Ion transport in a two membrane electrowinning cell for the production of hydrochloric acid |
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| Authors: | L Liao A van Sandwijk G van Weert J H W de Wit |
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| Affiliation: | (1) Faculty of Mining and Petroleum Engineering, Delft University of Technology, Mijnbouwstraat 120, 2628 RX Delft, The Netherlands;(2) Faculty of Chemical Engineering and Material Science, Delft University of Technology, Rotterdamsweg 137, 2628 AL Delft, The Netherlands |
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| Abstract: | A three-compartment electrowinning cell has been evaluated for the regeneration of HCl from metal chloride catholyte. By segregating the catholyte with an anion exchange membrane, and the anolyte with a cation exchange membrane from the middle electrolyte(ampholyte) compartment, HCl could be produced in the ampholyte electrochemically up to one molality. The anolyte consisted of sulphuric acid. Successful operation of such a double membrane cell depends on controlling ion transport through the membrane, especially chloride migration into the anolyte. Results of electrowinning and self-diffusion experiments for three types of cation exchange membrane are presented and discussed. |
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