IRREVERSIBLE THERMODYNAMICS OF TRANSPORT ACROSS CHARGED MEMBRANES .6.FRICTIONAL INTERACTIONS AND COUPLING EFFECTS IN TRANSPORT OF ACID THROUGH ANION-EXCHANGE MEMBRANES

Having performed experiments described in [1-3] the friction coefficie nts, f(ik), coupling coefficients, q(ik), and diffusion indexes for io ns and water, ($) over bar D-i, have been computed in order to discuss the interactions on transport of acid (HCl) through anion exchange me mbranes. Two membranes were examined - diffusion dialysis Neosepta AFN -7 and standard grade Neosepta AM-1 (Tokuyama Corp.). The frictional i nteractions and coupling effects in AFN-7 membrane, the dual mode sorp tion, high diffusion coefficient, ($) over bar D-HCl and negative refl ection coefficient, sigma, can be explained postulating the dual mecha nism of transport: a simple diffusion of acid dissolved in internal wa ter combined with a kind of facilitated transport of the ''absorbed'' acid.