Phase equilibria for chain-fluid mixtures near to and far from the critical region

Authors

  • Jianwen Jiang,

    1. Dept. of Chemical Engineering, University of California, Berkeley, CA 94720 and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
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  • John M. Prausnitz

    Corresponding author
    1. Dept. of Chemical Engineering, University of California, Berkeley, CA 94720 and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
    • Dept. of Chemical Engineering, University of California, Berkeley, CA 94720 and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
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Abstract

A recently established crossover equation of state for pure chain fluids is extended to chain-fluid mixtures. Far from the critical region, where density fluctuations are small, it reduces to the classic equation of state. Near or at the critical point, the crossover equation of state incorporates contributions form long-wavelength density fluctuations. Using segment–segment parameters for pure components and one cross parameter k12 for every binary pair as obtained from vapor–liquid equilibrium data remote from the critical region, this crossover equation of state gives vapor–liquid equilibria in good agreement with experiment for binary asymmetric mixtures of n-alkanes far from, near to, and at the critical point.

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