Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Excess molar enthalpies, HE m of binary mixtures of ethane-1,2-diamine (EDA) with methanol, ethanol, propan-1-ol, propan-2-ol, butan-1-ol and butan-2-ol were calculated from calorimetric data at T = 298 K and atmospheric pressure (81.5 kPa) with a Parr 1455 solution calorimeter. All the binary mixtures showed exothermic behavior over the entire range of compositions. From the experimental results, the excess partial molar enthalpies, HEi and excess partial molar enthalpies at infinite dilution, HE;1 i were calculated. Excess molar enthalpies, HE m values increase as the chain length of the alkanol is increased, showing minimum values varying from -4395 (methanol) to -1987 J mol 1 (butan-2-ol). The minimum HE m values were observed about 0.4 mol fraction of ethane-1,2-diamine (EDA). The experimental results were discussed in terms of intermolecular interactions, particularly hydrogen-bonding interactions between like and unlike molecules. Finally the experimental results were correlated by the Redlich Kister equation and the three thermodynamic models (Wilson, NRTL, and UNIQUAC) based on the local composition theory.