A study of depolymerization and crosslinking reactions in coal liquefaction: Seventh quarterly report for the period March 1, 1987 to May 31, 1987

Technical Report · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6215672

Solomon, P R; Serio, M A; Deshpande, G V

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 interactions. High heating rates are achieved by using a heated tube reactor where coal is heated at about 20,000/sup 0/C/sec. 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/sup 0/C) and pyrolyzing the swelled coal in the heated grid or heated tube reactors and (3) injecting rapidly preheated coal into a hot solvent. Crosslinking and depolymerization reactions are also being studied by using polymers to simulate the chemistry occurring in coal. The polymers poly(2,5 dihydroxy 1,4 p-xylylene), poly(2,6 dimethyl 1,4 phenylene oxide) and carboxylated poly (2,6 dimethyl 1,4 phenylene oxide) were pyrolyzed in the TG-FTIR. The carboxylated polymer showed an earlier weight loss, higher CO/sub 2/ evolution and lower tar and methane evolution than the uncarboxylated polymer. The hydroxyl polymer had a higher H/sub 2/O evolution and lower tar and methane evolution than the uncarboxylated polymer. The chars of Pittsburgh (high ash) bituminous oxidized coal formed in the TG-FTIR were analyzed for crosslink densities by swelling the chars in pyridine. The rate and extent of crosslinking (as measured by the relative change in swelling ratio) correlated very well with the concentration of the carboxyl groups in the coal. 10 refs.

• Research Organization: Advanced Fuel Research, Inc., East Hartford, CT (USA)
• DOE Contract Number: FG22-85PC80910
• OSTI ID: 6215672
• Report Number(s): DOE/PC/80910-7; ON: DE87013438
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
010600 -- Coal
Lignite
& Peat-- Properties & Composition
ACTIVATION ENERGY
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL
COAL LIQUEFACTION
CROSS-LINKING
DECOMPOSITION
DEPOLYMERIZATION
ENERGY
ENERGY SOURCES
FOSSIL FUELS
FOURIER TRANSFORMATION
FUELS
GRAVIMETRIC ANALYSIS
HEATING RATE
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
LIQUEFACTION
MATERIALS
ORGANIC SOLVENTS
POLYMERIZATION
POLYMERS
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
SOLVENTS
SPECTRA
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES
TRANSFORMATIONS