(Liquid + liquid) equilibrium of (NaNO3 + PEG 4000 + H2O) ternary system at different temperatures

► LLE data for the ATPS NaNO3 + PEG 4000 were determined at T = (288.15 and 308.15) K. ► The experimental data shown that the temperature increases as STL and biphasic area increase. ► The Chen-NRTL, modified Wilson and UNIQUAC models were used to correlate the experimental tie-line data. ► The results show that the quality of fitting is better with the UNIQUAC model.