Isobaric vapor-liquid equilibrium in the systems methyl 1,1-dimethylethyl ether+2-methyl-2-propanol and methyl 1,1-dimethylethyl ether+2-methylpentane+2-methyl-2-propanol

Consistent vapor-liquid equilibrium data for the binary and ternary systems methyl 1,1-dimethylethyl ether (MTBE) + 2-methyl-2-propanol (TBA) and meth yl 1,1-dimethylethyl ether (MTBE) + 2-methyl-pentane + 2-methyl-2-propanol (TBA) are reported at 101.3 kPa at temperatures in the range 328 to 356 K. The results indicate that the systems deviate positively from ideality and that no azeotrope is present. The activity coefficients of the solutions we re correlated with composition by Wilson, NRTL, and UNIQUAC models. It is s hown that the models allow a very good prediction of the phase equilibrium of the ternary system using the pertinent parameters of the binary system. In addition, the Wisniak-Tamir relations were used for correlating bubble-p oint temperatures.