The modified three-characteristic-parameter correlation model for nonaqueous electrolyte solutions

摘要

In this study the modified three-characteristic-parameter correlation model is applied for the description of osmotic coefficient of LiBr in methanol, ethanol, 2-propanol and acetonitrile at 298.15 K. The model combines the Pitzer-Debye-Huckel description of electrostatic contribution with an empirical description of the solvation contribution. The model includes four parameters: the ionic contacts distance rho the dielectric constant of solution D-e, the solvation parameters S and n. Two of them, n and rho are fixed. The other two, D-e and S, are considered as adjustable parameters. Comparisons were made with isopiestic experimental data and to the models of Chen and Evans (C.C Chen, L.B.A Evans, AIChE J. 32 (1986) 444.) and Haghtalab-Vera (A. Haghtalab, J.H. J.H. Vera, AIChe J. 34 (1985) 803.) (C) 2004 Elsevier B.V. All rights reserved.