(Liquid + liquid) equilibrium (LLE) and binodal curve data were determined for the systems (water + phenol + tert-butanol) at T= 298.15 K, (water + phenol + 2-butanol) and (water + phenol + 1-butanol) at T= 298.15 K and T= 313.15 K by the combined techniques of densimetry and refractometry. Type I curve (for tert-butanol) and Type ll curves (for 1- and 2-butanol) were found. The data were correlated with the NRTL model and the parameters estimated present root mean square deviations below 2% for the system with tert-butanol and lower than 0.8% for the other systems. (C) 2010 Elsevier Ltd. All rights reserved.