Patent ID: 6620313
Filing Date: 2003-09-16
Classification: B01J,C07C,C08F,C10G

Abstract:
A process for selectively hydroconverting a raffinate produced from solvent refining a lubricating oil feedstock which comprises:(a) conducting the lubricating oil feedstock to a solvent extraction zone and separating therefrom an aromatics rich extract and a paraffins rich raffinate; (b) stripping the raffinate of solvent to produce a raffinate feed having a dewaxed oil viscosity index from about 80 to about 105 and a final boiling point of no greater than about 650Â° C.; (c) passing the raffinate feed to a first hydroconversion zone and processing the raffinate feed in the presence of a bulk metal catalyst under hydroconversion conditions wherein the bulk metal catalyst comprises a non-noble metal Group VIII molybdate in which at least a portion but less than all of the molybdenum is replaced by tungsten to produce a first hydroconverted raffinate; and (d) passing the first hydroconverted raffinate to a second reaction zone and conducting cold hydrofinishing of the first hydroconverted raffinate in the presence of a hydrofinishing catalyst under cold hydrofinishing conditions wherein the bulk metal catalyst is represented by the formula: (X)b(Mo)c(W)dOz wherein X is a non-noble Group VIII metal, the molar ratio of b: (c+d) is 0.5/1 to 3/1, the molar ratio of c:d is >0.01/1, and z=[2b+6(c+d)]/2.