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Article
Multicomponent diffusion in concentrated electrolyte solutions : effect of solvation.
AIChE J (1987)
  • Neville G. Pinto, University of Louisville
  • E. E. Graham
Abstract
A method is presented to estimate the diffusivities of electrolytes in concentrated multicomponent systems. The method is based on the Stefan-Maxwell flux equations. Explicit expressions have been developed for the phenomenological transport coefficients. These expressions incorporate the effects of solvation, viscosity, and ionic interactions. It has been shown that multicomponent diffusion behavior can be related to corresponding single-electrolyte and tracer diffusion cases. Thus, solvation effects are estimated from single-electrolyte data, and ion-ion interaction effects are obtained from tracer diffusion studies. The method has been tested for the ternary system NaCl-KCl, at concentrations of up to 3.0 M, and for corresponding single-electrolyte and tracer diffusion cases at concentrations of up to 4.0 M. In general, the method predicts phenomenological coefficient values within 1.5% of the experimental values for univalent systems.
Publication Date
April, 1987
DOI
10.1002/aic.690330309
Citation Information
Neville G. Pinto and E. E. Graham. "Multicomponent diffusion in concentrated electrolyte solutions : effect of solvation." AIChE J Vol. 33 Iss. 3 (1987) p. 436 - 443
Available at: http://works.bepress.com/neville-pinto/4/