Devolatilization equilibria in H/sub 2/O-CO/sub 2/ and H/sub 2/O-CO/sub 2/-NaCl fluids: an experimental and thermodynamic evaluation at elevated pressures and temperatures
Experimental equilibrium brackets have been obtained in H/sub 2/O-CO/sub 2/ and H/sub 2/O-CO/sub 2/-NaCl fluids for several decarbonation equilibria. Using available thermodynamic data and activities for H/sub 2/O and CO/sub 2/ calculated from the modified hard-sphere Redlich-Kwong (HSMRK) equation of Kerrick and Jacobs (1981), thermodynamic extrapolations in P-T-X/sub CO/sub 2// space of devolatilization equilibria yield close agreement with the experimental equilibrium brackets, implying that the experimental and thermodynamic data are internally consistent, and that the activities of H/sub 2/O and CO/sub 2/ predicted by the HSMRK equation of Kerrick and Jacobs (1981) are quite reasonable. The significance of assuming ideal vs. non-ideal mixing of H/sub 2/O and CO/sub 2/ for the calculation of T-X/sub CO/sub 2// topologies is demonstrated for a portion of the system CaO-Al/sub 2/O/sub 3/-SiO/sub 2/-H/sub 2/O-CO/sub 2/. Experiments in H/sub 2/O-CO/sub 2/-NaCl mixtures at P=6 kbar show that, compared to binary H/sub 2/O-CO/sub 2/ fluids, the presence of small (5-10 wt.%) amounts of NaCl in the fluid phase significantly increase the activity of CO/sub 2/ for H/sub 2/O-rich compositions. At 2 kbar, however, little difference in the activity of CO/sub 2/ in H/sub 2/O-CO/sub 2/-NaCl vs. H/sub 2/O-CO/sub 2/ mixtures is implied by the experiments.
- Research Organization:
- Pennsylvania State Univ., University Park
- OSTI ID:
- 5442468
- Journal Information:
- Am. Mineral.; (United States), Vol. 66:11-12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GEOTHERMAL FLUIDS
DEVOLATILIZATION
EQUILIBRIUM
CARBON DIOXIDE
EVALUATION
EXPERIMENTAL DATA
FLUIDS
GEOCHEMISTRY
SODIUM CHLORIDES
THERMODYNAMIC PROPERTIES
WATER
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
DATA
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SODIUM COMPOUNDS
580400* - Geochemistry- (-1989)