Vapour—liquid equilibrium in binary systems formed by acetonitrile, 2-butanone and 1,2-dichloroethane

Isothermal vapour—liquid equilibria have been determined for 2-butanone + acetonitrile at 333.67 K, and for 2-butanone + 1,2-dichloroethane and acetonitrile + 1,2-dichloroethane at 333.15 K using a dynamic method. The apparatus used in these studies for the precise measurement of complete vapour—liquid equilibrium data is described and the reliability and accuracy of the measured data are considered in terms of the activity coefficients and of the dependences of the molar excess Gibbs energies on composition. Experimental inaccuracies are estimated for statistical treatment of the data both in terms of correlations and in consistency tests.