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/sup 13/C-N. M. R. studies of a flash pyrolysis tar and a supercritical gas extract using modern pulse sequences

Journal Article · · Liq. Fuels Technol.; (United States)
;
The oil and the asphaltene obtained from a flash pyrolysis tar of an Australian sub-bituminous coal and the oil and asphaltene from a supercritical gas extract of an Australian bituminous coal were studied by /sup 13/C-N.M.R. spectroscopy using modern pulse sequences which distinguish between primary (CH/sub 3/), secondary (CH/sub 2/), tertiary (CH) and quaternary (C) carbons. The oil from the flash pyrolysis tar was further separated into three fractions by elution chromatography and these were also studied. All the samples studied contained considerable amounts of long unsubstituted aliphatic chains. In the flash pyrolysis tar, a sizeable proportion of the long chains had a CH=CH/sub 2/ end group pertaining to both 1-alkenes and those chains attached to aromatic rings (..omega..-aryl-1-alkenes), but this was much less in the supercritical gas extract. From the quaternary and tertiary carbon subspectra, it appears that the division of the aromatic carbon signal at 129-130 ppm between aromatic CH and C carbons is not valid for polar fractions of coal liquids. Though these pulse sequences are very useful for obtaining information on well resolved signals, broad featureless signals often found in coal liquids pose considerable problems.
Research Organization:
CSIRO Division of Applied Organic Chemistry, Melbourne
OSTI ID:
6429091
Journal Information:
Liq. Fuels Technol.; (United States), Journal Name: Liq. Fuels Technol.; (United States) Vol. 2:1; ISSN LFTED
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010406 -- Coal & Coal Products-- Pyrolysis & Cracking-- (-1987)
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ALKANES
ALKENES
ASPHALTENES
ASPHALTS
BITUMENS
BITUMINOUS COAL
BLACK COAL
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL LIQUEFACTION
COAL TAR
COAL TAR OILS
DECOMPOSITION
ENERGY SOURCES
EVEN-ODD NUCLEI
EXTRACTION
FLASH HEATING
FOSSIL FUELS
FUELS
HEATING
HYDROCARBONS
ISOTOPES
LIGHT NUCLEI
LIQUEFACTION
MAGNETIC RESONANCE
MATERIALS
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PULSE TECHNIQUES
PYROLYSIS
RESONANCE
SEPARATION PROCESSES
SPECTRA
STABLE ISOTOPES
SUBBITUMINOUS COAL
SUPERCRITICAL GAS EXTRACTION
TAR
THERMOCHEMICAL PROCESSES