Kinetics of ion-exchange processes accompanied by chemical reactions

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Abstract

Kinetic measurements were made of three ion-exchange processes—protonation of a carboxylic ion-exchanger, exchange of an anionic complex ion on a strong-base anion-exchanger, and chelation of a metal ion on a chelating ion-exchanger—which are accompanied by fast chemical reactions and are characterized by a sharp moving boundary between the reacted shell and the shrinking unreacted core within each ion-exchanger bead. Analyses of the respective rate data in accordance with a theoretical model showed that all three processes are controlled by the rate of diffusion of the ions penetrating the reacted layer. Diffusion coefficients were determined from the graphical representation of the proposed model.

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