TRANSPORT-PROPERTIES OF PERFLUORINATED CATION-EXCHANGE MEMBRANES IN AQUEOUS AND METHANOL SOLUTIONS OF NACL

The properties of perfluorinated membranes (Nafion(R)) with sulfonic a nd carboxylic groups in aqueous and methanol solutions of NaCl at room temperature is compared. The transport properties examined are: the a pparent transport number of Na+, conductivity, permeability of electro lyte and the solvent. It is found that the decrease of separating abil ity of membranes in methanol solutions is caused mainly by the increas e of solvent and salt permeability. The transport numbers of Na+ count erions in both solvents are comparable. The highest increase of permea tion rates of salt and solvent is observed for the carboxylate membran e.