Phase Equilibria in the Systems Cyclohexane + 2,2,4-Trimethylpentane and Ethyl 1,1-Dimethylethyl Ether + Cyclohexane + 2,2,4-Trimethylpentane at 94.00 kPa (original) (raw)
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Journal of Chemical & Engineering Data, 1999
Consistent vapor-liquid equilibria (VLE) at 94.00 kPa has been determined for the ternary system ethyl 1,1-dimethylethyl ether + 2,2,4-trimethylpentane + methylcyclohexane and the two constituent binaries ethyl 1,1-dimethylethyl ether + methylcyclohexane and 2,2,4-trimethylpentane + methylcyclohexane in the temperature range from 343 to 371 K. In addition, vapor pressures have been measured for methylcyclohexane from 331 to 374 K. According to the experimental results, the systems exhibit slight positive deviations from ideal behavior and no azeotrope is present. The VLE data have been correlated with the composition using the Redlich-Kister, Wilson, NRTL, UNIQUAC, and Wisniak-Tamir relations. These models, in addition to UNIFAC, allow good prediction of the VLE properties of the ternary system from those of the pertinent binary systems.
Physics and Chemistry of Liquids, 2001
Consistent vapor-liquid equilibria (VLE) at 94.00 kPa has been determined for the ternary system ethyl 1,1-dimethylethyl ether + 2,2,4-trimethylpentane + methylcyclohexane and the two constituent binaries ethyl 1,1-dimethylethyl ether + methylcyclohexane and 2,2,4-trimethylpentane + methylcyclohexane in the temperature range from 343 to 371 K. In addition, vapor pressures have been measured for methylcyclohexane from 331 to 374 K. According to the experimental results, the systems exhibit slight positive deviations from ideal behavior and no azeotrope is present. The VLE data have been correlated with the composition using the Redlich-Kister, Wilson, NRTL, UNIQUAC, and Wisniak-Tamir relations. These models, in addition to UNIFAC, allow good prediction of the VLE properties of the ternary system from those of the pertinent binary systems.
Isobaric vapor-liquid equilibrium (VLE) data at 94.00 kPa have been determined for the ternary system 1-hexene + ethyl 1,1-dimethylethyl ether + benzene and for its constituent binary system 1-hexene + 2,2,4-trimethylpentane (isooctane), in the temperature range 335 to 360 K. According to the experimental results, the system 1-hexene + 2,2,4-trimethylpentane exhibits ideal behavior. The ternary system exhibits slight positive deviations from ideal behavior, and no azeotrope is present. The VLE data have been correlated with the mole fraction using the Redlich-Kister, Wilson, NRTL, UNIQUAC, and Wisniak-Tamir relations. These models, in addition to UNIFAC, allow good prediction of the VLE properties of the ternary system from those of the pertinent binary systems.
Journal of Chemical & Engineering Data, 2001
Consistent vapor-liquid equilibria data at 94.00 kPa have been determined for the ternary system 1-hexene + ethyl 1,1-dimethylethyl ether + benzene and for its constituent binary 1-hexene + benzene, in the temperature range 334-351 K. According to the experimental results, the systems exhibit slight positive deviations from ideal behavior and no azeotrope is present. The VLE data have been correlated with the mole fraction using the Redlich-Kister, Wilson, NRTL, UNIQUAC, and Tamir relations. These models, in addition to UNIFAC, allow good prediction of the VLE properties of the ternary system from those of the pertinent binary systems.
Fluid Phase Equilibria, 2006
The combination of difluoromethane (R32), 1,1-difluoroethane (R152a), and 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) could be a potential substitute for hydrofluorocarbon refrigerants. Reliable vapor liquid equilibrium (VLE) data are important thermodynamic data in evaluating the performance of refrigeration cycles and determining their optimal compositions. In this work, we measured the VLE data for binary mixtures of R32 + R152a and R152a + R1234yf, and ternary system of R32 + R152a + R1234yf. The measurements were carried out by using the AnTLcirCapValVis analytical method over the temperature range from 283.15 to 323.15 K. The standard uncertainties of temperature, pressure, and mole fractions are 10 mK, 0.5 kPa, and 0.005, respectively. The Peng−Robinson−Stryjek−Vera equation of state combined with the Wong−Sandler mixing rule and the nonrandom two-liquid activity coefficient model was employed to correlate the parameters of binary mixtures and predict the ternary VLE property. The predicted VLE data and K-value for the ternary system show good agreement with the experimental results.
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).
Phase Equilibria of the Ternary System Benzene + Cyclohexane + 1-Pentanol at 101.3 kPa
Journal of Chemical & Engineering Data, 2001
Vapor-liquid equilibrium at 101.3 kPa has been measured for the ternary system benzene + cyclohexane + 1-pentanol in an isobaric equilibrium still with secondary recirculation of both vapor and liquid phases. Satisfactory results were obtained for the prediction of activity coefficients and the equilibrium compositions with the ASOG and UNIFAC group contribution models; low standard deviations of vapor mole fraction and temperature were computed. Azeotropic behavior was observed only in the benzene + cyclohexane mixture. The correlation parameters for the Tamir-Wisniak and UNIQUAC equations are presented.
Phase equilibria in the ternary system ethyl 1,1-dimethylethyl ether+heptane+octane
Fluid Phase Equilibria, 1999
Vapor-liquid equilibrium at 94 kPa has been determined for the ternary system ethyl 1,1-dimethylethyl ether Ž . ETBE q heptaneq octane. The system deviates slightly from ideality and no azeotrope is present. The ternary activity coefficients and the boiling points of the system have been correlated with the composition using the Redlich-Kister, Wilson, NRTL, UNIQUAC, UNIFAC, and Wisniak-Tamir relations. Most of the models allow a very good prediction of the activity coefficients of the ternary system from those of the pertinent binary systems. q
Journal of Chemical and Engineering Data, 2006
Liquid-liquid equilibrium (LLE) data for four ternary systems comprising cyclohexane + (benzene, toluene, ethylbenzene, or cumene) + sulfolane have been measured at 303.15 K and at atmospheric pressure. The LLE data for a six-component system including (cyclohexane + benzene + toluene + ethylbenzene + cumene + sulfolane) has also been measured at the above conditions. The reliability of the experimental data was tested using the Othmer-Tobias correlation. The LLE data were then analyzed using a UNIFAC model with groupinteraction parameters extracted from the UNIFAC-LLE data bank and a NRTL version with temperature-dependent binary parameters determined from the experimental LLE data (NRTL/2), both as programmed by the Aspen Plus simulator. Based on the analysis of these data, both models represented the experimental data with sufficient accuracy as revealed from the very small values of the root mean square error and the average absolute deviation in composition.