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Impacts of initial reaction chemistry on direct coal liquefaction processes

Conference ·
OSTI ID:6674985
; ;
The initial reactions that occur during liquefaction can have significant impacts on process yields and downstream process conditions. Reactions that result in compounds with low molecular weights and decreased boiling points are beneficial, whereas retrogressive reactions, which yield higher molecular weight compounds that are refractory to further processing, give lower yields of desired products. The objectives of this research are to determine the process conditions that give rise to retrogressive reactions during preconversion processing and to identify methods for minimizing the occurrence of these reactions. Initial studies have been performed using dibenzyl ether as a compound to model ether linkages in coal. Results show that retrogressive reactions can occur at temperatures as low as 180{degree}C. The presence of a good hydrogenation catalyst and a hydrogen donor was found to minimize retrogressive reactions, whereas the presence of mineral matter, primarily clay minerals, and ZnCl{sub 2}, enhanced the reactions. 8 refs., 3 figs.
Research Organization:
Sandia National Labs., Albuquerque, NM (USA)
Sponsoring Organization:
DOE/FE
DOE Contract Number:
AC04-76DP00789
OSTI ID:
6674985
Report Number(s):
SAND-90-2145C; CONF-9010173--1; ON: DE90015780
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COAL LIQUEFACTION
CORRELATIONS
ELEMENTS
ETHERS
HALIDES
HALOGEN COMPOUNDS
HYDROGENATION
IRON COMPOUNDS
IRON SULFIDES
KAOLINITE
LIQUEFACTION
METALS
MINERALS
MOLECULAR WEIGHT
MOLYBDENUM
NICKEL
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PRESSURE EFFECTS
PYRITE
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YIELDS
ZINC CHLORIDES
ZINC COMPOUNDS
ZINC HALIDES