Isobaric Vapor−Liquid Equilibria for Binary and Ternary Mixtures with Cyclohexane, Cyclohexene, and Methyl Isobutyl Ketone at 100 kPa

Abstract

Consistent vapor-liquid equilibrium (VLE) data at 100 kPa have been determined for the ternary system cyclohexane + cyclohexene + methyl isobutyl ketone and two constituent binary systems: cyclohexane + methyl isobutyl ketone and cyclohexene + methyl isobutyl ketone. Both binary systems show positive deviations from ideal behavior and do not present an azeotrope. The VLE data have been correlated by the Wilson, UNIQUAC, and NRTL equations. The ternary system does not present an azeotrope and is well predicted from binary interaction parameters. Prediction with the UNIFAC method has also been obtained.

Evaluation of Diethyl Carbonate and Methyl Isobutyl Ketone as Entrainers for the Separation of 1-Hexene and n-Hexane

“…The molar virial coefficients B ii and B ij were estimated by the method of Hayden and O’Connell using the molecular parameters suggested by Prausnitz et al The critical properties of all components were taken from DIPPR . The pure component vapor pressures were determined previously, ,, and the equation and the parameters to calculate them are listed in Table .…”

“… a Vapor pressure equation: ln P ° (kPa) = A + B /( T (K) + C ). b Parameters obtained in ref . c Parameters obtained in ref . d Parameters obtained in ref . …”

“…These results are completely different from the obtained in the mixture of cyclohexane and cyclohexene with the same solvents. 4,5 So, in the separation of paraffins and olefins, it can be concluded that the solvent effects on vapor−liquid equilibrium of linear and cyclic hydrocarbons mixtures can be very different, and it would be very risky to extrapolate results and to recommend the same entrainers for separating different kinds of paraffin and olefin mixtures, even with the same number of carbon atoms.…”

“…These two solvents were previously studied in the separation of cyclohexane and cyclohexene by extractive distillation with satisfactory results. 4,5 In this work, VLE data at 100 kPa have been measured for the two ternary systems 1-hexene (1) + n-hexane (2) + diethyl carbonate (3a) and 1-hexene (1) + n-hexane (2) + methyl isobutyl ketone (3b) and constituent binary systems. Previously, 7 VLE data for the binary system 1-hexene (1) + n-hexane (2) were reported.…”

“…The present work is part of the thermodynamic research on the selection of green solvents for the separation of paraffins and olefins by extractive distillation. − In this study, 1-hexene and n -hexane are taken to represent olefins and paraffins mixtures, and the feasibility of diethyl carbonate and methyl isobutyl ketone as possible entrainers is investigated. These two solvents were previously studied in the separation of cyclohexane and cyclohexene by extractive distillation with satisfactory results. , …”