Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Binary mixtures of tributylamine with aromatics (toluene, ethylbenzene, o-xylene, m-xylene, p-xylene and nitrobenzene) were selected in order to investigate intermolecular interactions by calculation of their excess molar volume, from density measurements. Thermal expansion coefficients, and their excess values were obtained from the density data. The excess molar volume values were positive for all the mixtures except for the (tributylamine + nitrobenzene) binary mixture over the entire range of composition and lower temperatures and become more positive with rising temperature. At high temperatures, sigmoidal behavior was observed for the mixture of (tributylamine + o-xylene). The mixture of (tributylamine + nitrobenzene) shows negative values for excess molar volume and become more negative with increasing temperature. The experimental data were correlated to Redlich-Kister equation. In order to characterize the excess molar volume values, the extended real associated solution (ERAS) model was applied at different temperatures.