HYDROCONVERSION PROCESS FOR MAKING LUBRICATING OIL BASESTOCKS

摘要

A process for producing a lubricating oil basestock having at least 90 wt % saturates and a VI of at least 105 by solvent extracting a feedstock in unit (20) to produce a raffinate, solvent dewaxing the raffinate, selectively hydroconverting the solvent dewaxed raffinate in a two step hydroconversion zone which comprises a first hydroconversion unit (42) and to a second hydroconversion unit (52) followed by a hydrofinishing zone in hydrofinishing unit (60) and a dewaxing zone in unit (74).