In this work liquid-liquid equilibrium (LLE) data (water + 2,3-butanediol + 2-ethyl-1-hexanol) were measured under atmospheric pressure and at different temperature ranges of 300.2, 305.2, 310.2, and 315.2 K. The UNIQUAC model was able to adequately represent the type 1 phase behavior observed over this temperature ranges in this ternary system. Using the experimental results, the values of the interaction parameters between each pair of components in the system were obtained for this model. The results obtained in this work were satisfactory and they were in accordance with root means square deviation (RMSD%). The root mean square deviation between the experimental and calculated mole percents was 6.26%. The mutual solubility of 2-ethyl-l-hexanol and water was also studied by addition of 2,3-butanediol at different temperatures. (c) 2006 Elsevier B.V. All rights reserved.