Excess Enthalpies of 1-Bromobutane + Oxaalkanes at 298.15 K. Comparison with Disquac Predictions

Abstract

Excess enthalpies, HE, at 298.15 K and atmospheric pressure are reported for binary liquid mixtures of 1-bromobutane + oxaalkane of the general formula 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 characterized 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 depend on the environment of the O group. The model provides a fairly consistent description of the experimental data.