LIQUID-LIQUID EQUILIBRIA FOR MIXTURES OF DIISOBUTYL KETONE PLUS AN ALKANOL PLUS WATER AT 298.15-K

Liquid-liquid equilibrium data are presented for mixtures of 2,6-dimet hyl-4-heptanone (diisobutyl ketone) + an alkanol + water at 298.15 K. The alkanols are methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 2-methyl-1-propanol, and 2-methyl-2-propanol. The addition of ethanol, 2-propanol, or 2-methyl-2-propanol is found to increase t he solubility of water in the diisobutyl ketone more than the other al kanols. The relative mutual solubility of methanol ana ethanol is high er in the water layer than in the diisobutyl ketone layer. The convers e is true for the other alkanols. Three three-parameter equations have been fitted to points on the binodal curve. The results are compared and discussed in terms of statistical consistency. The NRTL and UNIQUA C models were used to correlate the experimental results and to calcul ate the phase compositions of the ternary systems. The NRTL equation f itted the experimental data better than did the UNIQUAC equation, and the average root mean square deviation phase composition error was 0.0 13 for the NRTL model and 0.046 for the UNIQUAC model.