Isobaric (Vapor + Liquid) Equilibria for Methylcyclohexane with Para-, Ortho-, and Meta-Xylenes and Ethylbenzene at 101.33 kPa

A series of isobaric vapor–liquid equilibrium experiments were conducted on binary mixtures of methylcyclohexane with para-, ortho-, and meta-xylenes and ethylbenzene, at a pressure of 101.33 kPa, using an Othmer still equipment setup. The resulting composition of vapor and liquid phases was determined by gas chromatography, while the thermodynamic consistency of measured results was checked using the van Ness and Wisniak L–W methods. The measured equilibrium data were fitted with activity coefficient models of the nonrandom two-liquid, the Wilson, and the extended universal quasichemical, and the binary interaction parameters of these models were obtained. The vapor–liquid equilibrium diagrams were predicted by the fitted models, which matched well with experimental data.