Phase equilibria on four binary systems containing 3-methylthiophene

Isothermal vapor–liquid equilibrium (VLE) for 3-methylthiophene + 2,2,4-trimethylpentane at 368.15 K, 3-methylthiophene + 2,4,4-trimethyl-1-pentene at 368.15 K, 3-methylthiophene + cyclohexane at 348.15 K, and 3-methylthiophene + 1-hexene at 333.15 K were measured with a recirculation still. All systems exhibit positive deviation from ideality. No azeotropic behavior was found in all systems. The experimental results were correlated with the Wilson model and also compared with the original UNIFAC and UNIFAC-Dortmund predictive models. Analyses of liquid and vapor-phase composition were determined with gas chromatography (GC). All VLE measurements passed the used thermodynamic consistency tests (integral, infinite dilution and point test). The activity coefficients at infinite dilution are also presented.