Document Type : Regular Article
aChemical Engineering Department, Islamic Azad University, Shahrood Branch, Iran
Chemical Engineering Department, Amirkabir University of Technology, (Tehran Polytechnic), Tehran, Iran
Chemical Engineering Department, Amirkabir University of Technology, Tehran, Iran
cRefining Technology Development Division, Research Institute of Petroleum Industry, National Iranian Oil Company, Tehran, Iran
In this work, an electrolyte-UNIQUAC model was developed by replacement of Boltzmann weight binary interaction parameters by the nonextensive Tsallis weight. A summation of the long-range electrostatic term (Debye-Huckel equation) and a short-range interaction term were considered in the calculation of thermodynamic properties. A framework proposed by Chen and co-workers was employed for the derivation of the local mole fractions. Application of the nonextensive theory increased the degree of freedom of the present model (T-E-UNIQUAC). Furthermore, the strength of the model lies in its ability to calculate individual activity coefficients of ions. The applicability of the T-E-UNIQUAC model has been tested using aqueous electrolyte solutions and results have been compared with Messnaoui, Chen and Pitzer models.