Vapor−Liquid Equilibria and Excess Properties of Cyclohexane−1,1-Dimethylpropyl Methyl Ether (TAME) Mixtures

Abstract

Vapor−liquid equilibrium (VLE) data are reported for the binary mixtures formed by cyclohexane 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 for cyclohexane−TAME mixtures as a function of composition at 298.15, 308.15, 318.15, and 328.15 K. These data are analyzed together with isothermal VLE data previously obtained at 313.15 K and excess enthalpies and volumes previously determined at 298.15 K for these mixtures. The Peng−Robinson equation of state and the Wong−Sandler mixing rule, the lattice-fluid (LF) model, the Flory theory, the UNIQUAC model, and the modified UNIFAC (Dortmund) model are used to correlate or predict the VLE data and excess properties of cyclohexane−TAME mixtures.