Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

Consistent vapor-liquid equilibrium (VLE) data at 101.3 kPa have been determined for the ternary system dipropyl ether + 1-propyl alcohol + butyl propionate and two constituent binary systems: dipropyl ether + butyl propionate and 1-propyl alcohol + butyl propionate. The dipropyl ether + butyl propionate system exhibits ideal behavior, and the 1-propyl alcohol + butyl propionate system shows positive deviations from Raoult s law. No additional azeotropes are present. The activity coefficients of the solutions were correlated with its composition by the Wilson, NRTL, and UNIQUAC models. The ternary system is well-predicted from binary interaction parameters. Butyl propionate breaks the dipropyl ether/1-propyl alcohol binary azeotrope. However, the change of phase equilibria behavior is small; therefore, this solvent is not such an effective agent to this azeotrope mixture separation. In fact, the mean relative volatility on a solvent-free basis is 0.82 (close to unity).