Journal ArticleDOI
Acid-base structure of coal-derived asphaltenes.
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Asphaltenes, the key intermediates in the liquefaction of bituminous coals, consist of hydrogen bonded complexes which can be separated into their acidic and basic components.Abstract:
Asphaltenes, the key intermediates in the liquefaction of bituminous coals, consist of hydrogen bonded complexes which can be separated into their acidic and basic components. The acidic components contain all, while the basic components contain none, of the exchangeable protons present. The significance of these findings with respect to coal structure and coal solubilization is discussed.read more
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Preparative hydrocarbon group type determination by automated medium pressure liquid chromatography
Journal ArticleDOI
FT-i.r. study of hydrogen bonding in coal☆
TL;DR: In this article, the exact nature of the hydrogen-bonded species present in coal was discussed and band assignments and the importance of hydrogen bonded groups in coal were discussed.
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Evolution of fuel nitrogen in coal devolatilization
TL;DR: In this paper, the distribution of fuel nitrogen in the devolatilization products of a lignite and 12 bituminous coals has been observed experimentally, and the results suggest that coal nitrogen is contained almost entirely in tightly bound rings which are released without breakage in the tar during the initial stage of coal deformation; the remainder is released at higher temperatures when rings are ruptured.
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Fractionation and structural characterization of coal liquids
TL;DR: In this paper, a method of characterizing coal liquids in terms of fractions of different chemical functionality is described, based on Chromatographic fractionation of both benzene-soluble and pyridine-solerant components by sequential elution with specific solvents on silica gel columns.
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Observation of the Type of Hydrogen Bonds in Coal by FTIR
TL;DR: In this article, a method for the clear observation of the types of hydrogen bonds by FTIR was proposed, which involves the evaporation of water in a vacuum chamber with CaF2 windows (vacuum level, 4 × 10-3 kPa).
References
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Journal ArticleDOI
Solubilization of an lvb coal by reductive alkylation
TL;DR: The coal anion is formed by transfer of negative charges from the alkali metal to the aromatic clusters in coal with naphthalene acting as an electron transfer agent as discussed by the authors.
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Proton magnetic resonance studies of hydrogen bonding of benzenethiol with several hydrogen acceptors
TL;DR: In this paper, the effect of temperature on the hydrogen bond formation in CCl/sub 4/ solution was investigated and the results showed that DELTA/sub c/ appears to be independent of temperature.
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Kinetics of Coal Hydrogenation Conversion of Asphalt
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Hydrogen Bonding of Phenol to π Electrons of Aromatics, Polyolefins, Heteroaromatics, Fulvenes, and Azulenes1
Zen-ichi Yoshida,Eiji Osawa +1 more