Liquid-liquid equilibria were determined for the PEG(6000)-sodium citrate-H2O system at 298.15, 308.15 and 318.15 K. Furthermore, the osmotic virial and the UNIQUAC equations with temperature-dependent parameters and with or without Debye-Hockel term were used to correlate the phase behavior of this system. Better quality of fitting of the LLE data was obtained with the virial model than the model of UNIQUAC. Finally, the effect of temperature on the liquid-liquid equilibria is studied. (C) 2004 Elsevier B.V. All rights reserved.