C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/156, 204/62.
C25B 1/26 (2006.01) C25B 1/46 (2006.01)
Patent
CA 1073845
Abstract of the Disclosure Chlorates such as alkali metal chlorates, are made by electrolyzing brine in a cell having a plurality of compartments or zones therein, preferably three, wherein anode and cathode compartments are separated by a buffer compartment formed by perm- selective membranes of hydrolyzed copolymer of tetrafluoroethylene and a fluorosulfonated perfluorovinyl ether, or a sulfostyrenated perfluorinated ethylene propylene polymer, or by such a perm- selective membrane on the cathode side plus a porous diaphragm on the anode side, while reacting chlorine gas with the buffer zone contents in the zone or removed form it to a separate reactor vessel, while being under such conditions as to produce hydrochlorite and/or chlorate and chloride therein, converting any hypochlorite to chlorate and chloride in a liquid medium into the buffer compartment and a portion to the anode compartment and electrolyzing the chloride thereof. By such a process, with continued recirculation of the product solution until the chlorate content is sufficiently high, a relatively concentrated chlorate solution can be produced con- taining proportionally less chloride, due to its conversion to chlorate, and obviating the need for additional processing to remove chloride before chlorate could be obtained low in chloride and at an acceptable concentration.
212573
Cook Edward H. (jr.)
Emery Alvin T.
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