Abstract
The Helmholtz free energy or an equation of state relating temperature, pressure, volume and composition plays a key role in the calculation of phase equilibria and thermodynamic properties. Such information is usually available for vapor, partially available for liquids, and rarely available for solids. Depending on the information available, different methods are used for properties calculation. In this study, various methods were systematically presented and their relations with available information were comprehensively discussed.
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Abbreviations
- A:
-
Helmholtz free energy
- P:
-
pressure
- S:
-
entropy
- T:
-
temperature
- V:
-
volume
- f:
-
fugacity
- n:
-
number of moles
- s:
-
molar entropy
- u:
-
molar internal energy
- v :
-
molar volume
- -v :
-
partial molar volume
- x:
-
mole fraction
- φ :
-
fugacity coefficient
- μ :
-
chemical potential
- E:
-
excess properties
- l :
-
liquid phase
- s:
-
solid phase
- sl:
-
property change on solid-liquid transition
- sat:
-
saturated liquid or solid
- v :
-
vapor phase
- α, Β, π :
-
a phase
- 0:
-
ideal gas state at 1 bar
- ∞:
-
infinite dilution state
- *:
-
activity coefficient normalized for the infinite dilution reference state
- i:
-
a component
- pure, i:
-
a component at the pure state
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Lee, C.S., Kang, J.W. On the information and methods for computing phase equilibria and thermodynamic properties. Korean J. Chem. Eng. 22, 474–478 (2005). https://doi.org/10.1007/BF02719429
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DOI: https://doi.org/10.1007/BF02719429