Reactivity of coal in direct hydrogenation processes: Technical progress report, September-November 1987
Research focused on two facets of the reactivity studies. First, a series of experimental runs aimed at investigation of the role of hydrogen in direct liquefaction were completed. A model compound system consisting of dibenzyl in aromatic (non-donor) or hydroaromatic (hydrogen donor) vehicles was hydrogenated to determine the effect of molecular hydrogen and hydrogen from donor molecules in the radical quenching and bond scission reactions. Special attention was paid to the role of hydrogen as an active bond cleavage agent. These data show the relative participation of hydrogen from both sources at conditions relevant to the reactivity data and provide support for the role of hydrogen acting directly to promote bond cleavage. Maintenance of a ''pool'' of hydrogen atoms was found to be of great importance in terms of promoting hydrogenolysis and hydrocracking reactions of dibenzyl. Five bituminous coals from the Argonne premium coal collection were liquefied at conditions similar to those employed in the model compound study. The general findings relative to the activity of molecular hydrogen determined from the model compound experiments were evidenced in the coal liquefaction data. Additionally, the presence of aliphatic hydrodgen in the coal itself was found to be a highly significant factor in determining the sensitivity of coal conversion to the presence of gas phase molecular hydrogen. 8 refs., 6 figs., 8 tabs.
- Research Organization:
- Colorado School of Mines, Golden (USA). Dept. of Chemical Engineering and Petroleum Refining
- DOE Contract Number:
- FG22-85PC80907
- OSTI ID:
- 5701687
- Report Number(s):
- DOE/PC/80907-T8; ON: DE88005285
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
CHEMICAL REACTION KINETICS
HYDROGENATION
ORGANIC SOLVENTS
DEHYDROGENATION
HYDROGEN TRANSFER
BIBENZYL
BITUMINOUS COAL
CHEMICAL BONDS
CLEAVAGE
HYDROGEN 1
NUCLEAR MAGNETIC RESONANCE
PROGRESS REPORT
PYROLYSIS
RADICALS
STRUCTURAL MODELS
AROMATICS
BLACK COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DECOMPOSITION
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN ISOTOPES
ISOTOPES
KINETICS
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
MICROSTRUCTURE
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
REACTION KINETICS
RESONANCE
SOLVENTS
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES
010600* - Coal
Lignite
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010405 - Coal
Lignite
& Peat- Hydrogenation & Liquefaction