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Equations of State for the Thermodynamic Properties of Three Isomeric Hexanes: 3-Methylpentane, 2,2-Dimethylbutane, and 2,3-Dimethylbutane

Published

Author(s)

Eric W. Lemmon, Kehui Gao, Jiangtao Wu

Abstract

Equations of state for three isomeric hexanes, 3-methylpentane, 2,2-dimethylbutane, and 2,3- dimethylbutane, have been developed, which are based on experimental thermodynamic property data from the literature. These equations are explicit in the Helmholtz energy, with independent variables of temperature and density. The range of validity for temperatures, pressures, and densities of the equations of state for these three fluids were determined from the available data. The uncertainties in densities, vapor pressures, saturated liquid and vapor densities, and caloric properties were estimated from the available data. The behavior of thermodynamic properties was analyzed to assess the quality of the equations of state, which showed correct behavior within the region of validity, and that the equations can be extrapolated beyond the limits of validity (at high temperatures and pressures, and at temperatures far below the triple point temperature). Key words: 3-methylpentane; 2,2-dimethylbutane; 2,3-dimethylbutane; equation of state; thermodynamic property; Helmholtz energy
Citation
Journal of Physical and Chemical Reference Data
Volume
50

Keywords

3-methylpentane, 2, 2-dimethylbutane, 2, 3-dimethylbutane, equation of state, thermodynamic property, Helmholtz energy

Citation

Lemmon, E. , Gao, K. and Wu, J. (2021), Equations of State for the Thermodynamic Properties of Three Isomeric Hexanes: 3-Methylpentane, 2,2-Dimethylbutane, and 2,3-Dimethylbutane, Journal of Physical and Chemical Reference Data, [online], https://doi.org/10.1063/1.5093644, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=926961 (Accessed May 23, 2022)
Created November 12, 2021, Updated December 16, 2021