C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/156, 204/58
C25B 1/00 (2006.01) C25B 1/26 (2006.01) C25B 1/28 (2006.01) C25B 1/46 (2006.01)
Patent
CA 1043736
ABSTRACT OF THE DISCLOSURE Chlorine dioxide, hydrogen peroxide, chlorine, alkali metal hydroxide and hydrogen are produced from alkali metal chloride, alkali. metal chlorate, sulfuric acid and water, utilizing an electrolytic cell having anode and cathode compartments separated by two intermediate buffer compartments, the boundaries between the anode and cathode compartments and the buffer compartments being of cation-active permselective membranes which are resistant to attack by the medium And the buffer compartments being separated by a suitable anion-active permselective membrane. On electrolysis, with sulfuric acid fed to the anode compartment, chloride and chlorate fed to the buffer compartment adjacent to the cathode compartment and water fed to the cathode compartment there are produced hydrogen and alkali metal hydroxide in the cathode compartment,chorine dioxide and chlorine in the buffer compartment adjacent to the anode compartment and persulfuric acid in the anode compartment. The persulfuric acid is hydrolyzed to produce hydrogen peroxide. Hydrogen peroxide, alkali metal hydroxide, chlorine and chlorine dioxide are useful pulp mill chemicals especially suited for pulping wood and bleaching wood pulp. - 1 -
216840
Eng Jeffrey D.
Harke Cyril J.
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