Abstract
Electrical conductivity, water transport number and hydraulic permeability of a weak functional group ion exchanger are computed when the co-ion concentration is zero for the homogeneous and the heterogeneous frictional models and for Stefan-Maxwell's diffusion model. These three transport characteristics of a weak-acid carboxylate membrane are measured at various neutralization rates, in a support electrolyte at low concentration. Symmetrical friction coefficients and mutual diffusion coefficients are computed from water transport number at total ionization and by multiple regression analysis of electrical conductivity data at various degrees of neutralization. Comparison of computed and experimental hydraulic permeabilities shows that the Stefan-Maxwell diffusion model and the heterogeneous frictional model are more appropriate than Spiegler's frictional model to predict mass-transport through the tested weak-acid membrane.
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