Patent ID: 6663768
Filing Date: 2003-12-16
Classification: C10G

Abstract:
A process for preparing an oil suitable for use as a lubricating oil base stock comprising:(a) contacting a waxy feed over a dewaxing catalyst comprising a molecular sieve having 1-D pores with a pore diameter of between about 5.0 Ã¥ and about 7.0 Ã¥, and at least one Group VIII metal, at a pressure of from about 15 psig (103 kPa) to about 2500 psig (13.8 MPa) to partially dewax the feed by converting between 80% to 97% by weight 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 (b) solvent dewaxing the isomerized oil of step (a) to produce a lubricating oil base stock, whereby the lubricating base oil so produced by steps (a) and (b) has a viscosity index greater than 140 and a target pour point of less than or equal to âˆ’20Â° C. with a branching index of less than 1.75.