Modified Redlich-Kwong equation for H/sub 2/O, CO/sub 2/, and H/sub 2/O-CO/sub 2/ mixtures at elevated pressures and temperatures

Journal Article · Mon Jun 01 04:00:00 EDT 1981 · Am. J. Sci.; (United States)

DOI:https://doi.org/10.2475/ajs.281.6.735· OSTI ID:5331261

Kerrick, D M; Jacobs, G K

Carnahan and Starling's hard-sphere Redlich-Kwong equation was modified to include an attractive term (A) that is a function of pressure and temperatures. The modified equation is superior to those that assume (a) to be independent of pressure. Calculated molar volumes and fugacity coefficients for H/sub 2/O and CO/sub 2/ are in good agreement with those obtained from p-v-t data. Furthermore, this equation yields reasonably accurate fugacities for H/sub 2/O and CO/sub 2/ at p-t conditions beyond the range of experimental volumetric measurements. Using standard mixing rules for calculating a(mix) and b(mix), this equation yields z(mix) values that are consistent with those of Greenwood's p-v-t measurements. Calculated activities show significant positive nonideality of mixing at elevated pressures (p > 1 kbar and t= 400 to 800 C). Unmixing of H/sub 2/O and CO/sub 2/ is implied at lower temperatures (400 C) and at higher pressures (p > 10 kbar). 50 references.

• OSTI ID: 5331261
• Journal Information: Am. J. Sci.; (United States), Journal Name: Am. J. Sci.; (United States) Vol. 281:6; ISSN AJSCA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
BINARY MIXTURES
CALCULATION METHODS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON DIOXIDE INJECTION
CARBON OXIDES
CHALCOGENIDES
DISPERSIONS
ENGINEERING
EQUATIONS
FLUID INJECTION
HYDROGEN COMPOUNDS
MISCIBLE-PHASE DISPLACEMENT
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
RESERVOIR ENGINEERING
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
VAPOR PRESSURE
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