The extraction of butylbenzene from n-tetradecane using three ionic solvents ([bmim][PF6], [hmim][PF6], and [omim][PF6]) was studied at two temperatures (313.15 and 333.15 K) and under atmospheric pressure (101.3 kPa). Experimentally determined distribution coefficients (K) and solvent selectivities (S) were plotted against the mole fraction of butylbenzene in the solvent phase; improved results were obtained compared to the conventional solvent, sulfolane. The distribution coefficient and selectivity both increased with increasing alkyl chain length of the 1-alkyl-3-methylimidazolium moiety of the solvent cation. The universal quasichemical model was satisfactorily applied for correlating the experimental liquid-liquid equilibrium data of all three systems. Furthermore, comparison with literature results revealed that the distribution coefficients decreased with increasing paraffin carbon number.