Excess enthalpies of 1-bromobutane plus oxaalkanes at 298.15 K. Comparisonwith Disquac predictions

Excess enthalpies, H-E, at 298.15 K and atmospheric pressure are reported f or binary liquid mixtures of 1bromobutane + oxaalkane of the general formul a CH3-(CH2)(s-1)-O-(CH2)(t-1)-CH3. The experimental results are interpreted in terms of the DISQUAC group contribution model. The systems are characte rized by three types of contact surfaces: oxygen (O), bromo (Br) and alkane . The interchange energy parameters of the alkane/O and alkane/Br contacts were determined independently from the study of n-alkane + oxaalkane and n- alkane + bromo systems. The interaction parameters of the O/Br contacts are reported in this work. The quasichemical and the dispersive parameters dep end on the environment of the O group. The model provides a fairly consiste nt description of the experimental data.