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Pyrolysis of O-methylated Illinois No. 6 coal. Reaction pathways

Journal Article · · Energy Fuel; (United States)
DOI:https://doi.org/10.1021/ef00001a012· OSTI ID:6558282
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Illinois No. 6 coal was modified by selective O-methylation. The O-methyl, O-methyl-d/sub 3/, and O-methyl-/sup 13/C coals were pyrolyzed in a wire-screen reactor at 600-850 C. The char, tar, and gas yields were measured, and the distributions of the isotopic labels in the tar and gaseous products were determined. The product and isotope distributions provide insight concerning the thermal decomposition of the O-methyl coal and the principal reaction pathways of the methyl radicals formed in these reactions. The results for the tar reveal that certain kinds of O-methyl groups are selectively decomposed. Deuterium is incorporated into benzylic and aliphatic positions of the tar. The observations for the gaseous products imply that methyl radicals abstract hydrogen atoms selectively from the coal molecules and thereby initiate an array of other reactions. The work with labeled compounds indicates that the methyl radicals also undergo substitution and addition reactions that lead to low-molecular-weight hydrocarbons and other products. Methoxy radicals also participate in the reactions. Plausible reaction pathways are discussed. 25 references, 2 figures, 8 tables.

Research Organization:
Univ. of Chicago, IL
OSTI ID:
6558282
Journal Information:
Energy Fuel; (United States), Journal Name: Energy Fuel; (United States) Vol. 1:1; ISSN ENFUE
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010409* -- Coal
Lignite
& Peat-- Pyrolysis & Carbonization-- (1987-)
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COAL
COAL GAS
COAL GASIFICATION
COAL LIQUIDS
COAL TAR
DECOMPOSITION
DEUTERIUM
ENERGY SOURCES
EVEN-ODD NUCLEI
FLUIDS
FOSSIL FUELS
FUELS
GASES
GASIFICATION
HYDROGEN ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LIGHT NUCLEI
LIQUIDS
MATERIALS
METHYLATION
NMR SPECTRA
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PYROLYSIS
PYROLYSIS PRODUCTS
REACTION KINETICS
SPECTRA
STABLE ISOTOPES
TAR
THERMOCHEMICAL PROCESSES
TRACER TECHNIQUES
YIELDS