Thermodynamics of molecular interactions of 1,2-dibromoethane + aromatic hydrocarbon mixtures at 308.15K

Abstract

The excess volumes and enthalpies of mixing of binary mixtures of 1,2-dibromoethane with benzene, toluene, <em>o</em>-xylene, <em>m</em>-xylene and <em>p</em>-xylene have been measured experimentally over the whole composition range at 308.15K. The data have been explained qualitatively on the basis of electron-donor/ acceptor interactions between 1,2-dibromoethane and the aromatic hydrocarbons and also in terms of the loss of favourable orientational order of the pure components. Flory's theory is not able to predict correctly the <em>V^E </em>and <em>H</em>^E values of systems studied. However, the Sanchez and Lacombe. Theory correctly predicts the change of sign of <em>H</em>^E values with change of mole fraction. Calculated <em>H</em>^E by this theory is of the same order as experimental <em>H</em>^E<em>. </em>Calculated <em>V</em>^E values show relatively poor agreement with the corresponding experimental <em>V</em>^E values.