Vapor-liquid equilibria for the binary system 2,2−dimethylbutane + 1,1−dimethylpropyl methyl ether (TAME) at 298.15, 318.15, and 338.15 K

Abstract Vapor–liquid equilibrium (VLE) data are reported for the binary mixtures formed by 2,2-dimethylbutane and the branched ether 1,1-dimethylpropyl methyl ether ( tert -amyl methyl ether or TAME). A Gibbs-van Ness type apparatus was used to obtain total vapor pressure measurements as a function of composition at 298.15, 318.15, and 338.15 K. Deviations from Raoult’s law are positive and very small. These VLE data are analyzed together with excess enthalpy ( H m E ) data previously reported at 298.15 K using the UNIQUAC model. The modified UNIFAC (Dortmund) model is used to predict VLE data.