Phase equilibria of three binary systems containing 2,5-dimethylthiophene and 2-ethylthiophene in hydrocarbons

Abstract

Isobaric vapor–liquid equilibrium (VLE) data for binary systems 2-ethylthiophene + n-decane, 2,5-dimethylthiophene + n-decane and 2-ethylthiophene + mesitylene were measured at 101.33 kPa using the modified Rose–Williams equilibrium still. Gas chromatography was used to analyze compositions of the samples from the vapor–liquid equilibrium system. Thermodynamic consistency of the experimental data were checked both with the Herington consistency test and point-to-point test of Van Ness, which ensure the reliability of experimental data. The experimental data were correlated by the Wilson and non-random two-liquid (NRTL) activity coefficient models and were compared with original UNIFAC predictive model. The corresponding parameters for the Wilson and NRTL models were obtained. The results show that the calculated values of the vapor-phase mole fraction and bubble point temperature by Wilson, NRTL and UNIFAC models agree well with the experimental data.