Abstract
Isobaric vapor-liquid equilibria (VLE) near atmospheric pressure of several hydrocarbon binary systems were predicted by using the regular solution model, which included the mixing entropy term and the unlike molecule interaction parameter. Solubility parameters and molar volumes at each temperature required in the calculation are estimated by previously proposed methods. Isobaric VLE of hexane + heptane and heptane + octane systems were well predicted without introducing interaction parameter. On the other hand, for straight-chain hydrocarbon + cyclic hydrocarbon and cyclic hydrocarbon + cyclic hydrocarbon systems, the interaction parameter was needed to calculate VLE. Isobaric VLE of hydrocarbon systems may be predicted by the regular solution model. Previously proposed methods are found to be successful in estimating the solubility parameter and molar volume at a given temperature.
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