LUBRICANT HYDROCRAKING PROCESS

摘要

A bottoms fraction of fuels hydrocracking which boils above about 316 DEG C (600 DEG F) and contains at least about 10 wt.% aromatics is converted to a reduced aromatics lube base stock product over a catalyst comprising a crystalline material which exhibits unusually large sorption capacity demonstrated by its benzene adsorption capacity of greater than about 15 grams benzene/100 grams anhydrous crystal at 7 kPa (50 torr) and 25 DEG C and a hydrogenation-dehydrogenation functionality, preferably palladium, under high pressure conditions sufficient to reduce the aromatics content to about 10 wt.%. The bottoms fraction is dewaxed prior to high pressure hydroprocessing over a catalyst comprising HZSM-5 to reduce the pour point of the fraction to -7 DEG C (about 20 DEG F). Typically, the bottoms fraction is produced in a moderate pressure fuels hydrocracking process over a bifunctional amorphous catalyst.