Vapour-liquid equilibria for the binary system cyclohexane-1,1-dimethylethyl methyl ether (MTBE) at 298.15, 308.15 and 318.15 K

Vapour-liquid equilibrium data are reported for the binary mixtures formed by cyclohexane and the branched ether 1,1-dimethylethyl methyl ether (tert-butyl methyl ether or MTBE). A Gibbs-Van Ness type apparatus was used to obtain total vapour pressure measurements for cyclohexane-MTBE mixtures at 298.15, 308.15 and 318.15 K. The system exhibits very small deviations from Raoult's law with a nearly ideal behaviour. No temperature effect on vapour compositions is observed. Results are analysed in terms of the Peng-Robinson equation of state and the Wong-Sandler mixing rule, the lattice-fluid model, the UNIQUAC model, and the UNIFAC and modified UNIFAC models.