As a new green separation technology, ionic liquid-based aqueous two-phase systems (ATPSs) are attracting the attention of a growing number of scientists and engineers in recent years. These new ATPSs have many advantages shared by ionic liquids and traditional ATPSs, such as low viscosity, little emulsion formation, no need of using volatile organic solvent, and quick phase separation. At present, most of the researches on the ATPSs reported in literature focused on the ionic liquids based on imidazole and...