C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/156, 204/57.
C25B 1/00 (2006.01) B01D 61/44 (2006.01) C25B 1/34 (2006.01) C25B 9/00 (2006.01)
Patent
CA 1066222
Abstract of the Disclosure 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 contain- ing 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 from that of the alkali metal sulfate and spent alkali metal chloride and chlorate mixtures. The process is particularly useful in producing chlorine and chlorine dioxide for woodpulp bleaching and in producing alkali metal sulfate free of sulfuric acid, for processes utilizing such sulfate.
216849
Eng Jeffrey D.
Harke Cyril J.
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