Excess volumes of binary mixtures of triethylamine and tributylamine with alkanes and alkylamines at 298.15, 303.15 and 313.15 K

Abstract

Excess volumes (V^E) and their temperature dependence (dV^E/dT) have been investigated from density measurements, using a vibrating densitometer DMA 60/602, for binary mixtures of triethylamine and tributylamine with hexane, octane, iso-octane (2,2,4-trimethylpentane), propylamine, butylamine, hexylamine and octylamine, and of tributylamine with decylamine and dodecylamine. Thermal expansion coefficients α and excess thermal expansion coefficients α^E were evaluated from the results. The Prigogine–Flory–Patterson theory has been applied to estimate interaction, free volume and internal pressure contributions to V^E and to estimate dV^E/dT for the mixtures.