A New Surface Tension Model for Prediction of Interaction Energy between Components and Activity Coefficients in Binary Systems

In this work, we develop a correlative model based on the surface tension data in order to calculate thermodynamic parameters, such as interaction energy between components (Uij), activity coefficients, etc. In this new approach, using Li et al. (LWW) model, a threeparameter surface tension equation is derived for liquid mixtures. The surface tension data of 54 aqueous and 73 non-aqueous binary mixtures are correlated as a function of composition using the new model, then the interaction energy between two compounds (Uij) of mixtures and their activity coefficients are calculated with the results of this model. The average relative error obtained from the comparison of experimental and calculated surface tension values for 127 binary systems is less than 2.8%. The obtained values using this method are comparable with those of the UNIFAC group contribution model.