Transport of formic acid through anion exchange membranes by diffusion dialysis and electro-electro dialysis

In this study, first, the diffusion dialysis method was used for the transport of formic acid through anion exchange membranes (polysulfone SB-6407, Neosepta AFN, ACM, and AMH). The transport of formic acid was carried Out at different concentration ranges and quantified with the membrane mass-transfer coefficient and diffusion coefficient parameters. Neosepta AFN and SB-6407 membranes were efficient for formic acid transport by the diffusion dialysis method at low concentrations. The second method, electro-electro dialysis was applied as a function of some parameters, Such as concentration ratio and polarization curves at constant flow rate (1.17 x 10(-6) m(3) s(-1)), and at 0.1-M concentration of formic acid. In this method, AMH membrane was found to be effective due to its higher mechanical stability, lower proton leakage, lower water content and higher current efficiency.