Abstract
A re-evaluation is reported of earlier calculations for vapor–liquid equilibria [R. J. Sadus, J. Chem. Phys. 115, 1460(E) (2001); 116, 5913 (2202)] using the Dieterici–Carnahan–Starling (DCS) equation of state. The results for liquid-phase densities and properties near the critical point are generally consistent with the original work. However, the recalculated vapor-phase densities and coexistence pressures are shifted to substantially higher values. The implications for real fluids are that the DCS equation is likely to yield accurate predictions of both near-critical equilibria and the temperature-density behavior of the liquid phase at the expense of poor agreement with experiment for both vapor densities and pressures.
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