Ionic complex for enhancing performance of water treatment membranes
AssigneeThe Dow Chemical Company
InventorsRitchie A. Wessling, Sharon S. Whipple, Richard F. Fibiger
Life of this patent
Estimating the term…
Abstract
A reverse osmosis membrane bearing an ionic complex and a method of making the membrane is described. The ionic complex is formed from a first compound bearing at least one quaternary ammonium or pyridinium group and a second compound bearing at least one sulfonate or carboxylate group. The complex enhances solute rejection of the membrane.
Claims17
An improved reverse osmosis membrane comprising a semipermeable reverse osmosis membrane having a first discriminating layer as a supporting surface and affixed to the supporting surface is a second thin film layer comprising an ionic complex of a first compound bearing at least one quaternary ammonium, imidazolinium or pyridinium group and a second compound bearing at least one carboxylate, phosphonate or sulfonate group, with the proviso that at least one of the first and second compounds is a polymer or prepolymer and also bears an average of more than one ionic group per molecule.
Dependencies are inferred from the claim text.