Measurement and correlation of phase equilibrium of the aqueous two-phase system formed by Fe2(SO4)3Â +Â PEG 4000Â +Â H2O at different temperatures

The Chen-NRTL, modified Wilson and extended UNIQUAC models and the Othmer-Tobias and Bancroft equations were used to correlate the experimental tie-line data obtaining a good representation of the equilibrium. Furthermore, the Merchuk equation was used to correlate the binodal curves.