Process for improving bright stock raffinate oil production

摘要

A process of increasing the production of Bright Stock oil in a lube oil process scheme. Aromatic extract oil (38, Fig.1), after being separated from the extraction solvent, is recycled (40) back to the deasphalter unit (24) and combined with a vacuum residuum (from 20) in 10-20 LV%, based on the total deasphalter feed, prior to deasphalting. After deasphalting and aromatics extraction (32) the absolute yield of raffinate (36) is increased.