Abstract
In order to generate H 2SO 4 and NaOH from Na 2SO 4 solutions, the electro-electrodialysis (EED) and the electrodialysis (ED) on bipolar membrane (BPM) are compared. For both these processes, the electroosmosis associated to the transport of the sodium ions through the cation exchange membrane (CEM) limits the soda concentration. Due to the co-ion leakages through the BPM which increase with the concentrations of the acid and the base on both sides of this membrane, the current efficiencies of both the acid and the base production are higher for the EED than for the ED on BPM. However, the investment cost for EED is higher than for ED due to the need for a couple of metallic electrodes per each elementary cell.
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