Vapor-liquid equilibrium of the methanol-tert-butyl methyl ether (MTBE) system

Vapor-liquid equilibrium data for the methanol-tert-butyl methyl ether (MTBE) system have been measured covering the whole concentration range at six temperatures between 298.15 and 338.15 K. A Gibbs-Van Ness type apparatus for total vapor-pressure measurements of binary mixtures has been used. Data reduction has been carried out by means of a modified Barker's method using a Pade approximant to describe the excess Gibbs energy. The methanol-MTBE mixtures show positive deviations from ideality. The calculated values for the excess Gibbs energy are moderately positive and only slightly temperature dependent. Excess enthalpy values calculated from the temperature dependence of the excess Gibbs energy are in agreement with experimental data found in the literature. The experimental data are analyzed in terms of the UNIQUAC model, several versions of the UNIFAC model, the Lattice-Fluid model and the Lattice-Fluid Associated Solution Model.