RESIN PHASE MASS TRANSFER IN ION EXCHANGE BETWEEN DIFFERENT IONS ACCOMPANIED BY RESIN VOLUME CHANGE

Abstract

Ion exchange between different ions in resin phase was analyzed by applying a model in which the changes of resin diameter and ion diffusivity with the progress of ion exchange were considered simultaneously in addition to the effect of an electric field. Numerical results were applied to systems which exhibit larger and smaller volume changes, respectively. The present model may be used for the case when a large resin volume change occurs, while the simple Nernst-Planck model is applicable to the case of a small-volume change system.