Abstract
An electro-electrodialysis process (EED) is used to generate HCl and NaOH from trade NaCl. The key phenomenon limiting the current efficiency of this process is proton leakage through the anion selective membrane. Two new low proton leakage membranes: the ARA and ACM were used. NaOH and HCl solutions with purity higher than 99.9% are obtained. The experimental values of the fluxes for HCl and NaOH are compared with values calculated from integration of the Nernst–Planck electrodiffusion equations. This calculation requires several experimentally determined parameters: ionic diffusion coefficients, membrane conductance and amount of sorbed electrolyte. Algerian rock salt from El Outaya is used to compare electro-electrodialysis and electrodialysis using bipolar membranes.
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MAZROU , S., KERDJOUDJ , H., CHE´RIF , A.T. et al. Sodium hydroxide and hydrochloric acid generation from sodium chloride and rock salt by electro-electrodialysis. Journal of Applied Electrochemistry 27, 558–567 (1997). https://doi.org/10.1023/A:1018498612326
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DOI: https://doi.org/10.1023/A:1018498612326