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Computation of diffusion coefficient dependence upon concentration from sorption experiments

A. Brunovská, J. Ilavský, and J. Valtýni

Department of Chemical Engineering, Slovak Technical University, 880 37 Bratislava


Abstract:  The direct evaluation of the internal diffusion coefficient from experimental adsorption kinetic curve is possible, only when this coefficient is constant. In such a case, the known analytical solution of the 2nd Fick's law may be used. However, this assumption is not mostly satisfied. Then the concentration dependence of diffusion coefficients is to be evaluated. So far, only graphical methods for a plane sheet have been published. In this paper a computer-suitable iteration method for deducing con- centration dependence of diffusion coefficient from the sorption data is described. The idea is based on the Crank's method for progressing sorption experiments.

Full paper in Portable Document Format: 293a290.pdf


Chemical Papers 29 (3) 290–295 (1975)

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