Ternary liquid-liquid equilibria for mixtures of water, diisopropyl ether and toluene

In order to examine the possibility of using diisopropyl ether (DIPE) as a gasoline additive and the phase separation problems of DIPE in water, phase diagram studies need to be performed at room temperature and atmospheric pressure to guarantee that there is no phase separation. In this work, ternary liquid-liquid equilibria (LLE) for the water + DIPE + toluene was measured at 298.15K and ambient pressure. The experimental LLE data had been satisfactorily correlated by using the modified UNIQUAC model with binary and ternary parameters. The calculated results were compared with the experimental LLE data. The ternary LLE results calculated by the modified UNIQUAC model with binary, ternary parameters gives better agreement with the experimental results than those by the modified UNIQUAC model with binary parameters only.