Chemistry and structure of coal-derived asphaltenes, Phase III. Quarterly progress report, July--September 1977
The major benzene insoluble fraction, carboid, solvent-separated from Synthoil coal liquid, was found to be 90 wt.% soluble in pyridine. This fraction, which contains about 50% of the ash present in Synthoil coal liquid, could be 96% de-ashed by dissolution in pyridine. A hypothetical average structure for Synthoil asphaltene has been derived from analytical, VPO MW, x-ray, NMR and chemical functionality data. A self-association model has been developed for calculating molecular weights, and fractions of monomeric, dimeric and trimeric asphaltene species present as a function of concentration in benzene solution. ESR measurements of Lande g-values and spin intensities have been made for coal liquid solvent fractions and asphaltene derived products. The observed g-values fall within the narrow range (2.0028 to 2.0036) previously reported for asphaltic fractions of petroleum and neutral radicals. TGA measurements of coal liquid fractions have been carried out, and % char values determined. Synthoil asphaltene has been found to undergo oxygen induced reactions which stabilize it toward volatilization vis-a-vis the Synthoil carboid fraction. Silylation studies on carboid coal-liquid fractions afforded % OH/Q/sub total/ values: Synthoil, 47; HRI H-Coal, 64; FMC-COED, 52; Catalytic Inc., 36; PAMCO, 53. Methylation studies of Synthoil asphaltene, with methyl iodide, indicate that about 67% of the asphaltene nitrogen is non-basic, and that about 33% of the nitrogen in molecules containing basic nitrogen is non-basic.
- Research Organization:
- University of Southern California, Los Angeles (USA)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- OSTI ID:
- 5258694
- Report Number(s):
- FE-2031-9
- Country of Publication:
- United States
- Language:
- English
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Determination of nitrogen and oxygen functional groups in coal-derived asphaltenes
Chemistry and structure of coal-derived asphaltenes, Phase III. Quarterly progress report, October--December 1977
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010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
010407 -- Coal & Coal Products-- Solvent Extraction-- (-1987)
010600 -- Coal
Lignite
& Peat-- Properties & Composition
AROMATICS
ASPHALTENES
ASPHALTS
AZINES
BENZENE
BITUMENS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL LIQUEFACTION
COAL LIQUIDS
COED PROCESS
COHERENT SCATTERING
DEASHING
DIFFRACTION
ELECTRON SPIN RESONANCE
EXTRACTION
FRACTIONATION
GRAVIMETRIC ANALYSIS
H-COAL PROCESS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
LIQUEFACTION
MAGNETIC RESONANCE
METHYLATION
MOLECULAR WEIGHT
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PYRIDINE
PYRIDINES
QUANTITATIVE CHEMICAL ANALYSIS
RESONANCE
SCATTERING
SEPARATION PROCESSES
SOLVENT EXTRACTION
STRUCTURAL CHEMICAL ANALYSIS
SYNTHOIL PROCESS
TAR
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION