A study of depolymerization and crosslinking reactions in coal liquefaction: Ninth quarterly report, September 1, 1987-November 30, 1987
The major goal of this program is to characterize the depolymerization and crosslinking reactions of low rank coals and determine how they can be optimized in liquefaction by combining high heating rates with solvent interctions. High heating rates are achieved by using a heated tube reactor where coal is heated at about 20,000/sup degree/Csec. Solvent interactions to stabilize depolymerization fragments formed at high heating rates are achieved by: (1) co-injection of a donor solvent into the heated tube reactor;(2) preswelling the coal at elevated temperatures (100)degree)C) and pyrolyzing the swelled coal in the heated grid or heated tube reactors and (3) injecting rapidly preheated coal into a hot solvent. The solvent used for swelling experiments was pyridine which disrupts hydrogen bonds and therefore results in maximum swelling. Chlorobenzene is unable to disrupt these hydrogen bond and so produces less swelling. Chlorobenzene was used in some of the swelling experiments to compare the swelling behavior of chars in these two solvents. The swelling due to chlorobenzene for coal and chars formed under a variety of pyrolysis conditions was found to be lower than that due to pyridine. This is because chlorobenzene is unable to disrupt the hydrogen bonds like the pyridine does. For lignite chars, swelling is low with chlorobenzene due to early crosslinking. For bituminous coal chars, swelling due to chlorobenzene could be higher than the parent coal under conditions where hydrogen bonds have been disrupted due to pyrolysis but not many new crosslinks have been introduced due to crosslinking. 10 refs., 3 figs., 2 tabs.
- Research Organization:
- Advanced Fuel Research, Inc., East Hartford, CT (USA)
- DOE Contract Number:
- FG22-85PC80910
- OSTI ID:
- 5330774
- Report Number(s):
- DOE/PC/80910-T2; ON: DE88007643
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
A study of depolymerization and crosslinking reactions in coal liquefaction: Seventh quarterly report for the period March 1, 1987 to May 31, 1987
A study of depolymerization and crosslinking reactions in coal liquefaction: Tenth quarterly report, December 1, 1987-February 28, 1988
Related Subjects
CHARS
SWELLING
COAL
CHEMICAL REACTIONS
DEPOLYMERIZATION
COAL LIQUEFACTION
HEATING RATE
ORGANIC SOLVENTS
BITUMINOUS COAL
CATALYTIC EFFECTS
CHEMICAL BONDS
CLEAVAGE
CROSS-LINKING
DEMINERALIZATION
FOURIER TRANSFORMATION
INFRARED SPECTRA
LIGNITE
MINERALS
PROGRESS REPORT
PYRIDINE
AZINES
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
CRYSTAL STRUCTURE
DECOMPOSITION
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
HETEROCYCLIC COMPOUNDS
INTEGRAL TRANSFORMATIONS
LIQUEFACTION
MATERIALS
MICROSTRUCTURE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
POLYMERIZATION
PYRIDINES
PYROLYSIS PRODUCTS
SEPARATION PROCESSES
SOLVENTS
SPECTRA
THERMOCHEMICAL PROCESSES
TRANSFORMATIONS
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction