Weathering effects on structure and reactivity of US coals: Third quarterly report

Technical Report · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6686878

Meuzelaar, H L.C.; Hill, G R

Three Western coals of different rank (Wyodak lignite, Adaville subbit. and Hiawatha hvBb) and an Interior Province coal (Upper Freeport hvAb) were air oxidized at 100/sup 0/C in fixed bed, (glass walled) reactors to determine the precise mass balance during mild oxidation processes. Oxygen consumption rates and CO/sub 2/ and H/sub 2/O production rates were monitored by gas chromatography (GC) of the reactor effluent gases whereas the weight changes due to weathering were determined by repetitive weighing of the reactors containing the coal samples. To prevent the condensation of water vapor while the effluent gas was flowing through the reactor to the GC column, a heating system between the weathering oven and the GC oven was added. Subsequent GC analysis results of water vapor concentrations proved to be quite reproducible. The initial results of the material balance studies show that the mass balance can not be closed by taking into account O/sub 2/ uptake and CO/sub 2/ and H/sub 2/O losses only. In fact, a variety of volatile organic compounds were found to accompany the flue gas from the reactor, so that a cold trap was installed to trap these organic substances ranging from cyclic sesquiterpenes (Wyojak) and aliphatic hydrocarbons (all coals) to aromatic hydrocarbons (Upper Freeport, Wiawatha) and phenols (Adaville). 4 refs., 15 figs., 2 tabs.

• Research Organization: Utah Univ., Salt Lake City (USA). Biomaterials Profiling Center
• DOE Contract Number: FG22-84PC70798
• OSTI ID: 6686878
• Report Number(s): DOE/PC/70798-T6; ON: DE86015845
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
AIR
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CALORIFIC VALUE
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL
COAL RANK
COMBUSTION PROPERTIES
CONSUMPTION RATES
DATA
DECOMPOSITION
DIAGRAMS
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FLOWSHEETS
FLUIDS
FOSSIL FUELS
FUELS
GAS CHROMATOGRAPHY
GASES
HYDROGEN COMPOUNDS
INFORMATION
LIGNITE
MASS SPECTRA
MATERIAL BALANCE
MATERIALS
MEDIUM TEMPERATURE
NITROGEN
NONMETALS
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PYROLYSIS
RESEARCH PROGRAMS
SEPARATION PROCESSES
SPECTRA
SUBBITUMINOUS COAL
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
WATER
WEATHERING
YIELDS