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Chemistry and structure of coal-derived asphaltenes : phase III

Author: Teh Fu Yen; United States. Department of Energy.; University of Southern California.
Publisher: Washington, DC : United States Government Printing Office, 1978.
Series: Fossil energy, FE-2031-10.
Edition/Format:   Print book : National government publication : English
Database:WorldCat
Summary:
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:  Read more...
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Additional Physical Format: Online version:
Yen, Teh Fu, 1927-2010.
Chemistry and structure of coal-derived asphaltenes.
[Washington] : Dept. of Energy ; Springfield, Va. : For sale by the National Technical Information Service, 1977-
(OCoLC)892807784
Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Teh Fu Yen; United States. Department of Energy.; University of Southern California.
OCLC Number: 4095090
Notes: On cover: Fossil energy.
Description: 42 pages : illustrations ; 28 cm
Series Title: Fossil energy, FE-2031-10.
Responsibility: T.F. Yen ; University of Southern California.

Abstract:

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.

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