Chemistry and structure of coal-derived asphaltenes, Phase II. Quarterly progress report, January--March 1977. [15 refs]
Separations of Synthoil liquefied coal by solvent fractionation and high pressure liquid chromatography have been compared. Solvent fractionation is believed to give more distinctive fractions. The asphaltene fraction obtained by use of hplc was found to be a mixture of resin, asphaltene, carbene, and carboid. Solvent elution chromatrogrphy of asphaltenes on silica gel has been scaled up, and recoveries of 98-99 wt. % are generally obtained. VPO molecular weight studies of coal asphaltenes, as a function of concentration, in the solvents benzene and THF indicate that association of asphaltenes takes place in both solvents, but is more significant in benzene. Structural parameters obtained from modified Brown-Ladner treatment of proton NMR data suggest that solvent fractions: oil, resin, asphaltene, and carboid have structural characteristics which are sequentially related. X-ray diffraction patterns for asphaltene, carbene, and carboid fractions reveal progressively sharpened (002) and (11) bands indicative of increasing carbonization in this series. Methyl iodide addition to a basic fraction of Synthoil asphaltene (diethyl ether-eluted from silica gel) suggests, in conjunction with infrared results, that essentially all of the nitrogen in this fraction is present in basic pyridine-like compounds.
- Research Organization:
- University of Southern California, Los Angeles (USA)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- OSTI ID:
- 7307605
- Report Number(s):
- FE-2031-7
- Country of Publication:
- United States
- Language:
- English
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Preliminary examination of coal liquefaction products. [12 refs]
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Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
010407 -- Coal & Coal Products-- Solvent Extraction-- (-1987)
010600 -- Coal
Lignite
& Peat-- Properties & Composition
ASPHALTENES
ASPHALTS
AZINES
BITUMENS
CHROMATOGRAPHY
COAL LIQUEFACTION
COAL LIQUIDS
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
DIFFRACTION
EXTRACTION
FRACTIONATION
FUELS
HETEROCYCLIC COMPOUNDS
LIQUEFACTION
MAGNETIC RESONANCE
MOLECULAR WEIGHT
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
OTHER ORGANIC COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
PYRIDINES
RESINS
RESONANCE
SCATTERING
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT-REFINED COAL
STRUCTURAL CHEMICAL ANALYSIS
SYNTHOIL PROCESS
TAR
THERMOCHEMICAL PROCESSES
X-RAY DIFFRACTION