PROCESS FOR PRODUCING LIGHT NEUTRAL BASE OIL HAVING A HIGH VISCOSITY INDEX

摘要

A process is disclosed for producing light neutral base oil having VI greater than 120 comprising the steps of contacting a hydrocarbonaceous feedstock with a catalyst comprising a low acidity, highly dealuminated ultrastable Y zeolite and a catalytic amount of hydrogenation component to produce a converted fractionand an unconverted fraction boiling above 700°F; recovering at least a portion of the unconverted fraction; dewaxing at least a portion of the unconverted fraction; separating at leat a portion of the dewaxed unconverted fraction into a least a first distillate fraction and a second distillate fraction, said first distillate fraction comprising a lubricating base oil having a viscosity of from about 3 cSt to about 6 cSt at 100°C. and said second distillate fraction having a viscosity of greater than about 6 cSt at 100°C; and recovering at least a portion of the first distillate fraction.