VaporÀliquid equilibria (VLE) for 1-propanol + ethylene glycol monopropyl ether and 1-butanol + ethylene glycol monopropyl ether systems were investigated. The systems studied are isobaric VLE of the highly associating fluid mixtures, and the measurements were carried out at several pressures (60 kPa, 80 kPa, and 100 kPa) using Fischer VLE 602 equipment. A consistency test with respect to the experimental data was conducted using Fredenslud and Wisniak methods. Correlations of the experimental data were carried out using a two-term virial equation for vapor-phase fugacity coefficients and the three suffix Margules, Wilson, NRTL, and UNIQUAC models for liquid-phase activity coefficients. The results show good agreements with the experimental data at the C3E1 rich region but not at the alcohol rich region due to the strong and complex association of these systems. Additionally there are no azeotrope points.
Isobaric vapor–liquid equilibria (VLE) for the
2-propanol
+ ethylene glycol monopropyl ether and 2-butanol + ethylene glycol
monopropyl ether binary systems were measured and calculated. The
systems were measured using a Fischer VLE 602 apparatus at pressures
of 100 kPa, 80 kPa, and 60 kPa and were verified with consistency
testing using the Fredenslund and Wisniak methods. The experimental
results seem to be thermodynamically consistent considering the Wisniak
test results though the Fredenslund test results indicate the possibility
of thermodynamic inconsistency. Correlations of the measured data
were performed using a two-term virial equation for the fugacity coefficients
of the vapor phase and the nonrandom two-liquid (NRTL), universal
quasichemical (UNIQUAC), and Wilson activity coefficient models for
the activity coefficients of the liquid-phase. The calculation results
corresponded well with the experimental data at liquid-phase composition
but not at vapor-phase composition, because of difficulty in measuring
the vapor-phase and the strong and complicated association of these
systems.
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