Patent ID: 7074320

Claim:
A process for preparing an oil suitable for use as a lubricating oil base stock comprising: a) sulfiding a dewaxing catalyst comprising a molecular sieve having 1-D pores with a pore diameter of between about 5.0 â„« and about 7.0 â„«, and at least Group VIII metal; and thereafter b) contacting a waxy feed over the catalyst contained in step a) at a pressure of from about 15 psig (103 kPa) to about 2500 psig (13.8 Pa) to partially dewax the feed by converting between 80% to 97% of the wax contained in the waxy feed thus producing an isomerized oil having a pour point of at least 6Â° C. above a target pour point; and, thereafter c) solvent dewaxing the isomerized oil obtained in step b) to produce a lubricating oil base stock having a viscosity index of greater than 140, a target pour point of less than or equal to âˆ’20Â° C. and a branching index of less than 1.75.