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Abstract

Semipermeable composite membranes which comprise a porous substrate of a homo- or copolymer on the basis of acrylonitrile are provided, which have been cross-linked, and at least two layers of film-forming polymers coated thereon, a first layer of monomeric or polymeric diazonium salts which have been reacted with themselves and with an at least difunctional compound, and a second layer, which is chemically bonded to the first one, of a cross-linked, ionically charged hydrophilic polymer. The membranes show good mechanical, physical and chemical stabilities, preferably solvent stability, and are useful in reverse osmosis and ultrafiltration processes, particularly for desalting solutions of low molecular weight organic compounds.

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First Claim