The simultaneous representation of dielectric constant, volume and activity coefficients using an electrolyte equation of state - Unité de Chimie et Procédés (UCP) Accéder directement au contenu
Article Dans Une Revue Fluid Phase Equilibria Année : 2008

The simultaneous representation of dielectric constant, volume and activity coefficients using an electrolyte equation of state

Résumé

In this work, we propose an extension to electrolyte systems of the Cubic Plus Association (CPA) equation of state. The effect of the ionic charge is accounted for by a Born term, and a Mean Spherical Approximation (MSA) contribution for the coulombic interactions between permanent charges. The effect of the Born term on the excess properties is directly related to the change of the dielectric constant with concentration. This paper analyses the capacity of the model to represent the properties of aqueous solutions by comparison with experimental data of apparent molar volume and activity coefficients. In a first stage, we discuss the contribution of each term based on the water-NaCl and water-CaCl(2) systems. Simonin's model for the dielectric constant is found most convenient for describing the dielectric constant. In a second stage, the model is extended with success to a set of ten different salts in water.

Dates et versions

hal-01212204 , version 1 (06-10-2015)

Identifiants

Citer

Radia Inchekel, Jean-Charles de Hemptinne, Walter Fürst. The simultaneous representation of dielectric constant, volume and activity coefficients using an electrolyte equation of state. Fluid Phase Equilibria, 2008, 271 (1-2), ⟨10.1016/j.fluid.2008.06.013⟩. ⟨hal-01212204⟩
95 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More