Volumetric properties of CO[sub 2]-CH[sub 4]-N[sub 2] fluids at 200[degrees]C and 1000 bars: A comparison of equations of state and experimental data
- Oak Ridge National Laboratory, TN (United States)
- Virginia Institute and State Univ., Blacksburg, VA (United States)
Predictions of molar volume, excess molar volume, and isochoric P-T trajectories from thirteen published equations of state are compared with one another and with preliminary volumetric data for CO[sub 2]-CH[sub 4]-N[sub 2] fluids at 200[degrees]C and 1000 bars. The equations of state investigated represent a wide variety of empirical and semi- empirical approaches to the modeling of fluids. The experimental data indicate that excess volumes of CO[sub 2]-CH[sub 4]-N[sub 2] mixtures are small (<3% of the total volume of the mixture, except near the critical point of CO[sub 2]). The NIST software package DDMIX yields volumetric properties that are most consistent with experimental results. Differences in the calculated volumetric properties of mixtures from the different equations of state are significant. For example, estimates of the equilibrium trapping temperature of a fluid inclusion (2000 bars, 60% CO[sub 2]-20% CH[sub 4]-20% N[sub 2] mixture, V = 59.10 cm[sup 3]/mol) calculated from various equations of state range from 462-570[degrees]C. The major source of error in calculated volumetric properties of fluid mixtures is the inability of equations of state to accurately predict the volumetric properties of the pure components.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7243114
- Journal Information:
- Geochimica et Cosmochimica Acta; (United States), Vol. 58:3; ISSN 0016-7037
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON DIOXIDE
EQUATIONS OF STATE
MIXING
VOLUME
METHANE
NITROGEN
ALKANES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ELEMENTS
EQUATIONS
HYDROCARBONS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
400201* - Chemical & Physicochemical Properties