Microbial conversion of low-rank coal: characterization of biodegraded product
The authors have characterized products obtained from the action of the fungus Polyporus versicolor on oxidized North Dakota (ND) lignite. These analyses showed that, compared to feed coal, the bioconverted materials had higher hydrogen:carbon and oxygen:carbon ratios, but were proportionately lower in aliphatic hydrogen, as determined by infrared (IR) spectroscopy. The acid-precipitated extract was dissolved in dilute base and analyzed by /sup 13/C nuclear magnetic resonance (NMR) spectroscopy. Of the 60% of the carbon accounted for, approximately 51% of the carbon atoms were aromatic, 20% were assigned to carboxylic acid groups, and the remainder were aliphatic carbon. Proton NMR spectra of the acid-precipitated material revealed approximately equal proportions of aromatic and aliphatic hydrogen. The bioconverted materials were highly polar and exhibited a wide range in apparent molecular weight; most material was over 10,000 Da at acidic pH, as determined by ultrafiltration experiments. Freeze-dried product material was soluble in water but was essentially insoluble in other organic solvents. Calorimetric measurements on samples of the freeze-dried extract showed that, on a per-weight basis, it retained 94-97% of the heating value of the feed coal. 12 references, 5 figures, 2 tables.
- Research Organization:
- Battelle, Pacific Northwest Labs., Richland, WA
- OSTI ID:
- 6572397
- Journal Information:
- Energy Fuel; (United States), Vol. 1:1
- Country of Publication:
- United States
- Language:
- English
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COAL EXTRACTS
STRUCTURAL CHEMICAL ANALYSIS
LIGNITE
BIODEGRADATION
CALORIFIC VALUE
CALORIMETRY
CARBON 13
FUNGI
HYDROGEN 1
INFRARED SPECTRA
MOLECULAR WEIGHT
NUCLEAR MAGNETIC RESONANCE
SOLUBILITY
X-RAY FLUORESCENCE ANALYSIS
BROWN COAL
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL
COMBUSTION PROPERTIES
DECOMPOSITION
ENERGY SOURCES
EVEN-ODD NUCLEI
FOSSIL FUELS
FUELS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
NONDESTRUCTIVE ANALYSIS
NUCLEI
ODD-EVEN NUCLEI
PLANTS
RESONANCE
SPECTRA
STABLE ISOTOPES
X-RAY EMISSION ANALYSIS
010600* - Coal
Lignite
& Peat- Properties & Composition
010400 - Coal
Lignite
& Peat- Processing