Chemistry of lignite liquefaction. Quarterly report, July-September 1981
A series of lignite liquefaction samples were isolated into asphaltene and preasphaltene fractions to determine what structural differences are observed in the resulting asphaltenes and preasphaltenes. The solvent refined lignite samples were prepared using H/sub 2/-CO and H/sub 2/ with different degrees of dryness of the starting lignite coal. Quantitative cleavage of dialiphatic ethers with an excess of boron tribromide gave two moles of alkyl bromide, some rearranged. The deficiencies of quantitative anisole and xanthene cleavage with sodium were overcome by using potassium. Quantitative analysis of ketonic carbonyl remains a problem. Studies have continued on N,N-dimethylaniline(I) and related compounds. In the conversion on I into toluene under liquefaction conditions, the methyl group occupies the carbon site formerly occupied by nitrogen as determined by the conversion of o, m- and p-methyl phenyl dimethylamines. The reaction is H/sub 2/S pressure dependent at lower H/sub 2/S concentrations. Tetralin retards the H/sub 2/-induced conversion of I but not the H/sub 2/-H/sub 2/S reaction. The combination of H/sub 2/ and H/sub 2/S is more effective than either alone. The appendix has been entered separately.
- Research Organization:
- North Dakota Univ., Grand Forks (USA)
- DOE Contract Number:
- AB18-78FC02101
- OSTI ID:
- 5384386
- Report Number(s):
- DOE/FC/02101-19; ON: DE82017361
- Country of Publication:
- United States
- Language:
- English
Similar Records
Chemistry of lignite liquefaction. Quarterly report, April-June 1981. [Asphaltenes, preasphaltenes, N,N-dimethylaniline]
Chemistry of lignite liquefaction. Quarterly report for the period January-March, 1982
Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
BROWN COAL
CARBONACEOUS MATERIALS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL BONDS
CHEMICAL REACTIONS
CHEMISTRY
CLEAVAGE
COAL
COAL LIQUEFACTION
COAL LIQUIDS
CRYSTAL STRUCTURE
DENITRIFICATION
ELEMENTS
ENERGY SOURCES
ETHERS
FLUIDS
FOSSIL FUELS
FRACTIONATION
FUELS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
LIGNITE
LIQUEFACTION
LIQUIDS
MATERIALS
MICROSTRUCTURE
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
SEPARATION PROCESSES
STRUCTURAL MODELS
SULFIDES
SULFUR
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES