Enthalpy of Mixing (Excess Enthalpy)
Excess enthalpy data (HE) are important for the description of the correct temperature-dependence of the activity coefficients following the Gibbs-Helmholtz equation:
For fitting interaction parameters of gE - and group contribution models, applicable for a larger temperature range, enthalpy of mixing data directly provide the temperature dependence of the activity coefficients. Therefore, a combination of vapor-liquid equlibrium and excess enthalpy measurements is a good solution to cover a broad range of temperature.
Heats of mixing can be measured with different experimental devices.