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

Conference · Mon Jan 01 04:00:00 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
• Conference Information: Journal Name: Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States) Journal Volume: 24:2
• Country of Publication: United States
• Language: English

Related Subjects

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