Process for improving membranes
AssigneeBen-Gurion University of the Negev Research and Development Authority
InventorsSophia Belfer, Rosalia Fainstein, Luba Kesselman, Charles Linder
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Abstract
The invention provides a process for improving the antifouling properties and for increasing the selectivity of commercial composite polyamide nanofiltration (NF) and reverse osmosis (RO) membranes comprising circulating a low concentration of water soluble monomers and an initiating redox couple in an aqueous solvent, without transverse pressure over the surface of the membrane thereby effecting a free-radical graft polymerization on the surface of the membrane.
Claims14
A process for improving the antifouling properties and for increasing the selectivity of commercial composite polyamide nanofiltration (NF) and Reverse osmosis (RO) membranes comprising circulating a low concentration of a water soluble monomers and an initiating redox couple in an aqueous solvent, without transverse pressure over the surface of the membrane, thereby effecting free-radical graft polymerization on the surface of the membrane to form a first grafted layer and grafting between 2 and 5 layers in sequence onto said first grafted layer;
- wherein the resulting membrane has an increased flux.
Dependencies are inferred from the claim text.