POLYIMIDE MEMBRANES FOR RECOVERY OF AROMATIC SOLVENTS UNDER HYPERFILTRATION CONDITIONS

摘要

Symmetric hyperfiltration membranes and their method of prepara tion and use are disclosed. The membranes are fashioned from polyimides and conditioned with a lubricating oil. Permselective separation of aromatic hydrocarbons from non-aromatic hydrocarbons in a feed stream may be accomplished using the membranes under hyperfiltration conditions.