Kinetics of Neutralization of Weak Electrolyte Ion-Exchange Resins

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Abstract
The adsorption of acids and alkalis by weak electrolyte resins is described by diffusion of the ions through the resin bead, with an accompanying neutralization reaction. A model proposed by Helfferich has been extended to account for the situation where the solution concentration of the reagent is changing during the rate experiment. Two mechanisms are necessary, depending on the concentration of the reagent. The rate expression for systems where the reagent concentration is greater than 0.01 M is given. It predicts that the adsorption rate is dependent on the solution hydrogen ion concentration in the case of weakly basic resins, and that it varies inversely with the square of the particle radius. The rate should also be unchanged by the resin of added salt. Experimental evidence in the form of rate data for the uptake of hydrochloric acid by a commercial weakly basic resin support the derived equation, which can be modified further to account for the diffusional resistance of the liquid film around the resin particle.

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