Liquid−liquid equilibrium data are critical for designing the extraction equipment or calculating the thermodynamic limit of a given separation. In this work, the LLE data were measured for the cyclohexane + (benzene, + toluene, + ethylbenzene, or + o-xylene) + 4-methyl-N-butyl pyridinium tetrafluoroborate ([bmpy]BF4) systems at 303.15 K under atmospheric pressure. The consistency of the measured LLE data was tested using the Othmer−Tobias correlation and the root-mean-square deviation (rmsd) in the mass fraction of [bmpy]BF4 in the lower phase and the average value of the absolute difference (AAD) between experimental mass fraction of cyclohexane in the upper phase and that calculated using the Othmer−Tobias correlation.

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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.

Liquid-liquid equilibrium for cyclohexane + ethylbenzene + sulfolane have been measured at the temperatures (303.15, 313.15, and 323.15) K and at atmospheric pressure. The reliability of the experimental data was tested using the Othmer-Tobias correlation. The liquid-liquid equilibrium (LLE) data were then analyzed using a UNIFAC model with group interaction parameters extracted from the LLE data bank (UNIF-LL) 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. On the basis of 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 (RMSE) and the average absolute deviation (AAD) in composition.

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