In this study, imidazole-terminal poly(ethylene glycerol) (I-PEG)
(Fig. 1) is used as phase-forming polymer to extract penicillin
in ATP system. Hydrophobic ionic liquid [Bmim]PF6 (1-butyl-
3-methylimidazole hexafluoraphosphate) (Fig. 1) was chosen to
recover the phase-forming polymer from ATP using pH difference
as the driving force.