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Unified equation of state based on the lattice fluid theory for phase equilibria of complex mixtures part II. Application to complex mixtures

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Abstract

In part I of the present article [Yoo et al., 1995], new rigorous and simplified lattice-fluid equations of state (EOS) were derived and their characteristic features of the molecular thermodynamic foundation were discussed by applying to pure fluids. In this part II, both EOSs were extended to various phase equilibrium properties of mixtures. Comparison of the models with experimental mixture data ranges from density, to equilibria of vaporliquid, vapor-solid and liquid-liquid phases for nonpolar/nonpolar, nonpolar/polar, polar/polar mixtures. Both models were also applied to supercritical fluid phase equilibria and activities of solvents in polymer solutions. With two temperature dependent parameters for pure compounds and one temperature-independent binary interaction energy parameter for a binary mixtures, results obtained to date illustrated that both EOSs are quantitatively applicable to versatile phase equilibria of mixtures over a wide range of temperatures, pressures and compositions.

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Authors and Affiliations

  1. Department of Chemical Engineering, Korea University, 136-701, Seoul, Korea

    Chul Soo Lee

  2. Department of Chemical Engineering, Sogang University, C.P.O. Box 1142, Seoul, Korea

    Ki-Pung Yoo

  3. Department of Chemical Engineering, Seoul National University, 151-742, Seoul, Korea

    Hwayong Kim

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  1. Ki-Pung Yoo
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  2. Hwayong Kim
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  3. Chul Soo Lee
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Yoo, KP., Kim, H. & Lee, C.S. Unified equation of state based on the lattice fluid theory for phase equilibria of complex mixtures part II. Application to complex mixtures. Korean J. Chem. Eng. 12, 289–299 (1995). https://doi.org/10.1007/BF02705759

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  • DOI: https://doi.org/10.1007/BF02705759

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