Liquid-Liquid equilibria (LLE) have been measured for five ternary and two multicomponent mixtures containing cyclohexane, benzene, toluene, p-xylene, tetraethylene glycol (TTEG), and water at 60 degrees C and 140 degrees C. A new UNIFAC group was defined, and its parameters were determined from the experimental data; The calculated values are in good agreement with the experimental and literature data with sufficient accuracy for the engineering design.