Thermodynamics of molecular interactions of ethyl iodide with aromatic hydrocarbons at 308.15 K

Abstract

The excess volumes and enthalpies of mixing of binary mixtures of ethyl iodide 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 308.15 K. Qualitatively, the data have been explained on the basis of electron donor-acceptor interactions between ethyl iodide and aromatic hydrocarbons, and the loss of favourable orientational order of the pure components. Flory's theory correctly predicts the sign and to some extent magnitude of the <em>V</em>^Eand <em>H</em>^E values. However, there is a relatively poor agreement between the experimental and calculated <em>V</em>^E and <em>H</em>^E values on the basis of Sanchez and Lacombe's theory.