Patent ID: 6261441
Filing Date: 2001-07-17
Classification: C10G

Abstract:
An integrated hydroprocessing process for upgrading a gas oil hydrocarbon feedstock having a paraffin content of no more than 30 wt %, an initial boiling point of at least 3150C. into a naphtha product, a distillate product boiling above the naphtha range and a lubricant product, the process comprising:(a) hydrocracking the hydrocarbon feedstock over an aromatic-selective hydrocracking catalyst which is selected from the group consisting of zeolite X, zeolite Y, ZSM-3, ZSM-18 ZSM-20, MCM-22, mordenite and zeolite beta, the catalyst having an acidic functionality and hydrogenation-dehydrogenation functionality, under hydrocracking conditions at a hydrogen partial pressure of at least 7000 kPa and from 15 to 80 wt % conversion to lower boiling products, to form a naphtha product, a distillate product, and a bottoms fraction enriched in paraffinic components;(b) separating the naphtha product, the distillate product and the bottoms fraction;(c) hydroprocessing the separated bottoms fraction over at least one hydroprocessing catalyst, wherein the hydroprocessing catalyst comprises a zeolite possessing a framework silica:alumina ratio above 200:1, which performs dewaxing;(d) separating the effluent from step (c) into a bottoms fraction and a fraction boiling below the bottoms range, wherein at least a portion of the bottoms fraction is recycled to step (a) and the lower boiling fraction is separated into naphtha and distillate products;(e) the bottoms fraction not recycled to step (a) is used as a lubricant basestock.