Exploratory coprocessing research. Quarterly report No. 5 September 1, 1989 to November 30, 1989
The objectives of this project are to: study the scope of hydrothermal pretreatment of coal on subsequent conversion; identify and study the chemical or physical causes of this effect; and attempt to elucidate the chemistry responsible for any coal-resid synergisms. This quarter we designed and constructed a small reactor unit utilizing a shaker assembly designed to use small reaction bombs (approximately 43 mL volume). We expect this unit will provide substantially improved reaction time and temperature control. We have conducted studies on the changes in Argonne Premium samples of Wyodak coal following 30 min treatment in liquid water at autogenous pressures at 150{degree}, 250{degree}, and 350{degree}C. The volatility patterns of the coal tars evolved were recorded using pyrolysis-field ionization mass spectrometry py-FIMS, and in all cases the ultimate tar yields were 25%--30% of the starting coal on a mass basis. There were small changes following the 250{degree} pretreatment, but major effects were seen in the 350{degree} work. Tar quantities remained unchanged, but the volatilities increased substantially. Control runs with no water showed some thermal effect, but the net effect from the presence of liquid water was clearly evident. The 350{degree} treatment brought about a 30% loss of oxygen. The change corresponded to loss of the elements of water, although loss of OH'' seemed to fit the analytical data somewhat better. The water loss takes place both in the presence and in the absence of added water. 8 refs., 2 figs., 1 tab.
- Research Organization:
- SRI International, Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- DOE Contract Number:
- AC22-88PC88802
- OSTI ID:
- 6933608
- Report Number(s):
- DOE/PC/88802-T4; ON: DE90008844
- Country of Publication:
- United States
- Language:
- English
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Hydrothermal pretreatment of coal
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02 PETROLEUM
COAL
COPROCESSING
PETROLEUM RESIDUES
COAL LIQUEFACTION
COAL RANK
DEHYDRATION
PROGRESS REPORT
SOLUBILITY
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TEMPERATURE EFFECTS
WATER
YIELDS
CARBONACEOUS MATERIALS
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
LIQUEFACTION
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