Excess enthalpies of binary mixtures {xdioxane isomer plus (1-x)non-polar liquid} at 298.15 K

Molar excess enthalpies H-m(E) have been measured at 298.15 K for binary mixtures (1,3-dioxane or 1,4-dioxane + cyclohexane or n-pentane or 2,2,4-trimethylpentane or tetrachloroethene or benzene) by using a home-made flow calorimeter constructed newly for determining excess enthalpy in the dilute concentration range. The positive H-m(E) for alkane and cycloalkane systems were found. Those of the benzene systems were exothermic except for the 1,4-dioxane rich region. The experimental result was discussed qualitatively in view of intermolecular interactions in mixtures and the isomer effect on thermodynamic properties of dioxane mixtures. (C) 1997 Elsevier Science B.V.