METHOD OF PRODUCING FLUOROCONTAINING ION-EXCHANGE MEMBRANE

摘要

An ion exchange film comprises a fluorine-containing polymer with (1) ion exchange sites present in a first layer as N-monosubstituted sulfonamido groups or salt thereof formed through reaction of a primary amine and (2) ion exchange sites present in a second layer of the film other than as said N-monosubstituted group or salt thereof. The film is suitable as a separator in a cell for electrolysis of an alkali or alkaline earth metal halide particularly sodium chloride in producing hydrogen, chlorine and caustic soda. In making concentrated caustic soda, high current efficiencies have been obtained in operation of the cell.