Isobaric vapour-liquid equilibrium data have been measured for the binary systems toluene (1) þ acetic acid (2) and toluene (1) þ methyl ethyl ketone (2) at atmospheric pressure. An all-glass Fischer-Labodest-type apparatus, capable of handling pressures from 0.25 to 400 kPa and temperatures up to 523.15 K was used. The data were correlated by means of the NRTL, UNIQUAC, WILSON models and the applied UNIFAC model with satisfactory results; the relevant parameters are given and results were tested with regard to thermodynamic consistency using the methods of a modified Redlich-Kister and Herington equations.

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