Processes and installations for the regeneration of spent...

Details Processes and installations for the regeneration of spent... Processes and installations for the regeneration of spent...

C - Chemistry, Metallurgy

23

G

204/170, 204/98.

C23G 1/36 (2006.01) C25C 1/06 (2006.01) C25F 7/02 (2006.01)

Patent

CA 1044641

ABSTRACT OF THE DISCLOSURE Regeneration of spent hydrochloric acid after use for pickling iron, which therefore contains iron chlo- rides, by electrolysis in the cathodic and intermediate compartments of an electrodialysis cell. The installation includes electric circuitry for connecting up the anode as well as input conduits for the spent acid but other- wise consists essentially of an electrodialysis cel? with an uneven number of compartments wherein each cathodic compartment is separated from the adjacent intermediate compartment by an anion-selective membrane while a cation- selective membrane separates each intermediate compartment from the anodic compartment, the latter being filled with an anolyte whose total Faraday yield for water oxidation is close to 1. Electrolysis is conducted with current densities at the cathode of 0.1 - 20 A/dm2, at the anode corresponding to the water oxidation reaction and at the membranes such that their perm-selectivity is close to 1. The ionic strengths in equivalents of the regenerated solution and of the untreated spent acid are the same.

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