Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

Isobaric vapor-liquid equilibrium (VLE) for methylcyclohexane + 2-methoxyethanol and methylcyclohexane + 2-ethoxyethanol systems were investigated to provide a basis for the design of the separation process of both systems by distillation. The measurements were carried out at 50.00 and 101.33 kPa using an all-glass dynamic recirculating still (Fischer VLE 602). The results showed that both systems form the minimum boiling azeotropes at 50.00 and 101.33 kPa. All the VLE data passed the thermodynamic consistency test by Herington method and showed positive deviations from ideal behavior. The correlationsof the experimental data were completed using the Wilson-HOC, NRTL-HOC and UNIQUAC-HOC models. The results showed all three models had good agreement with the experimental data, especiallythe NRTL-HOC and UNIQUAC-HOC models. The azeotropic temperatures and compositions at 50.00 and101.33 kPa were determined with the UNIQUAC-HOC model, respectively, which showed that the concentration of methylcyclohexane of both azeotropic systems tended to increase with the descent of the system pressure.