Vapor–Liquid Equilibrium for Ternary and Binary Mixtures of Tetrahydrofuran, Cyclohexane, and 1,2-Propanediol at 101.3 kPa

Abstract

Vapor–liquid equilibrium (VLE) data of the binary systems tetrahydrofuran + cyclohexane, tetrahydrofuran + 1,2-propanediol, and cyclohexane + 1,2-propanediol were reported at 101.3 kPa, as well as the ternary system tetrahydrofuran + cyclohexane + 1,2-propanediol. The results showed that the 1,2-propanediol was a good solvent which can break the binary azeotrope and effectively improve the relative volatility for the system of tetrahydrofuran and cyclohexane. Then, the equations of nonrandom two-liquid (NRTL), universal quasichemical (UNIQUAC), and Wilson were used to correlate the activity coefficients, and the results indicate that the NRTL model provides the best description of the phase equilibrium data.