Abstract
A model with nonclassical exponents is developed for phase equilibria of a Type 2 mixture with vapor–liquid equilibrium (VLE) and liquid–liquid equilibrium (LLE). Starting with a Leung–Griffiths model for a Type 1 mixture with only VLE, the model adds a Schofield parametric construction to describe LLE and a three-phase locus. Care is taken to suppress a spurious and artificial phase boundary. The model is applied to VLE data of carbon dioxide+methane. It is conjectured that this mixture upon cooling would undergo liquid–liquid separation, but it freezes before such “virtual LLE” can be observed. Experimental bubble curves and the LLE structure from a classical equation of state are accurately modeled.
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