Chemical techniques for measuring and controlling the thermodynamic properties of aqueous fluids at high pressures and temperatures

Journal Article · Wed May 01 04:00:00 EDT 1996 · International Journal of Thermophysics

DOI:https://doi.org/10.1007/BF01441508· OSTI ID:471827

Joyce, D B; Blencoe, J G ^[1]

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1. Oak Ridge National Laboratory, TN (United States)

Several chemical techniques have recently been developed for measuring and controlling the fugacities {integral}{sub O2}, {integral}{sub H{sub 2}}, {integral}{sub H{sub 2}}O, and {integral}{sub HC1} in supercritical aqueous fluids. Experimental samples consisting of fluid components and solid chemical {open_quotes}sensors{close_quotes} or {open_quotes}buffers{close_quotes} are sealed in H{sub 2}-permeable noble metal (Pt or Ag-Pd alloy) capsules and reacted at high pressure and temperature. Hydrogen diffusion through the walls of the capsule(s) allows {integral}{sub H2} to be controlled or measured. After quenching, the fluids and solids are analyzed to quantify one or more thermodynamic properties of interest. Methods for determining the activity-composition relations of H{sub 2}O in aqueous fluid mixtures are discussed.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 471827
• Journal Information: International Journal of Thermophysics, Journal Name: International Journal of Thermophysics Journal Issue: 3 Vol. 17; ISSN 0195-928X; ISSN IJTHDY
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
58 GEOSCIENCES
66 PHYSICS
AQUEOUS SOLUTIONS
HIGH PRESSURE
MEASURING INSTRUMENTS
MEASURING METHODS
MIXTURES
PRESSURE DEPENDENCE
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
THERMODYNAMIC PROPERTIES
VOLCANISM