(191t) Wong-Sandler Mixing Rules: Their Versatility Beyond Phase Equilibrium Calculations

Without a doubt one of the major breakthroughs in modern phase equilibrium calculations relies on the idea devised by Wong and Sandler (1992) in cunningly combining an equation of state (EoS) with excess free energy models yielding theoretically-correct mixing rules for improved phase behavior representations. The Wong-Sandler approach not only produces the desired EoS behavior at both low and high densities without being density dependent, but it also allows safe extrapolations over wide ranges of temperature and pressure. Much has been written and discussed about the suitability of the use of the Wong-Sandler mixing rules in a wide variety of phase equilibrium calculations. In this presentation, I will talk about the versatility of the Wong-Sandler approach when applied to modeling other properties beyond conventional phase behavior calculations. Accordingly, the performance of the Wong-Sandler mixing rules will be discussed during the calculation of (1) thermodynamic properties of electrolyte solutions and highly asymmetric mixtures and, (2) dynamic viscosities of non-ideal solutions (aqueous & non-aqueous) and polymer-solvent mixtures.

Wong, D.S.H, and Sandler, S.I., A Theoretically Correct Mixing Rule for Cubic Equations of State, AIChE J., 38, 671 (1992).