Vapor-liquid equilibria of the systems ethyl ethanoate plus 2-methyl-2-butanol, 2-methyl-1-propanol plus 3-methyl-1-butanol, and cyclohexanol plus benzyl alcohol at 101.32 KPa

Abstract

Isobaric vapor-liquid equilibrium (VLE) data have been measured for the binary systems ethyl ethanoate + 2-methyl-2-butanol, 2-methyl-1-propanol + 2-methyl-1-butanol, and cyclohexanol + benzyl alcohol at 101.32 kPa, using a dynamic method. None of these systems show an azeotrope, and all mixtures studied exhibit positive deviations from ideality. Consistency of the experimental results has been verified by point-to-point and area consistency tests. The results were correlated using a modified linear solvation energy relation (LSER) and various versions of UNIFAC and ASOG activity coefficient models. Details underlying some aspects of selection of an appropriate algorithm for fitting the data are discussed. Finally, the reliability of group contribution methods has been analyzed statistically on the basis of both the dimensionless group G(E)/RT and gamma(i), using a log-ratio objective function.