing

摘要

Lube base stocks and lube stock compositions, and process for preparing them are disclosed. The lube oils preferably have a viscosity index above about 115. The process involves obtaining feedstocks that have a 95% point below 1150{F and feedstocks that have 95% point above 1150{F. The feedstocks that have a 95% point below 1150{F are catalytically dewaxed, and the feedstocks that have 95% point above 1150{F are solvent dewaxed. The products can be blended, combined with additives. Hydrotreatment may be performed on the lube base stocks to remove olefins, oxygenates and other impurities. The fractions may be obtained from Fischer-Tropsch synthesis. One or more of the fractions can also be obtained from other sources. Also disclosed is a process for preparing lube base stocks having a pour cloud spread less than 30{C.