Transport of co-ions across ion exchange membranes in electrodialytic metathesis MgSO4 + 2KCl → K2SO4 + MgCl2

2 Flow rates of co-ions across membranes (Cl! and SO4 ! ions across Neosepta CMX cation exchange membranes, 2+ K and Mg ions across Neosepta AMX anion exchange membranes) in the title electrodialytic metathesis have been determined. It was established that the flow of co-ions causes contamination of all solutions flowing through the electrodialyzer. For instance, Cl! ions penetrate into anolyte (K2SO4 solution), chlorine is found among anode reaction products and deteriorates operating conditions and induces corrosive processes. A quantitative contamination assessment of two products (potassium sulphate and sodium chloride) was carried out. +