Method for the electrolysis of aqueous solutions of hydrochloric acid
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United States of America Patent
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Jun 23, 1998
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Dec 18, 1996
filing date -
Jan 19, 1996
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Abstract
The improved method for the production of chlorine from aqueous solutions of hydrochloric acid in a membrane electrolysis cell comprises a cathode compartment equipped with a gas diffusion cathode fed with air or enriched air or oxygen and an anodic compartment with an anode provided with an electrocatalytic coating for chlorine evolution. Said anode compartment is fed with an aqueous solution of hydrochloric acid having a maximum concentration of 20% and a maximum temperature of 60.degree. C., and containing an oxidizing compound having a redox potential of at least 0 Volts NHE and preferably 0.3-0.6 Volts NHE. A suitable oxidizing compound is trivalent iron in concentrations comprised in the range of 100-10,000 ppm. Both the anodic and cathodic compartment of the cell and their internal structures are made of titanium or alloys thereof, such as 0.2%. titanium-palladium. The parts made of titanium in which crevices may be present are provided with a protective coating based on metals of the platinum group, their oxides as such or as a mixture of the same.
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