(Liquid + liquid) equilibria of (water + ethanol + 2,6-dimethyl-4-heptanone) from 0.1 to 200 MPa at 298.15 and 323.15 K

Abstract

Experimental tie-line measurements were made on (water + ethanol + 2,6-dimethyl-4-heptanone) in the range 0.1 to 200 MPa at 298.15 and 323.15 K. The binodal curves obtained show that the immiscibility region is little affected by pressure, but contracts slightly at elevated temperatures. As the temperature and the pressure rise, the plait point shifts towards the aqueous phase at lower mole fraction of ethanol and towards the organic phase at higher mole fraction of ethanol, respectively. The variations of the tie-line and of the distribution curve of ethanol with temperature are opposite in direction to those with pressure. The distribution coefficient D 2 of ethanol depends on temperature and pressure, but weakly on the mole fraction of ethanol in the organic phase, except near the plait point. The tie lines were satisfactorily correlated by the Othmer-Tobias equation on a mass-fraction basis.