Abstract
Equations for ion exchange selectivity and resinate activity coefficients computed as a function of the ionic composition of resins have been derived. They are based on the assumption that the real non-ideal ion exchange process is a superposition of three ideal elementary processes related to the different types of exchange sites in resins. In the simplest non-ideal exchanger case, the equations derived for the computation of resinate activity coefficients are comparable to Kielland's equation. The equations have been tested with nine ion exchange systems exhibiting strong deviations from ideal behaviour (exchange of alkali metal ions for H + on highly crosslinked sulphonic resins). Correlation between the theory and experiment is good.
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