Low-severity coal liquefaction to determine reactivity of coals: Final technical report for the period June 24, 1986-April 23, 1988

Technical Report · Sun May 01 04:00:00 EDT 1988

OSTI ID:6988158

Chung, Kwang E; Heredy, L A

The reactivity of three coals, Illinois No. 6 bituminous, Ohio No. 6 bituminous, Wyoming Canyon-Top subbituminous, with H/sub 2/ has been investigated at high pressure (2700/endash/2900 psig), but mild liquefaction temperatures (300/endash/350/degree/C). Changes in conversion and product distribution as a function of time, temperature, donor solvents and catalysts were determined. The reactivity of dry coal with H/sub 2/ was found to be high at the mild temperatures employed. At 325/degree/C, the conversion of the Illinois coal to gaseous and soluble products increased with reaction time up to 14 h. The reactivity of the Ohio coal was similar to that of the Illinois coal; however, the Wyoming subbituminous coal was much less reactive. With the bituminous coals, the major reactions of the oxygen functional groups at 325/degree/C are with hydrogen if it is sufficiently available at reaction sites. The large difference in reactivity between subbituminous and bituminous coals studied is hypothesized to be due to more extensive retrograde reactions at the sites of oxygen linkages in the subbituminous coal when hydrogenation is not fostered by an effective catalyst. The coal-H/sub 2/ reaction was catalyzed by MoS/sub 2/. In particular, the conversion of Wyoming coal was promoted, increasing three-fold at 325/degree/C and oil yield increased five-fold. Under the same conditions, MoS/sub 2/ increased conversions of the two bituminous coals by 20/percent/ and increased oil yields by 50/percent/. Pyrite, however, was not catalytic at mild temperatures, but instead showed an adverse effect on dry hydrogenation of the bituminous coals, leading to large decreases in conversion and oil yield. Two hydrogen-donor solvents 9.10 dihydrophenanthrene and prehydrogenated fluorathene, known to be effective at higher temperatures also had detrimental effects on the direct hydrogenation of coal when added in a 2:1 ratio. 2 refs., 18 figs., 17 tabs.

• Research Organization: Rockwell International Corp., Thousand Oaks, CA (USA). Science Center
• DOE Contract Number: FG22-86PC90912
• OSTI ID: 6988158
• Report Number(s): DOE/PC/90912-T5; ON: DE88010827
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
AROMATICS
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COAL LIQUEFACTION
COMPARATIVE EVALUATIONS
CONDENSED AROMATICS
DATA
DOCUMENT TYPES
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
HIGH PRESSURE
HIGH TEMPERATURE
HYDROGEN TRANSFER
HYDROGENATION
INFORMATION
LIQUEFACTION
MATERIALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SULFIDES
NUMERICAL DATA
OPTIMIZATION
ORGANIC COMPOUNDS
PROGRESS REPORT
REFRACTORY METAL COMPOUNDS
SOLVENT PROPERTIES
SUBBITUMINOUS COAL
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS