Liquid−Liquid Equilibrium of Ternary Systems of Cyclohexane + (Benzene, + Toluene, + Ethylbenzene, or + o-Xylene) + 4-Methyl-N-butyl Pyridinium Tetrafluoroborate Ionic Liquid at 303.15 K

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]BF 4 ) 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]BF 4 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.