Mass transfer with liquid anion exchange

Abstract

To study the mass transfer mechanism by a liquid anion exchanger, rates of extraction of hydrochloric acid were measured using a stirring cell with a flat liquid—liquid interface and the mass transfer model in the cell was examined. Applying the mass transfer model determined from the results of the extraction of hydrochloric acid to ion exchange, theoretical equations for the exchange rate, were derived by applying the Nernst—Planck model for diffusion of an ion in aqueous phase, and rates of ion exchange were measured. It was found that over a wide region of contact times the rate of ion exchange could be expressed quantitatively by means of theoretical equations that take the electric field into account when the diffusivities of the counter ions are not equal.