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 00:00:00 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), Vol. 281:6
• Country of Publication: United States
• Language: English

Related Subjects

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