Email RIS file
Bookmark
Report an Issue

Chemistry and structure of coal-derived asphaltenes. Phase II. Quarterly progress report, April--June 1977 [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1977.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 48 : digital, PDF file
Additional Creators
University of Southern California, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online

Availability

I Want It
I Want It

Finding items...

Restrictions on Access
Free-to-read Unrestricted online access
Summary
Separation of coal asphaltenes by solvent elution chromatography with benzene, diethyl ether, and tetrahydrofuran, on silica gel, may be carried out to obtain distinct fractions with 98 to 99 percent recovery of starting asphaltene. The diethyl ether eluted fraction is found to be more basic and polar, to have a higher degree of saturation, and to contain smaller average aromatic ..pi..-systems than the benzene eluted asphaltene fraction. The third fraction (THF-eluted) has the highest molecular weights, and the largest percentages of nitrogen and oxygen. Donor-acceptor complexes between coal asphaltenes and the ..pi..-acceptor tetracyanoethylene have been synthesized. UV-visible spectra of these species show new charge-transfer absorption bands not found in the free components. Electron spin resonance measurements show enhanced spin signals for these complexes. X-ray diffraction measurements indicate solid state clusters of asphaltene/TCNE in the range of /sup 3///sub 2/ to /sup 4///sub 2/. Electron spin resonance spectra of asphaltenes, asphaltene chromatography fractions, and asphaltene charge transfer complexes afford relative ESR signal intensity values consistent with a picture of donor-acceptor properties holding alternate layers together.
Report Numbers
E 1.99:fe-2031-8
fe-2031-8
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
10/01/1977.
"fe-2031-8"
Miller, J.; Kwan, J.; Wong, M.; Schwager, I.; Lee, W. C.; Yen, T. F.; Farmanian, P.; Lew, R.; Louie, M.
Funding Information
EX-76-C-01-2031
View MARC record | catkey: 13844436