Model of non-equilibrium thermodynamics of competitive diffusive transport in ion-exchangers

Abstract

The process of ion transport inside ion-exchanger is carried out at least two parallel act in force
mechanisms, including "free diffusion" of ions and their migration to unionized functional groups ("non-free
diffusion") has been analysed. It is shown, that under conditions of noncomplete dissociation, description of
internal diffusion ion-fluxes at binary exchange is reduced to a diffusion Fick's law, with one common ratio
of reciprocal diffusion, depending on the degree of dissociation and ion composition of each local volume of
the resin, accoding to individual stability constants of ion-pairs formed with a fixed groups and ion-mobilities
in each of the transfer mechanisms