Effect of water on liquefaction reactivity of low rank coals
Coals fed to direct liquefaction processes are crushed and dried prior to liquefaction. Drying the coal allows a decrease in the total pressure in the process vessels by eliminating the diluting effect of steam on hydrogen partial pressure. Drying can be accomplished using hot combustion gases, nitrogen, air or recycle solvent. Although bituminous coals are effectively converted to pyridine-soluble liquid products by the integrated Two Stage Liquefaction Process (ITSL), recent work at Lummus Crest, Inc., and Kerr-McGee, Inc. suggested that subbituminous coal may be less reactive than bituminous coal. This difference in reactivity may be the result of detrimental thermal reactions taking place between the organic molecules in coal and or the result of loss of water during drying. Work performed at the Gulf Research and Developemnt Corp. indicated that Belle Ayr subbituminous coal loses reactivity, as measured by conversion to pyridine-soluble liquids, as a result of drying. This result was found to be independent of the drying procedure. Although the work at Gulf was limited to drying coal under gaseous atmospheres, work performed at the Battelle Columbus Laboratories has shown that drying of Wyodak subbituminous coal in hot solvent-coal slurry also results in reduced liquefaction reactivity, as measured by conversion to a tetrahydrofuran (THF)-soluble liquid. THF and pyridine are essentially equivalent solvents for coal liquids.
- Research Organization:
- Dept. of Chemical Engineering, Univ. of Wyoming, Laramie, WY
- OSTI ID:
- 6761232
- Report Number(s):
- CONF-860911-
- Journal Information:
- Am. Chem. Soc., Div. Pet. Chem., Gen. Pap., Prepr.; (United States), Journal Name: Am. Chem. Soc., Div. Pet. Chem., Gen. Pap., Prepr.; (United States) Vol. 31:3; ISSN ACPGA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010300 -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ACTIVATION ENERGY
AZINES
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COAL LIQUEFACTION
COAL LIQUIDS
COAL PREPARATION
COMPARATIVE EVALUATIONS
DEHYDRATION
DRYING
ENERGY
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGENATION
KINETICS
LIGNITE
LIQUEFACTION
LIQUIDS
MATERIALS
MOISTURE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PRODUCTION
PYRIDINE
PYRIDINES
REACTION KINETICS
SOLUBILITY
SUBBITUMINOUS COAL
THERMOCHEMICAL PROCESSES
TSL PROCESS
WATER