Chemistry and structure of coal-derived asphaltenes, Phase III. Quarterly progress report, October--December 1977
The 100 percent solubility limits for Synthoil coal liquid solvent fractions fall within the range: 9-12 hildebrands for asphaltene, and 10-11 hildebrands for carbene; the carboid was found to be essentially completely dissolved only in pyridine, delta = 10.6 hildebrands. VPO molecular weight studies indicate that association of asphaltenes is a function of solvent polarity. Association increases along the series: benzene greater than chloroform greater than tetrahydrofuran, but infinite dilution number average molecular weight values are in close agreement for any asphaltene in these three solvents. GPC weight average molecular weight values for the asphaltenes obtained from the five demonstration processes under study are found to range from 531--615. Electron spin resonance studies of asphaltenes in solution, and temperature dependence studies of solid asphaltenes, and asphaltene charge transfer complexes with TCNE provided no evidence for charge transfer interactions leading to increased signal intensities. Polarographic analyses of coal liquid solvent fractions provided evidence which suggests larger and more aromatic systems are present along the series: carboid greater than carbene greater than asphaltene greater than resin greater than oil. Silylation and methylation of asphaltene silica gel chromatographic fractions provided data on the percentages of hydroxylic oxygen, and basic nitrogen present in each fraction.
- Research Organization:
- University of Southern California, Los Angeles (USA)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 7177798
- Report Number(s):
- FE-2031-10
- Country of Publication:
- United States
- Language:
- English
Similar Records
Chemistry and structure of coal-derived asphaltenes, Phase III. Quarterly progress report, July--September 1977
Chemistry and structure of coal-derived asphaltenes, Phase III. Quarterly progress report, January--March 1978
Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
010407 -- Coal & Coal Products-- Solvent Extraction-- (-1987)
010600 -- Coal
Lignite
& Peat-- Properties & Composition
ASPHALTENES
ASPHALTS
BITUMENS
CHROMATOGRAPHY
COAL LIQUEFACTION
COAL LIQUIDS
ELECTRON SPIN RESONANCE
EXTRACTION
FRACTIONATION
GAS CHROMATOGRAPHY
LIQUEFACTION
MAGNETIC RESONANCE
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
POLAROGRAPHY
RESONANCE
SEPARATION PROCESSES
SOLVENT EXTRACTION
SYNTHOIL PROCESS
TAR