Method of reducing chlorate formation in a chlor-alkali...

C - Chemistry – Metallurgy – 25 – B

Patent

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Details

CPC

204/64.2

IPC codes

C25B 1/46 (2006.01)

Type

Patent

Patent number

CA 1117895

Description

ABSTRACT OF THE DISCLOSURE: In a process wherein an aqueous alkali metal chloride solution is electrolyzed in an electrolytic cell having an anode compartment containing an anode and anolyte and a cathode compartment containing a cathode and cath- olyte and a substantially fluid impervious selectively per- meable barrier separating the anode and cathode compartments and wherein the alkali metal chloride solution is contin- uously circulated through the anode compartment, the im- provement comprising reducing chlorate formation in the anolyte by introducing an alkali metal chloride solution into the anode compartment and operating the cell at an alkali metal chloride conversion factor of between 40% and 80% and adding water or removing alkali metal hydroxide from the cathode compartment so as to maintain an alkali metal hydroxide concentration of about 15 percent to about 20 percent by weight.

Application Number

293079

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