s ramtin - master of science, Department of chemical engineering, faculty of engineering, University of Guilan, Rasht, Iran
s.s ashraf - assistant professor, Department of chemical engineering, faculty of engineering, University of Guilan, Rasht, Iran
h Ghanadzadeh Gilani - full professor, Department of chemical engineering,faculty of engineering, University of Guilan, Rasht, Iran

The tie-line data for mixture of (water + valeric acid + 2-ethyl-1-hexanol) have been determined experimentally at T = (298.2, 303.2) K and atmospheric pressure. The phase diagrams were obtained by determining tie-lines. This ternary system exhibits type-2 behavior of LLE. Distribution coefficients and separation factors were evaluated over the immiscibility regions. The Othmer-Tobias and hand correlation equation was used to ascertain the quality of the LLE data for each system.

Liquid–liquid equilibria (LLE), Tie-line data, Valeric acid, 2-ethyl-1-hexanol, water