Utilization of hydrogen during coal liquefaction
The patterns of hydrogen utilization are determined for a number of different coal conversion conditions. The total uptake of hydrogen is divided into the four categories of gas make, heteroatom removal, change in aromaticity, and cleavage or formation of matrix bonds. Liquefaction temperature strongly influences the extent of hydrogenation of aromatic carbon. Even under significant hydrogen pressure, hydroaromatic compounds underwent net dehydrogenation at temperatures above 400/sup 0/C. A system comprising water, carbon monoxide, and a basic catalyst was able to hydrogenate coal at 350/sup 0/C to a greater degrees than hydrogen under the same conditions with or without ammonium molybdate added as catalyst. Kinetic experiments with conventional liquefaction feed slurries indicate that tetrahydrofuran and cyclohexane conversions increase with time under low-severity conditions. There is a parallel increase in hydrogen incorporated to break matrix bonds, but the amount incorporated to liberate heteroatoms does not correlate strongly with conversion. 6 refs., 2 figs.
- Research Organization:
- USDOE Pittsburgh Energy Technology Center, PA
- OSTI ID:
- 5951667
- Report Number(s):
- CONF-8605306-1; ON: DE87013703
- Resource Relation:
- Conference: EPRI conference, San Francisco, CA, USA, 6 May 1986; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATALYSTS
COMPARATIVE EVALUATIONS
COAL
HYDROGENATION
COAL LIQUEFACTION
CHEMISTRY
AROMATICS
CARBON MONOXIDE
CHEMICAL BONDS
CHEMICAL REACTION KINETICS
CLEAVAGE
CONSUMPTION RATES
DEHYDROGENATION
HETEROCYCLIC COMPOUNDS
HYDROGEN
HYDROGEN TRANSFER
REMOVAL
STEAM
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
CARBON COMPOUNDS
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
KINETICS
LIQUEFACTION
MATERIALS
MICROSTRUCTURE
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction