ISOBARIC VAPOR-LIQUID EQUILIBRIA FOR BINARY SYSTEMS BENZENE + METHYL ACETATE AND BENZENE + METHYL BUTANOATE AT 101.313 KPA.

ALEJANDRA B. MARIANO; LELIA M.E. MUSSARI; ALBERTO G. CAMACHO; MIGUEL A. POSTIGO

Morelia, Mexico

Conferencia; VII Iberoamerican Conference on Phase Equilibria and Fluid Properties for Process Design; 2006

Isobaric vapor-liquid equilibria for the binary systems benzene + methyl acetate, and benzene + butyl acetate at the pressure of 101.31± 0.02 kPa have been determinated, using an all-glass recirculation still. From experimental data, the activity coefficients were calculated and satisfactorily correlated as function of the mole fraction using common excess Gibbs energy model equations proposed by Margules, van Laar, Wilson, NRTL, and UNIQUAC. The predictive group-contribution models UNIFAC and ASOG were applied. The thermodynamic consistency of the data was verified with two point-to-point tests. The binary systems showed positive deviations from Raoult’s law, and no azeotrope was found at this pressure. The compositions of the equilibrium phases were determinated indirectly from theirs density measurements, using an Anton Paar DSA-5000 densimeter. From a standard curve (density vs. composition), previously obtained for each binary mixture, it is possible to determinate the compositions of the phases in every equilibrium step. Additionally, from experimental density data, excess molar volumes at 298.15 K were calculated, and correlated with Redlich and Kister equation. The excess molar volumes were positive over the whole composition range for both binary systems studied.± 0.02 kPa have been determinated, using an all-glass recirculation still. From experimental data, the activity coefficients were calculated and satisfactorily correlated as function of the mole fraction using common excess Gibbs energy model equations proposed by Margules, van Laar, Wilson, NRTL, and UNIQUAC. The predictive group-contribution models UNIFAC and ASOG were applied. The thermodynamic consistency of the data was verified with two point-to-point tests. The binary systems showed positive deviations from Raoult’s law, and no azeotrope was found at this pressure. The compositions of the equilibrium phases were determinated indirectly from theirs density measurements, using an Anton Paar DSA-5000 densimeter. From a standard curve (density vs. composition), previously obtained for each binary mixture, it is possible to determinate the compositions of the phases in every equilibrium step. Additionally, from experimental density data, excess molar volumes at 298.15 K were calculated, and correlated with Redlich and Kister equation. The excess molar volumes were positive over the whole composition range for both binary systems studied.