Departure enthalpy, excess enthalpy, and residual enthalpy are distinct thermodynamic properties that represent deviations from ideal behavior. Residual enthalpy pertains to pure gases or gaseous mixtures, indicating the difference from an ideal gas at the same temperature and pressure. Excess enthalpy applies to liquid solutions, reflecting the deviation from an ideal liquid solution under similar conditions. These properties can be estimated using an equation of state, as detailed in Chapter 11 of "Introduction to Chemical Engineering Thermodynamics" by Smith and Van Ness or Perry's Handbook.
PREREQUISITESChemical engineers, thermodynamics students, and researchers in physical chemistry who seek to deepen their understanding of enthalpic properties and their applications in real-world scenarios.
A residual property of a pure gas or gaseous mixture represents the value of the property relative to an ideal gas or ideal gas mixture at the same temperature or pressure. So the word residual applies to gases.maistral said:Summary:: The title.
I am getting confused as these three kinds of 'enthalpies' keep on appearing in the literature I am reading. How are they different? From what I can understand, they are all deviations from ideality, and that they can be 'estimated' using an equation of state. Other than that, how do they differ from each other?