Consistent calculation of fugacities of fluid mixtures remains as one of the most important subjects in contemporary molecular thermodynamics. In practice, equations of state (EOSs) and gE-models have been used. However, most EOSs are erroneous for condensed phases at high densities and gE-models are inapplicable for pressure-sensitive systems. Recently to remedy the shortcomings in both approaches, there has been a surge of new gE-EOS mixing rules. By equating any set of EOS and gE-models, the limitations in both approaches could be resolved significantly. However, the self-consistency in the underlying concept of those mixing rules remains controversial. During the last several years, the present authors proposed a new lattice-fluid EOS and its simplification relevant to phase equilibrium calculations. Without employing any gE-EOS mixing rule and with only two parameters for a pure component and one adjustable interaction energy parameter for a binary mixture, results obtained to date demonstrated that the EOSs are quantitatively applicable to a great variety of phase equilibrium properties of mixtures, especially, for complex and/or macromolecular systems. In the present article we summarize the EOSs and extended the applications to liquid-liquid Equilibria. In part I, we discussed briefly the molecular thermodynamic aspects of general derivation of the EOS and a brief discussion of applying the EOSs to pure fluids while the illustrative application to various real mixture systems is discussed in part II.
Shin MS, You SS, Lee CS, Gmehling J, Yoo KP, "A New Simplified Lattice Equation of State for Phase Equilibria of Complex Mixtures," Proc. 2nd Beijing Int. Symp. on Thermo. in Chem. Eng. and Ind., Vol. 1, 650, May 24-27, 1994
Shin MS, Yoo KP, Kim HY, Lee CS, "Supercritical Fluid-Phase Equilibria of Complex Systems Using a New Equation of State Based on the Nonrandom Lattice Hole Theory," Proc. 3rd Int. Symp. on Supercritical Fluids, Vol. 1, 137, Strassbourg, France, Oct. 17, 1994
Shin MS, You SS, Yoo KP, Lee CS, Int. J. Thermophys., 16(3), 723, 1995
Shin MS, Yoo SJ, You SS, Yoo KP, Lee CS, Fluid Phase Equilib., in press, 1995
Yoo KP, You SS, Lee CS, "A New Approximate Nonrandom Lattice Fluid Model for Fluid Phase Equilibria of Polymer Solutions," Proc. 2nd Beijing Int. Symp. on Thermo. in Chem. Eng. and Ind., Vol. 1, 651, May 24-27, 1994
Van Krevelen DW, "Properties of Polymers, Their Correlation with Chemical Structure; Their Numerical Estimations and Prediction from Additive Group Contributions," 3rd ed., Elsevier Sci. Pub. Co., Amsterdam Netherlands, 1990