C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/156, 204/57
C25B 1/00 (2006.01) C25B 1/14 (2006.01) C25B 1/46 (2006.01) C25B 9/00 (2006.01)
Patent
CA 1058555
ABSTRACT OF THE DISCLOSURE Dithionites are made by a process which begins with the production of high concentration chloride-free sodium hydroxide solution and chlorine at a high current efficiency from a three- compartment electrolytic cell having membranes of a cation- active permselective membrane material separating anode and cathode compartments from a buffer compartment. Hydroxide ions migrating into the buffer compartment from the cathode compartment are converted to sulfite by reaction with sulfur dioxide, improving the current efficiency of the three-compartment cell, and the sulfite is removed. Subsequently, the sulfite resulting and additional sulfur dioxide are fed to the cathode compartment of a two-compartment electrolytic cell wherein the anode and cathode compartments are separated by a cation-active perm- selective membrane and in which chloride solution is being electrolyzed to chlorine and caustic. The caustic reacts with the sulfite and sulfur dioxide in the cathode compartment to produce sulfite and dithionite. - 1 -
212484
Eng Jeffrey D.
Harke Cyril J.
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