Measurements and correlation of vapour–liquid equilibria of 2-butanone and hydrocarbons binary systems at two different pressures

Consistent isobaric vapour–liquid equilibrium data have been measured for 2-butanone + n-hexane, 2-butanone + n-heptane, and 2-butanone + 2,2,4-trimethylpentane at two different pressures. All binary systems present a minimum boiling azeotrope at both pressures, and show that the azeotropic compositions are weakly dependent on pressure. The equilibrium data were correlated using the Wilson, NRTL, and UNIQUAC models for which the parameters are reported.

► In this paper, we study the vapour–liquid equilibrium for 2-butanone + n-hexane, 2-butanone + n-heptane and 2-butanone + 2,2,4-trimethylpentane. ► The sensitivity of azeotropes to changes in pressure have been study for these systems. ► Data reduction with Wilson, NRTL and UNIQUAC models has carried out. ► Pressure-swing distillation is not much more attractive to separate these azeotropic mixtures.