Isobaric vapor–liquid equilibrium for binary systems containing benzothiophene

Isobaric vapor–liquid equilibrium (VLE) of the following systems was measured with a recirculation still: benzothiophene + dodecane at 99.6 kPa, benzothiophene + 1-dodecene at 100.1 kPa, and benzothiophene + 1-octanol at 100 kPa. All systems studied exhibit positive deviation from Raoultʹs law. A minimum temperature azeotrope was found in the systems benzothiophene + dodecane (x1 = 0.491, P = 99.6 kPa, T = 484.72 K) and benzothiophene + 1-dodecene (x1 = 0.185, P = 100.1 kPa, T = 484.45 K). No azeotropic behavior was found in benzothiophene + 1-octanol system at 100 kPa. The experimental results were correlated with the Wilson model and compared to COSMO-SAC predictive model. Liquid and vapor phase compositions were determined with gas chromatography. All measured data sets passed the thermodynamic consistency tests. The activity coefficients at infinite dilution are also presented.