Cation exchange membranes of improved permselectivity

Details Cation exchange membranes of improved permselectivity Cation exchange membranes of improved permselectivity

C - Chemistry, Metallurgy

25

B

18/13, 204/202,

C25B 1/46 (2006.01)

Patent

CA 1071572

ABSTRACT OF THE DISCLOSURE Fluorinated cation exchange polymers are obtained from intermediate fluorinated polymers containing pendant sulfonyl halide groups which polymers are reacted with a di- or polyamine and subjected to elevated temperature of the order of 170 to 300°C. The polymers are desirably employed with pendant side groups in the salt form. In the form of film with ion-exchange sites on at least one surface the polymers possess permselectivity giving desirable performance in electrolytic cells such as chlor-alkali cells as well as membrane ion exchanger and reverse osmosis devices.

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