S. Mazrou et al., SODIUM-HYDROXIDE AND HYDROCHLORIC-ACID GENERATION FROM SODIUM-CHLORIDE AND ROCK-SALT BY ELECTRO-ELECTRODIALYSIS, Journal of Applied Electrochemistry, 27(5), 1997, pp. 558-567
An electro-electrodialysis process (EED) is used to generate HCl and N
aOH from trade NaCl. The key phenomenon limiting the current efficienc
y of this process is proton leakage through the anion selective membra
ne. Two new low proton leakage membranes: the ARA and ACM were used. N
aOH and HCl solutions with purity higher than 99.9% are obtained, The
experimental values of the fluxes for HCl and NaOH are compared with v
alues calculated from integration of the Nernst-Planck electrodiffusio
n equations. This calculation requires several experimentally determin
ed parameters: ionic diffusion coefficients, membrane conductance and
amount of sorbed electrolyte. Algerian rock salt from El Outaya is use
d to compare electro-electrodialysis and electrodialysis using bipolar
membranes.