Treatment of perfluorinated polymer membranes containing...

Details Treatment of perfluorinated polymer membranes containing... Treatment of perfluorinated polymer membranes containing...

C - Chemistry, Metallurgy

08

J

204/96.24

C08J 5/22 (2006.01)

Patent

CA 1200525

Treatment of perfluorinated polymer membranes containing carboxyl groups for alkali metal chloride electrolysis ABSTRACT OF THE DISCLOSURE In the treatment of a perfluorinated polymer membrane containing acid ion exchanger groups in a corona discharge, the improvement which comprises employing a membrane containing carboxyl groups and maintaining the membrane at a temperature below about 80°C during the discharge treatment. Advantageously the corona discharge treatment is carried out intermittently, the temperature is maintained at about -10 to +22°C, during the treatment the average rate of irradition is below about 2 Ah/m2, the frequency of the corona discharge is from about 5 to 15 kHz, the voltage for producing the corona discharge is from about 1 to 20 kV and the dose is from about 0.1 to 10 Ah/m2 of membrane surface. The resulting membranes exhibit lowered resistance resulting in lower cell voltages when used in the electrolysis of sodium chloride.

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