Abstract
Comparison of the representations of vapour—liquid equilibrium data for hydrogen—hydrocarbon mixtures is presented from the perturbed hard chain equation of Gmehling et al. (1979, Chem. Engng Sci. 34, 951), using different mixing rules and the Soave (1972, Chem. Engng Sci. 27, 1197) equation of state and three of its modifications especially developed for hydrogen—hydrocarbon mixtures (Graboski and Daubert, 1979, Ind. Engng Chem. Proc. Des. Dev. 27, 1197; El Twaty and Prausnitz, 1980, Chem. Engng Sci. 35, 1565; Mathias, 1983, Ind. Engng Chem. Proc. Des. Dev. 22, 385). If all the equations are used without a binary interaction parameter, or if they are used with one temperature-independent interaction parameter, the Gmehling et al. equation of state is found to be the most accurate for vapour—liquid equilibrium representation. Furthermore, the Gmehling equation appears to be the best to represent liquid molar volumes, but cubic equations are slightly better for representing vapour molar volumes.
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