Liquid liquid equilibrium (LLE) data for the ternary system sec-butyl alcohol + sec-butyl acetate + ethylene glycol were determined at 298.2, 308.2, and 318.2 K under 101.3 kPa. The extraction capacity was represented by separation factors. Separation factors at the studied temperatures are in the range of 1.33-19.66. Also, separation factors decrease with the rise of temperature in general. The nonrandom two-liquid and universal quasi-chemical models were applied to correlate the experimental LLE data measured, and the corresponding binary interaction parameters were obtained. The overall root-mean square deviation is less than 0.4%. Also, the reliability of binary interaction parameters was validated by the topological analysis based on the Gibbs tangent plane test using a graphical user interface.