Effect of weathering on solvent extraction of coals
Ambient temperature air oxidation of coal (weathering) is a problem in storage, utilization, and characterization. This work grew out of our observations that toluene insoluble, pyridine soluble (TIPS) fractions of Illinois coals isolated by conventional Soxhlet extraction differed in number average molecular weights, phenol contents, and elemental analyses from the TIPS fractions isolated by the slurry/centrifugation method. Several Soxhlet fraction would not completely redissolve in the extraction solvent and phenol and oxygen contents were unreproducible. The problems have been traced to oxidation during extraction and subsequent work-up, unremoved extraction solvents, and contamination of Soxhlet extracts by colloids.
- Research Organization:
- Chemistry Dept., Eastern Illinois Univ., Charleston, IL 61920
- OSTI ID:
- 6207618
- Report Number(s):
- CONF-870410-
- Journal Information:
- Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States), Vol. 32:1; Conference: 193. national meeting of the American Chemical Society, Denver, CO, USA, 5 Apr 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
OXIDATION
SOLVENT EXTRACTION
WEATHERING
AIR
AMBIENT TEMPERATURE
CENTRIFUGATION
COLLOIDS
FUEL SLURRIES
MOLECULAR WEIGHT
PHENOL
PYRIDINE
SOLUBILITY
SOLVENTS
TOLUENE
ALKYLATED AROMATICS
AROMATICS
AZINES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
DISPERSIONS
ENERGY SOURCES
EXTRACTION
FLUIDS
FOSSIL FUELS
FUELS
GASES
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROXY COMPOUNDS
MATERIALS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHENOLS
PYRIDINES
SEPARATION PROCESSES
SLURRIES
SUSPENSIONS
010600* - Coal
Lignite
& Peat- Properties & Composition
010405 - Coal
Lignite
& Peat- Hydrogenation & Liquefaction