Liquid-liquid equilibrium (LLE) data for the system 1-methyl propyl ethanoate + acetic acid + water Were Measured at temperatures of (283.15 and 323.15) K. The temperature influence on the LLE data is very small in the temperature range Studied. The NRTL and UNIQUAC models were used to correlate the data for both ternary systems. The interaction parameters obtained from both models Successfully correlated the equilibrium compositions.