Method of improving current efficiency of cation- exchange...

Details Method of improving current efficiency of cation- exchange... Method of improving current efficiency of cation- exchange...

C - Chemistry, Metallurgy

25

B

18/13, 204/202

C25B 13/08 (2006.01) C08J 5/22 (2006.01) C25B 1/46 (2006.01)

Patent

CA 1091406

ABSTRACT OF THE DISCLOSURE A homogeneous cation-exchange membrane made of at least one fluorinated polymer having cation-exchangeable groups is swollen with a water miscible organic solvent and then the solvent is removed from the swollen membrane. The fluorinated polymer having cation-exchangeable groups has special character- istics to the water-miscible organic solvent because the cation-exchangeable groups having high affinity to the water- miscible organic solvent though the base of the fluorinated polymer may have water- and oil-repellent properties, whereby the cation-exchange membrane of the fluorinated polymer having cation-exchangeable groups is modified to reduce the permeability of hydroxyl ions by swelling it and removing the water-miscible organic solvent.

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