Abstract: Synthetic, organic, polymeric membranes were prepared from polyethylenimine for use with pervaporation apparatus in the separation of ethanol-water mixtures. The polymeric material was prepared in dilute aqueous solution and coated onto a polysulfone support film, from which excess polymeric material was subsequently removed. Cross-links were then generated by limited exposure to toluene-2,4-diisocyanate solution, after which the prepared membrane was heat-cured. The resulting membrane structures showed high selectivity in permeating ethanol or water over a wide range of feed concentrations.
Type:
Grant
Filed:
June 19, 1985
Date of Patent:
April 21, 1987
Assignee:
United States Department of Energy
Inventors:
Hermann H. Neidlinger, Paul O. Schissel, Richard A. Orth