Electrolytic-electrodialytic and chemical manufacture of chlorine dioxide, chlorine and chloride-free alkali metal hydroxide

摘要

Chlorine dioxide, chlorine, alkali metal hydroxide, alkali metal sulfate and hydrogen are made from alkali metal chloride, alkali metal chlorate, hydrogen chloride, sulfuric acid and water in an electrolytic-electrodialytic cell containing at least seven compartments and having alternating anion-active and cation-active permselective membranes separating the compartments. By feeding particular reactants or mixtures thereof to certain compartments from which component ions selectively diffuse to other compartments under influence of the applied voltage, reactions take place in the compartments, selectively yielding chlorine dioxide and chlorine mixtures, alkali metal sulfate, hydrogen, substantially chloride-free alkali metal hydroxide, spent sulfuric acid from a different compartment than that of the alkali metal sulfate and spent alkali metal chloride and chlorate mixtures.