Electrochemical process for producing hydrosulfite solutions

Details Electrochemical process for producing hydrosulfite solutions Electrochemical process for producing hydrosulfite solutions

C - Chemistry, Metallurgy

25

B

23/105, 204/61

C25B 1/14 (2006.01)

Patent

CA 1332371

ABSTRACT A process for the electrochemical production of an alkali metal hydrosulfite by the reduction of an alkali metal bisulfite component of a circulated aqueous catholyte solution in an electrolytic membrane cell having a cathode compartment, a porous cathode in the cathode compartment, an anode compartment and a cation exchange membrane separating the cathode compartment from the anode compartment, which comprises passing at least 30 percent by volume of the aqueous catholyte through the pores of the porous cathode in the cathode compartment. High purity solutions of alkali metal hydrosulfites, such as sodium hydrosulfite having con- centrations of at least 120 grams per liter, are pro- duced at current densities in the range of 1.0 to 4.5 KA/m2 and at reduced cell voltages. The thiosulfate impurity concentration is from 0 to about 10 percent by weight of the hydrosulfite.

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