Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

Experimental data at 298.15Kand ambient pressure of excess molar volumes VE m and excess molar enthalpiesHEm are reported for two ternary and corresponding binary mixtures of an alkanol (ethanol or 1-butanol), triethylamine (TEA) and n-hexane. A vibrating-tube densitometer was used to determine VE m. HEm was measured using a quasi-isothermal flow calorimeter. The experimental results are used to test the applicability of the ERAS model for describing both thermodynamic excess properties of ternary mixtures containing an alkanol, a tertiary amine and a n-alkane. Qualitative agreement of calculated values with experimental resultswas achieved using only system-specific parameters determined from binary mixtures. The results are explained in terms of the self-association between alkanol molecules and cross-association between the alkanol and the tertiary amine.