Chemistry of lignite liquefaction. Quarterly report, April-June 1981. [Asphaltenes, preasphaltenes, N,N-dimethylaniline]
Progress reports are presented for the following four tasks: structural studies of lignite-derived asphaltene and preasphaltenes; ether cleavage studies; studies of denitrogenation caused by CO and water reactions; and electron transfer catalysis studies. Some of the observations are: major differences between asphaltenes and preasphaltenes is that the molecular weight maximizes near 1500 g/mol for the preasphaltenes compared to 400 g/mol for the asphaltenes; asphaltenes have little or no aliphatic or aryl aliphatic ethers whereas preasphaltenes have significant amounts; asphaltenes have major amounts of diaryl ethers and smaller amounts of dibenzofurans while the reverse is true for preasphaltenes; there is a general decrease in diaryl ethers as the temperature of preparation is increased for both the asphaltenes and the preasphaltenes; for asphaltenes a corresponding increase in dibenzofurans is seen but for preasphaltenes these ethers are roughly constant with temperature; lack of cleavage of up to 54% of the ether originally present remains a critical problem; the observed increase in molecular weight particularly with asphaltenes is inconsistent with the model structure and must be examined further; under reducing conditions at liquefaction temperatures, N,N-dimethylaniline gives the products: benzene, toluene, N-methylbenzylamine, N-methylaniline and aniline, H/sub 2/ is superior to CO-H/sub 2/O for the denitrogenation ofN,N-dimethylaniline into benzene; only the combined effect of the additives H/sub 2/S and HCO/sub 2/H can increase the yield of benzene and its reduction products; no electronic effect of the Ni/support catalyst on MgO was noted for hydrogenation, dealkylation, hydrogenolysis, dehydrogenation, except in the case of methanation.
- Research Organization:
- North Dakota Univ., Grand Forks (USA)
- DOE Contract Number:
- AB18-78FC02101
- OSTI ID:
- 6140406
- Report Number(s):
- DOE/FC/02101-18; ON: DE81030178
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
010600 -- Coal
Lignite
& Peat-- Properties & Composition
ACETYLATION
ACYLATION
AMINES
ASPHALTENES
ASPHALTS
BITUMENS
BROWN COAL
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CLEAVAGE
COAL
COAL LIQUEFACTION
COAL LIQUIDS
CRYSTAL STRUCTURE
DENITRIFICATION
ELEMENTS
ENERGY SOURCES
ETHERS
FLUIDS
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
HYDROGENATION
LIGNITE
LIQUEFACTION
LIQUIDS
MAGNETIC RESONANCE
MATERIALS
METALS
METHANATION
MICROSTRUCTURE
MOLECULAR WEIGHT
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NICKEL
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RESEARCH PROGRAMS
RESONANCE
SOLVENT-REFINED COAL
STRUCTURAL CHEMICAL ANALYSIS
TAR
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WATER