Vapor-liquid and chemical reaction equilibria in the synthesis of 2-methoxy-2-methylbutane (TAME)

Isobaric vapor-liquid equilibrium (VLE) data (T-x-y) for the binary systems methanol/2-methoxy-2-methylbutane (TAME), methanol/2-methyl-2-butene, and methanol/2-methylbutane were obtained at 101.3 kPa. All systems showed a po sitive deviation from ideality with a minimum-boiling-point azeotrope. The activity coefficients were calculated with the use of the Wilson equation w here the parameters of the binary systems were determined on the basis of t he experimental data. Other VLE data relevant to TAME synthesis were collec ted from the literature, and the respective parameters were adjusted. Earli er reported results of the reaction equilibrium experiments on the liquid-p hase formation of TAME were reanalyzed. On the basis of the experimental re action 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.