Abstract
The liquid–liquid equilibria for ethylene oxide–propylene oxide random copolymer (EOPO)–hydroxypropyl starch (HPS)–water aqueous two-phase systems with various polymer molecular weights were measured at 298.15 K. A generalized multicomponent osmotic virial equation was proposed to predict the phase behavior of new aqueous two-phase systems. By using the vapor–liquid equilibrium (VLE) and/or part of liquid–liquid equilibria (LLE) data (as few as possible), the LLE data of polyethylene glycol (PEG)–HPS, EOPO–HPS and EOPO–salt aqueous two-phase systems were successfully predicted. The results show that the model can give good representation of the phase diagrams.
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