COMPOSITE CATION EXCHANGE MEMBRANE AND ITS USE IN ELECTROLYSIS OF ALKALI METAL HALIDES

摘要

A composite film of fluorinated cation exchange polymer containing sulfonyl groups in ion exchange form whereby one surface of the film to a depth no more than one-third of the film's thickness contains the polymer at an equivalent weight of at least 250 greater than the equivalent weight of the polymer comprising the remaining thickness of the film. The film may be employed in an electrolytic cell in the production of halogen and alkali metal hydroxide from an alkali metal halide. In the cell the film separates the anode and cathode compartments with the high equivalent weight polymer side facing the cathode portion of the cell.