Fluid ammonia is highly associated because of strong intermolecular hydrogen bonding. This causes different behavior of thermophysical properties from nonpolar fluids, as reflected, for example, in the heat capacity. In this work, a new equation of state explicit in the Helmholtz energy with independent variables of temperature and density was developed, which includes a new associating term. Its uncertainties in density, vapor pressure, saturated liquid and vapor densities, and caloric properties were estimated by comparisons with experimental data. The new equation of state is valid from the triple-point temperature (195.49 K) to 725 K at pressures up to 1000 MPa and densities up to 53.13 mol dm−3. Physically correct behavior within the region of validity and at extremely high temperatures and pressures, and at temperatures far below the triple-point temperature, was obtained by applying constraints on various properties. The unique physical behavior of ammonia shown in some thermodynamic properties is described in detail, which will provide a preliminary template for developing equations of state for other associating fluids.
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March 2023
Research Article|
February 15 2023
A Reference Equation of State with an Associating Term for the Thermodynamic Properties of Ammonia
Kehui Gao (高克慧)
;
Kehui Gao (高克慧)
1
MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University
, Xi’an, Shaanxi 710049, People’s Republic of China
2
Applied Chemicals and Materials Division, National Institute of Standards and Technology
, 325 Broadway, Boulder, Colorado 80305, USA
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Jiangtao Wu (吴江涛)
;
Jiangtao Wu (吴江涛)
1
MOE Key Laboratory of Thermo-Fluid Science and Engineering, Xi’an Jiaotong University
, Xi’an, Shaanxi 710049, People’s Republic of China
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Ian H. Bell
;
Ian H. Bell
2
Applied Chemicals and Materials Division, National Institute of Standards and Technology
, 325 Broadway, Boulder, Colorado 80305, USA
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Allan H. Harvey
;
Allan H. Harvey
a)
2
Applied Chemicals and Materials Division, National Institute of Standards and Technology
, 325 Broadway, Boulder, Colorado 80305, USA
a)Author to whom correspondence should be addressed: [email protected]
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Eric W. Lemmon
Eric W. Lemmon
a)
2
Applied Chemicals and Materials Division, National Institute of Standards and Technology
, 325 Broadway, Boulder, Colorado 80305, USA
a)Author to whom correspondence should be addressed: [email protected]
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a)Author to whom correspondence should be addressed: [email protected]
J. Phys. Chem. Ref. Data 52, 013102 (2023)
Article history
Received:
September 27 2022
Accepted:
January 07 2023
Citation
Kehui Gao, Jiangtao Wu, Ian H. Bell, Allan H. Harvey, Eric W. Lemmon; A Reference Equation of State with an Associating Term for the Thermodynamic Properties of Ammonia. J. Phys. Chem. Ref. Data 1 March 2023; 52 (1): 013102. https://doi.org/10.1063/5.0128269
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