Comparison of naturally occurring shale bitumen asphaltene and retorted shale oil asphaltene
Asphaltene is ubiquitously present in both the natural occurring bitumen and the retorted shale oil. Very few cases for the comparison of asphaltene properties are available in the literature. In this research, a comparison of the shale bitumen asphaltene and the retorted shale oil asphaltene was undertaken to investigate structural changes during thermal cracking. This was accomplished by means of elemental chemical analysis, infrared spectra, proton nmr spectra, and carbon-13 spectra of the bitumen asphaltenes and asphaltenes derived from shale oil retorted at 425 and 500/sup 0/C. Elemental analysis indicated that asphaltenes derived from retorted shale oils have smaller H/C ratio and smaller oxygen and sulfur contents, but greater nitrogen content than that derived from shale bitumen. Infrared spectra revealed that the retorted shale oil asphaltenes have greater pyrrolic N-H and hydrogen bonded O-H or N-H absorption than the shale bitumen asphaltene. Retorted shale oil asphaltenes have relatively higher aromaticity, lower degree of substitution of the aromatic sheet, and shorter alkyl substituents, which indicated that the main reactions in the retorting process are carbon-carbon bond fission and intramolecular aromatization.
- Research Organization:
- Univ. of Southern California, Los Angeles
- OSTI ID:
- 6750583
- Report Number(s):
- CONF-800814-P2
- Journal Information:
- Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States), Vol. 25:3; Conference: 180. American Chemical Society meeting/2. chemical congress of the North American Continent, Las Vegas, NV, USA, 24 Aug 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ASPHALTENES
ORIGIN
QUANTITATIVE CHEMICAL ANALYSIS
AROMATICS
ASHES
BITUMENS
CARBON
CHEMICAL COMPOSITION
CHEMICAL SHIFT
COMPARATIVE EVALUATIONS
HIGH TEMPERATURE
HYDROGEN
INFRARED SPECTRA
NITROGEN
NMR SPECTRA
OIL SHALES
OXYGEN
RETORTING
SHALE OIL
SOLVENT EXTRACTION
SPECTROSCOPY
SULFUR
ASPHALTS
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
EXTRACTION
FOSSIL FUELS
FUELS
MATERIALS
MINERAL OILS
NONMETALS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
RESIDUES
SEPARATION PROCESSES
SPECTRA
TAR
040500* - Oil Shales & Tar Sands- Properties & Composition