A Semi-Empirical Excess Pressure Equation for CO{sub 2}-H{sub 2}O fluids at 400 C, 0--400 MPa

Conference · Sun Sep 12 00:00:00 EDT 1999

OSTI ID:751601

Blencoe, J G; Anovitz, L M; Singh, J

Highly accurate and precise density data for CO{sub 2}-H{sub 2}O mixtures at 400 C 10-400 MPa, were used to develop a modified, B-truncated virial equation for excess pressure (P{sup ex}). This function and empirical equations of state for H{sub 2}O and CO{sub 2} accurately represent the experimentally determined densities, and interpolate smoothly between data points. Integrating the P{sub ex} expression with respect to molar volume yields an equation for excess Helmholta free energy, which can be used to calculate other excess properties of interest. The P{sup ex} modeling method has important advantages over more conventional, alternative approaches.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (US)
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 751601
• Report Number(s): ORNL/CP-105949; TRN: AH200037%%98
• Resource Relation: Conference: 13th International Conference on the Properties of Water and Steam, Toronto, Ontario (CA), 09/12/1999--09/16/1999; Other Information: PBD: 12 Sep 1999
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON DIOXIDE
EQUATIONS OF STATE
FREE ENERGY
MIXTURES
STEAM
VIRIAL EQUATION
WATER VAPOR
DENSITY
DENSITY MEASUREMENT