Patent ID: 7815789
Filing Date: 2010-10-19
Classification: C10G

Abstract:
1. A process to prepare a base oil having a target viscosity index of above 80 and a saturates content of above 90 wt % from a crude derived feedstock by comprising (a) contacting a crude derived feedstock in the presence of hydrogen with a catalyst comprising at least one Group VIB metal component and at least one non-noble Group VIII metal component supported on a refractory oxide carrier to produce an effluent; (b) adding to the effluent of step (a) or part of the effluent of step (a) a Fischer-Tropsch-derived fraction boiling at least partly in the base oil range, wherein the Fischer-Tropsch derived fraction is obtained by hydroisomerization of a Fischer-Tropsch synthesis product, in an amount effective to achieve the target viscosity index of the final base oil to produce a mixture; and (c) dewaxing the mixture as obtained in step (b).