Chloride-sulphate exchange on anion resins,kinetic investigations. VI. Differential exchange rates in diluted systems

The kinetics of the SO₄ uptake by 6 × 10^-3N Na₂SO₄ solution of some typical anion resins in Cl form have been followed differentially, i.e. with complete conversion progressively occurring in about five steps. Like for the integral exchange the kinetics for the differential conversions agree with a rate equation previously developed for systems with reactions accompanying exchange. The accordingly determined differential rate parameters increase regularly with the conversion degree, and the integral value seems to be determined by the final rate. The sulfate selectivity also arises during the conversion, while no appreciable differences in water fluxes have been associated with ionic modification of the resins.