Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Surface tensions for aqueous electrolyte solutions containing NaCl, NaBr, NaI, KCl, KBr, KI have been measured at different temperatures and different concentrations. The liquid densities and activity coefficients of electrolyte solutions are modeled accurately with Ion-based Statistical Associating Fluid Theory (SAFT2). Besides, a new surface tension prediction model based on Gibbs thermodynamic method, coupled with Ion-based SAFT2 is established, which is applied to predict the surface tension of aqueous concentrated electrolyte solutions at different temperatures and different concentrations. In this model, the relation between the surface tensions and activity coefficients of aqueous electrolyte solutions calculated by Ion-based SAFT2 is derived, and the surface tensions of aqueous electrolyte solutions are correlated with only one parameter and overall average deviation is 0.54%. The model is found to give accurate prediction for the surface tension of aqueous concentrated electrolyte solutions at different temperatures and different concentrations with the parameters obtained at one fixed temperature.