| 摘要 |
<p>A bottoms fraction of fuels hydrocracking which boils above about 316 °C (600 °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 °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 °C (about 20 °F). Typically, the bottoms fraction is produced in a moderate pressure fuels hydrocracking process over a bifunctional amorphous catalyst.</p> |
