Recovery of acids from salt forms of sodium using cation-exchange membranes

The recovery of acids from the solutions containing metallic salts (NaNO3, NaCl, Na2SO4 ) was achieved by the electrohydrolysis (EHD) method using cation-exchange membranes (CEM). In the experiments, base solutions were used as a catholyte and different salts of sodium were used as an anolyte. The effects of flow rate, current density, initial concentrations of salt and base solutions, the type of salt solution and the type of the cation-exchange membrane on the recovery ratio of acids were investigated. The results obtained show that electrodialysis seems to be an applicable method for the recovery of acids at suitable conditions.