A mechanism of separation of strong electrolytes by ion-exchangers, based on electro-kinetic exclusion of co-ions

Anatoly M. Dolgonosov

Anatoly M. Dolgonosov Dr.Sci.(Chem.), leading scientific fellow, Lab of Sorption Methods, GEOKHI RAS; e-mail: amdolgo@mail.ru

Keywords: acid retardation, exclusion of co-ions, Donnann effect, multi-species ion exchange kinetics.

Abstract

An approach, describing the phenomenon of co-ions exclusion under violation of Donnann
barrier in the ion-exchanger, is developed. This description is based on the difference between the
composition of initial solution and electro-kinetic fluxes. The equations for equilibrium and kinetics of
non-exchange process are deduced. It is shown that a certain transformation of counter-ions
characteristics gives a way to describe the mass-transfer process with the use of the theory of the
multicomponent ion exchange, i.e. the mass-transfer in non-exchanging process can be presented as
equivalent to mass-transfer in ion-exchanging process. The quantitative parameters of the phenomenon
depend on the characteristics of electrolyte, ion-exchanger and dynamic mode of contact of phases.

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