Chemistry and structure of coal derived asphaltenes and preasphaltenes. Quarterly progress report, July-September 1981

Technical Report · Thu Jan 01 04:00:00 EST 1981

OSTI ID:5831170

Yen, T F

Coal liquids from Catalytic Incorporated and FMC-COED were separated into oil and resin (pentane soluble), asphaltene (pentane insoluble but benzene soluble) and preasphaltene (benzene insoluble) fractions using Soxhlet extraction. The fractions were analyzed using elemental analyses and the Brown-Ladner method. These fractions were pyrolyzed at atmospheric nitrogen pressure at standard conditions to 500/sup 0/C. The oxygen content and structural parameters of the precursors were compared for solvent fractions of the coal liquids to determine the effects on microstructure and yield is the pyrolysis residues. Pyrolysis yield was found to increase with increased aromaticity and oxygen content. The more aromatic molecules have fewer aliphatic chains to crack off and distill away as gas. The oxygen increases the yield by cross-linking the pyrolysis products and reducing the gas yield. The microstructure is determined primarily by the oxygen content of the precursor. When aromaticity is the same in two precursors, the mesophase growth is suppressed in the material with more oxygen.

• Research Organization: University of Southern California, Los Angeles (USA)
• DOE Contract Number: AC22-75ET10626
• OSTI ID: 5831170
• Report Number(s): DOE/ET/10626-T5; FE-2031-22; ON: DE82002542
• Country of Publication: United States
• Language: English

Related Subjects

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010600* -- Coal
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
AROMATICS
ASPHALTENES
ASPHALTS
BENZENE
BITUMENS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COAL LIQUEFACTION
COAL LIQUIDS
CRYSTAL STRUCTURE
DATA
DECOMPOSITION
EXPERIMENTAL DATA
EXTRACTION
FLUIDS
FRACTIONATION
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
LIQUEFACTION
LIQUIDS
MICROSTRUCTURE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OTHER ORGANIC COMPOUNDS
PENTANE
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
RESEARCH PROGRAMS
RESIDUES
RESINS
SEPARATION PROCESSES
TAR
THERMOCHEMICAL PROCESSES
YIELDS