Correlation of coal hydroliquefaction rate with coal properties

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6382945

Shin, S C

The direct hydroliquefaction reactivities for a suite of 5 bituminous coals from the Argonne Premium Coal Sample Bank were studied in a tubing micro-reactor system. Solvent effects for 3 different aromatic vehicles (1-methylnaphthalene, naphthalene, phenanthrene) and effects of hydrogen source on liquefaction (hydrogen-donor solvent vs. molecular hydrogen) were examined for basic screening purposes. No chemical effect for the aromatic solvents tested was observed, and liquefaction in 1-methylnaphthalene (1-MN) was found to be equivalent to liquefaction in naphthalene or phenanthrene. Molecular hydrogen was found to function as a hydrogen source for radical capping, but was found to function more slowly under conditions where the primary radicals were produced by thermal pyrolysis. Molecular hydrogen was also found to have the ability to cleave bonds that were not thermally broken. The results of a model compound (dibenzyl) study were confirmed by actual coal experiments, and the aliphatic hydrogen content of the coal was found to be one of the most important coal properties in determining the sensitivity of the hydroliquefaction reaction to molecular hydrogen. Activation energies were obtained by applying a reversible kinetic model to the rate data for the 5 bituminous coals, and strong correlations of the activation energies for formation of toluene and THF solubles were found with total oxygen and aliphatic hydrogen content respectively. These results clearly seem to substantiate the hypothesis that coal has a cross-linked, and three-dimensional structure and that the cross-links are mainly composed of ethylene and etheric bridges.

• Research Organization: Colorado School of Mines, Golden (USA)
• OSTI ID: 6382945
• 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
ACTIVATION ENERGY
ALKANES
ALKYLATED AROMATICS
AROMATICS
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CHEMICAL PROPERTIES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CLEAVAGE
COAL
COAL LIQUEFACTION
COAL LIQUIDS
CONDENSED AROMATICS
CORRELATIONS
CROSS-LINKING
CRYSTAL STRUCTURE
CYCLOALKANES
ELEMENTS
ENERGY
ENERGY SOURCES
EQUATIONS
EXTRACTION
FLUIDS
FOSSIL FUELS
FUELS
FURANS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGEN
HYDROGEN TRANSFER
KINETIC EQUATIONS
KINETICS
LIQUEFACTION
LIQUIDS
MATERIALS
MICROSTRUCTURE
MOLECULAR STRUCTURE
NAPHTHALENE
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHENANTHRENE
POLYMERIZATION
REACTION KINETICS
SEPARATION PROCESSES
SOLUBILITY
SOLVENT EXTRACTION
TEMPERATURE EFFECTS
TETRAHYDROFURAN
THERMOCHEMICAL PROCESSES
TOLUENE