Relation of coal characteristics to liquefaction behavior. Final technical report, July 1976 to February 1981. Part III. Mechanistic studies, product distributions and supportive analytical investigations
In this report, a number of mechanistic aspects of liquefaction are addressed that may be dependent on coal characteristics, then product composition is considered, and after that various supportive studies of an analytical character and reported. Finally, some statistical correlations are considered that permit some degree of prediction of the distillability of products from the characteristics of the coal used as feedstock. Correlations between coal characteristics and liquefaction conversion in tetralin are somewhat perturbed when the reactor system is pressurized with hydrogen, apparently because additional mass transport limitations become significant and the severity of these varies from coal to coal. Different specimens of pyrite isolated from coals promote liquefaction to differing extends when added to low-sulfur coals. A new kinetic model for coal liquefaction recognizes that many components are reacting simultaneously and shows that the effective temperature coefficient varies with the extent of conversion in the early stages of the process. The interaction of hydrocarbon solvents with coals turns out to be an unexpectedly complex phenomenon, and it is still not known how donor solvent rapidly penetrates coal particles under liquefaction conditions, as it is commonly assumed to do. However, there are indications that imbibition is operative. Consistently with this, hydrocarbons cause some swelling of lower rank coals. Hexane-soluble oils from a number of coals have been partially separated into compound types by desorption chromatography or HPLC, and the fractions have been analyzed by GC/MS. Petrographic examination of the residues from liquefaction shows that a number of phenomena related to the coking process take place during liquefaction, and their incidence varies with rank. (DMC)
- Research Organization:
- Pennsylvania State Univ., University Park (USA). Coal Research Section
- DOE Contract Number:
- AC22-76ET10587
- OSTI ID:
- 6567128
- Report Number(s):
- DOE/ET/10587-T1-Pt.3; FE-2494-FR-3; ON: DE83004597
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
CHEMICAL COMPOSITION
COAL LIQUEFACTION
CHEMICAL REACTION KINETICS
COAL LIQUIDS
CHEMICAL REACTIONS
COAL RANK
EXPERIMENTAL DATA
LIQUID COLUMN CHROMATOGRAPHY
MASS SPECTROSCOPY
PETROGRAPHY
POROSITY
PYRITE
RESIDUES
TETRALIN
AROMATICS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHROMATOGRAPHY
DATA
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
HYDROCARBONS
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
KINETICS
LIQUEFACTION
LIQUIDS
MATERIALS
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
REACTION KINETICS
SEPARATION PROCESSES
SPECTROSCOPY
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction
010600 - Coal
Lignite
& Peat- Properties & Composition