Patent ID: 11873453
Assignee: EXXONMOBIL TECHNOLOGY AND ENGINEERING COMPANY
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 21:
22. A method of upgrading Group II base stock to Group II+, Group III or Group III+ base stock comprising the steps of:
adsorbing one or more high VI components of a first Group II base stock having a first Group II viscosity index with a Beta zeolite, wherein the first Group II base stock and a first solvent contact the Beta zeolite to provide a second Group II base stock having a viscosity index less than the first Group II base stock viscosity index; and
desorbing the Beta zeolite, wherein the Beta zeolite is contacted with the first solvent or a second solvent to produce a Group II+, Group III or Group III+ base stock having a viscosity index greater than 120.