Patent ID: 7513989

Claim:
A process for preparing lubricating oil basestocks which comprises: (a) contacting a hydrocarbon feedstock derived from at least one of thermal treatment, catalytic treatment, extraction, dewaxing or fractionation of a petroleum crude or fraction thereof, shale oil, tar sands or synthetic crude with a sulfided bulk metal catalyst under hydrocracking conditions, said catalyst comprising non-noble Group VIII metal molybdate in which at least a portion but less than all of molybdenum is replaced by tungsten, wherein the bulk metal catalyst prior to sulfidation is represented by the formula: (X) b (Mo) c (W) d O z wherein X is 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; and (b) fractionating hydrocracked feedstock to produce a distillate lubricating oil fraction.