Process for the conversion of membranes of regenerated cellulose containing water, hidrofilas in membranes useful for release of liquid organic and.Process for release of at least one liquid organic, selected from a load

摘要

A hydrophilic, water-containing regenerated cellulose membrane is sequentially permeated under differential pressure with solvents of decreasing polarity so as initially to displace water in the membrane with a first solvent, and the or each other solvent in the sequence displacing the previous solvent. Each solvent has bulk liquid-liquid miscibility with the adjacent solvent(s) in the sequence, and the final solvents of the sequence exhibits bulk liquid-liquid miscibility with a material ultimately desired to be selectively permeated through the membrane. The first solvent is a lower (C1-C4) alcohol or acetone. The resulting membrane is practically suitable for at least partially separating, by permeation, a solvent used in dewaxing a waxy hydrocarbon oil from a solution of the oil and solvent.