Patent ID: 11873455
Assignee: CHEVRON U.S.A. INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 14:
15. A process for preparing base oil from a waxy hydrocarbon feedstock comprising:
a) hydrotreating the waxy hydrocarbon feedstock;
b) contacting the hydrotreated waxy hydrocarbon feedstock in a hydroisomerization zone under hydroisomerization conditions in the presence of hydrogen and an inert gas, with total pressure in the zone at least 400 psig and the volume ratio of hydrogen to inert gas ranging from 0.1 to 9.0; and
c) collecting a product from the hydroisomerization in b), and passing the product to a hydrofinishing reactor; and
d) collecting a product from the hydrofinishing reactor and separating the product into base oil products and fuel products with the base oil products being recovered, and with the recovered base oil yield being increased relative to using only hydrogen in the hydroisomerization zone.