Process of hydrodesulfurization and separate solvent extraction of distillate and deasphalted residual lubricating oil fractions

摘要

A process for the production of lubricating oils from petroleum stocks containing significant quantities of sulfur and lubricating oil components boiling above about 650° F. (343° C.) by subjecting such stocks to a series of steps comprising hydrodesulfurization, fractionation, and solvent extraction. The residual fraction obtained from the fractionation step may be deasphalted prior to solvent extraction.