Isobaric vapor-liquid equilibrium (VLE) data (T-x-y) for the binary systems methanol/2-methoxy-2methylbutane (TAME), methanol/2-methyl-2-butene, and methanol/2-methylbutane were obtained at 101.3 kPa. All systems showed a positive deviation from ideality with a minimum-boiling-point azeotrope. The activity coefficients were calculated with the use of the Wilson equation where the parameters of the binary systems were determined on the basis of the experimental data. Other VLE data relevant to TAME synthesis were collected from the literature, and the respective parameters were adjusted. Earlier reported results of the reaction equilibrium experiments on the liquid-phase formation of TAME were reanalyzed. On the basis of the experimental reaction equilibrium, a value of -109.6 kJ‚mol -1 is presented for the Gibbs energy of formation for TAME in the gas phase at 298 K.

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