Optical monitoring of the oxidation of methane in supercritical water
Conference
·
OSTI ID:10173809
Supercritical water oxidation is an emerging technology being developed by many laboratories and industries for the treatment of hazardous wastes. It is appropriate for the destruction of a wide variety of waste streams composed of up to 20% organics in water. Experiments were conducted in a static, high-pressure reactor to investigate the oxidation of methane in supercritical water. Pressures ranged from 138 to 275 bar, temperatures from 380 to 440{degrees}C, and equivalence ratios from 0.2 to 2.0 for initial methane concentrations around 0.1 mole/l. In these experiments, Raman spectroscopy was used as an in-situ diagnostic to monitor the concentrations of methane, oxygen, and carbon dioxide. Over this pressure range the reaction rate of methane with oxygen is unexpectedly observed to decrease with increasing pressure. A non-linear least squares fit was performed to determine four global reaction rate parameters. In contrast to results from experiments at lower initial methane concentrations, the reaction order dependency on methane is found here to be greater than unity. This finding implies that the former results cannot safely extrapolate to concentrations around 0.1 mole/l.
- Research Organization:
- Sandia National Labs., Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Department of Defense, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 10173809
- Report Number(s):
- SAND--94-8606C; WSS/CI--94-008; CONF-940397--4; ON: DE94016615
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
052001
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
HAZARDOUS MATERIALS
INDUSTRIAL WASTE MANAGEMENT
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RAMAN SPECTROSCOPY
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12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
HAZARDOUS MATERIALS
INDUSTRIAL WASTE MANAGEMENT
METHANE
OXIDATION
RAMAN SPECTROSCOPY
SUPERCRITICAL STATE
WASTE PROCESSING
WATER