Preconversion processing of bituminous coals: New directions to improved direct catalytic coal liquefaction. [High temperature soaking coal in coal liquids prior to liquefaction]
Soaking coal in coal liquids at 300-400[degrees]C (high-tenperature soaking) has been studied for coal dissolution prior to liquefaction in the previous task. Two high-volatile bituminous coals, Illinois No. 6 and Pittsburgh No. 8, were examined in three different coal liquids. The high-temperature soaking was effective to solubilize more than 70 wt% cf these coals. The mechanism of disintegration of coal by the high-temperature soaking was investigated under various soaking conditions. The products was also analyzed with solvent swelling. These results were rationalized that coal is solubilized primarily by physical disintegration. The derived mechanism was consistent with the new concept of coal structure: A significant portion of coal is physically associated, not three-dimensionally cross-linked. Radically-induced scission reactions were proposed to prorate breakage of coal moleculs by the combination of the high-temperature soaking before liquefaction. In this term, the effect of radical initiators were investigated under the conditions of the high-temperature soaking and liquefaction. Illinois No. 6 coal and a coal liquid derived from the same coal were used. The first section reports the effect of radical initiators on coal disintegration, and the second section reports the effect of a radical initiator on coal liquefaction. Radical initiators had a positive effect on disintegration. However, the effect was highly temperature-dependent and had a negative effect on liquefaction at high tenperatures.
- Research Organization:
- BCR National Lab., Pittsburgh, PA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-91PC91041
- OSTI ID:
- 7150506
- Report Number(s):
- DOE/PC/91041-T4; BCRNL-L-1668; ON: DE93006439
- Country of Publication:
- United States
- Language:
- English
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Preconversion processing of bituminous coals: New directions to improved direct catalytic coal liquefaction
Preconversion processing of bituminous coals: New directions to improved direct catalytic coal liquefaction. Quarterly report, April 1, 1992--June 30, 1992
Related Subjects
BITUMINOUS COAL
DISSOLUTION
COAL LIQUEFACTION
CATALYSIS
COAL LIQUIDS
EXPERIMENTAL DATA
HEAT TREATMENTS
HYDROGEN PEROXIDE
PROGRESS REPORT
RADICALS
RESEARCH PROGRAMS
TEMPERATURE EFFECTS
TETRAHYDROFURAN
TETRALIN
TOLUENE
WATER
ALKYLATED AROMATICS
AROMATICS
BLACK COAL
CARBONACEOUS MATERIALS
COAL
DATA
DOCUMENT TYPES
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
FURANS
HETEROCYCLIC COMPOUNDS
HYDROAROMATICS
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
LIQUEFACTION
LIQUIDS
MATERIALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PEROXIDES
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction