Chemistry and structure of coal derived asphaltenes and preasphaltenes. Quarterly progress report, January-March 1981

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

OSTI ID:5839021

Yen, T F

Pyrolysis residues from Catalytic Incorporated and FM-COED asphaltenes were investigated by solvent fractionation to ascertain the reaction mechanism during pyrolysis. The residues were fractionated into oil and resin, asphaltene, preasphaltene and mesophase fractions. Elemental analyses for each fraction were made for the Catalytic Incorporated fractions and for the FMC-COED fractions. When the FMC-COED asphaltene is pyrolyzed, it breaks apart to give a more stable three ring radical which probably condenses to preasphaltene and two smaller molecules which react to form oil and resin and then break down to be evolved as gas. When all the oil and resin is depleted, the remaining preasphaltene molecules continue to form pyridine insoluble chars. When the Catalytic Incorporated asphaltene cracks apart, it forms two stable aromatic molecules which can condense to form preasphaltenes. The general conclusions of this study are: a precursor that can nucleate and grow and coalesce to mesophase is a highly aromatic, condensed material with a few aliphatic or hydroxyl functional groups; the key to mesophase growth appears to be the formation of a preasphaltene intermediate that can condense to form the pre-order and be incorporated into the mesophase so that the mesophase can continue to grow and remain fluid to a higher temperature.

• Research Organization: University of Southern California, Los Angeles (USA)
• DOE Contract Number: AC22-75ET10626
• OSTI ID: 5839021
• Report Number(s): DOE/ET/10626-T3; FE-2031-20; ON: DE82002638
• 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
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ASPHALTENES
ASPHALTS
BITUMENS
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL LIQUEFACTION
COAL LIQUIDS
DATA
DECOMPOSITION
EXPERIMENTAL DATA
EXTRACTION
FLUIDS
FRACTIONATION
INFORMATION
KINETICS
LIQUEFACTION
LIQUIDS
MOLECULAR WEIGHT
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OTHER ORGANIC COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
RESEARCH PROGRAMS
RESIDUES
RESINS
SEPARATION PROCESSES
SOLVENT EXTRACTION
TAR
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES