Isobaric low-pressure vapor–liquid equilibrium data of the system monochloroacetic acid + dichloroacetic acid + diethylene glycol dipentyl ether and the constituent binary systems

In this study, binary and ternary VLE data have been determined at 5, 7.5, and 10 kPa for the system monochloracetic acid (MCA) + dichloroacetic acid (DCA) + diethylene glycol dipentyl ether (DGDP). The extractant DGDP enhances the relative volatility of the MCA/DCA system from 1.2 without extractant up to 4. The non-ideal behavior in the liquid and vapor phase was reasonably well correlated with the NRTL and Hayden–O’Connell (HOC) model, respectively. The binary and ternary VLE data were correlated separately to obtain a better description of both datasets.

► Binary + ternary VLE data were determined at vacuum conditions.
► All experimental data were correlated well with the NRTL–Hayden–O’Connell model.
► Diethylene glycol dipentyl ether can increase α of the monochloroacetic acid/dichloroacetic acid system up to 4.