Isotopic study of the role of a donor solvent in coal liquefaction

Conference · Mon Jan 01 00:00:00 EST 1979 · Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States)

OSTI ID:6085934

Ratto, J J ^[1]; Heredy, L A; Skowronski, R P

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1. Rockwell International, Thousand Oaks, CA

This work examined the donor solvent process during coal liquefaction. A deuterium-labeled donor solvent (tetralin-d/sub 12/) was prepared to study the chemistry of the solvent during liquefaction. In a separate experiment, naphthalene-d/sub 8/ was used to investigate the chemistry of hydrogen transfer between coal and a solvent. In each experiment, the coal products and spent solvent were analyzed for total deuterium content and for deuterium content by structural position. The spent solvent mixture was distilled from the coal products, separated by gas chromatography and analyzed by NMR spectrometry. Tetralin can be hydrogenated to form decalins, dehydrogenated to form naphthalene, or rearranged to form methylindan. The pathway of donation of hydrogen by tetralin requires the abstraction of ..cap alpha..- and ..beta..-hydrogen by coal or gas phase products. Not only hydrogen donation, but also hydrogen exchange via the ..cap alpha..-radical of the tetralin can have a significant role in stabilizing the primary free radical structures which form by thermal decomposition of the coal. The H..cap alpha.. position of naphthalene exchanged more of its deuterium with the coal than the H/sub ..beta../ position. With the use of the deuterium tracer method, deuterium incorporation was found in specific structural positions of the solvent and soluble coal products. 3 figures, 5 tables.

• DOE Contract Number: EF-77-C-01-2781
• OSTI ID: 6085934
• Report Number(s): CONF-790415-P3
• Journal Information: Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States), Vol. 24:2; Conference: 177. national meeting of the American Chemical Society, Honolulu, HI, USA, 1 Apr 1979
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL LIQUEFACTION
HYDROGEN TRANSFER
CHEMISTRY
COAL
DECALIN
DEUTERIUM
GAS CHROMATOGRAPHY
HYDROGEN
ISOTOPIC EXCHANGE
NAPHTHALENE
NUCLEAR MAGNETIC RESONANCE
PYROLYSIS
TETRALIN
TRACER TECHNIQUES
ALKANES
AROMATICS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHROMATOGRAPHY
CONDENSED AROMATICS
CRYOGENIC FLUIDS
CYCLOALKANES
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
HYDROCARBONS
HYDROGEN ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
LIQUEFACTION
MAGNETIC RESONANCE
NONMETALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
RESONANCE
SEPARATION PROCESSES
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction
010600 - Coal
Lignite
& Peat- Properties & Composition