Electrolyte-UNIQUAC-NRFModel for prediction of osmotic coefficient and vapor pressure of single electrolyte solutions at high temperatures

The Electrolyte-UNIQUAC-NRF model proposed by Haghtalab and Peyvandi, Fluid Phase Equilib., 281, 2009 is modified and applied to prediction of the osmotic coefficient and vapor pressure of single electrolyte solutions. Using the experimental mean activity coefficient of aqueous binary electrolyte systems in the extensive domain of temperature and molality, the adjustable temperature dependent parameters are obtained for several binary electrolyte systems. Then the osmotic coefficient and vapor pressure of some binary systems are predicted at a wide range of temperature and molality using the adjustable binary parameters. As a conclusion, the modified Electrolyte-UNIQUAC-NRF model can predict the osmotic coefficient and vapor pressure at high temperature precisely.

Keywords:

Electrolyte-UNIQUAC-NRF model , Activity Coefficient , Osmotic Coefficient , Vapor Pressure , High temperature