Comments on “isobaric (vapor+liquid) equilibria for three binary systems (toluene+anisole, n-butylbenzene+anisole, and guaiacol+anisole) at 101.33kPa” (original) (raw)
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Isobaric vapor-liquid equilibria of the system toluene + n-butanol at 94.0, 70.5, and 56.4 kPa
1997
Isobaric vapor-liquid equilibrium (VLE) data were measured for the binary toluene + n-butanol system at 94.0, 70.5, and 56.4 kPa using a modified Malanowski equilibrium still. The experimental VLE data showed significant positive deviation from ideality. Upon reducing the pressure from 94.0 to 56.4 kPa, the azeotrope had shifted from an azeotropic mole fraction (of toluene) of 0.67 to 0.82. The thermodynamic consistency of the VLE data was verified by correlating the excess Gibbs energy with composition using the UNIQUAC model. The experimental data of this work, in addition to some literature VLE data for the same binary system, have been analyzed using three activity coefficient models: UNIQUAC, ASOG, and UNIFAC.
Isobaric vapor-liquid equilibrium data for binary systems
The Canadian Journal of Chemical Engineering, 1963
Isobaric vapor−liquid equilibrium data at an atmospheric pressure of 95.5 kPa are reported for the binary systems 2-methyl propan-2-ol (1) + tetraethoxylsilane (2) and 2-methyl propan-2-ol (1) + 1-phenyl ethanone (2). The experiments are done using a Swietoslawski-type ebulliometer. The liquid-phase mole fraction, x 1 , versus bubble-point temperature, T, measurements are found to be wellrepresented by the Wilson model. The optimum Wilson parameters are used to calculate the vapor-phase composition, activity coefficients, and excess Gibbs free energy. The results are discussed.
Journal of Chemical & Engineering Data, 2013
Consistent vapor-liquid equilibria (VLE) data have been determined at (5 and 15) kPa for the binary systems styrene + ethylbenzene, + o-xylene, + m-xylene, and + p-xylene in the temperature range (324 to 359) K. The binary systems exhibit very slight deviations from ideal behavior, and no azeotrope is present. The VLE data were well-correlated by the Wilson, NRTL, and UNIQUAC equations.
Thermochimica Acta, 1997
Isobaric vapour-liquid equilibrium at 40.0 and 101.3kPa is reported for the binary systems 2-butanol with chlorocyclohexane, chlorobenzene, bromocyclohexane and bromobenzene. Some of the studied systems show minimum temperature azeotropes. The VLE results were thermodynamically consistent and correlated with the Margules, van Laar, Wilson, NRTL and UNIQUAC equations. Predictions with the UNIFAC and ASOG methods were also made. i' 1997 Elsevier Science B.V.
Journal of Chemical & Engineering Data, 1999
Vapor-liquid equilibria were measured for binary systems of tert-butyl alcohol with toluene, isooctane, and methylcyclohexane at 101.3 kPa using a recirculating still. Experimental values of the vapor pressure of non-oxygenated pure components have been obtained. The accuracy of experimental measurements was (0.01 K in temperature, (0.01 kPa in pressure, and (0.001 in mole fractions. The results are thermodynamically consistent according to the point-to-point consistency test. The data were correlated with five liquid-phase activity coefficients models (Margules, Van Laar, Wilson, NRTL, UNIQUAC).
Isobaric Vapor−Liquid Equilibria of the Ternary System Toluene + Ethylbenzene + Amyl Acetate
Journal of Chemical & Engineering Data, 2004
Isobaric vapor-liquid equilibria (VLE) was measured for the ternary system toluene + ethylbenzene + amyl acetate. Boiling temperature (T) -liquid composition (x) relations were obtained at (26.66, 53.33, and 79.99) kPa by using a semimicroebulliometer. The Wilson model was used to correlate the binary T-x data and to predict VLE in the ternary system. Figure 2. Calculated boiling temperature isotherms for the ternary system toluene + ethylbenzene + amyl acetate at 79.99 kPa.
The Journal of Chemical Thermodynamics, 2010
In this work, isobaric (vapour + liquid) equilibrium data have been determined at (53.3 and 91.3) kPa for the binary mixtures of (1-propanol + 1-butanol). The thermodynamic consistency of the experimental values was checked by means the traditional area test and the direct test methods. According to the criteria for the test methods, the (vapour + liquid) equilibrium results were found to be thermodynamically consistent. The experimental values obtained were correlated by using the van Laar, Margules, Wilson, NRTL, and UNIQUAC activity-coefficient models. The binary interaction parameters of the activity-coefficient models have been determined and reported. They have been compared with those calculated by the activity-coefficient models. The average absolute deviation in boiling point and vapour-phase composition were determined. The calculated maximum average absolute deviations were 0.86 K and 0.0151 for the boiling point and vapour-phase composition, respectively. Therefore, it was shown that the activity-coefficient models used satisfactorily correlate the (vapour + liquid) equilibrium results of the mixture studied. However, the performance of the UNIQUAC model was superior to all other models mentioned.
The Canadian Journal of Chemical Engineering, 1991
Vapor-liquid equilibrium data for the binary systems methyl butanoate/ethanol and methyl butanoateipropan-1-01 at pressures of 114.66 and 127.99 kPa are presented. Both mixtures yield an azeotrope, the compositions (ester) of which decrease quasi-linearly as the pressure increases. The experimental data for all the binary mixtures were fitted to a suitable equation and then used for comparison with predictions by ASOG and UNIFAC methods. These group contribution models give a good cstimation of activity coefficients with an overall mean error less than 5% for all cases.
Journal of Chemical & Engineering Data, 2002
Isobaric vapor-liquid equilibrium has been experimentally studied for the binary mixtures 2-butanol + n-hexane and 2-butanol + 1-butylamine and for the ternary mixture 2-butanol + n-hexane + 1-butylamine at 101.3 kPa. The activity coefficients were found to be thermodynamically consistent, and they were satisfactorily correlated with the Margules, van Laar, Wilson, NRTL, and UNIQUAC equations. The activity coefficients were also compared with the results obtained from the application of the ASOG and modified UNIFAC group contribution methods. The boiling points of the solutions were correlated with compositions by the Wisniak-Tamir equations. The results obtained indicate that the binary system 2-butanol + n-hexane deviates positively from ideality, whereas 2-butanol + 1-butylamine deviates negatively from ideality. The ternary system deviates positively or negatively depending on the composition. Only the binary systems present azeotropy. Azeotropic behavior was not found in the ternary mixture.