Measurement of phase diagrams for new aqueous two-phase systems and prediction by a generalized multicomponent osmotic virial equation

摘要

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. (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 39]