Distribution of Pendant Alkyl Groups in the Argonne Premium Coals
| Autor: | Leon M. Stock, Marcus Obeng and |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Bituminous coal
chemistry.chemical_classification Chemistry General Chemical Engineering geology.rock_type technology industry and agriculture geology Energy Engineering and Power Technology chemistry.chemical_element complex mixtures Medicinal chemistry Redox Ruthenium chemistry.chemical_compound Fuel Technology Lignin Organic chemistry Carbon Alkyl Methyl group |
| Zdroj: | Energy & Fuels. 10:988-995 |
| ISSN: | 1520-5029 0887-0624 |
| Popis: | The ruthenium(VIII) oxidation reaction has been employed to determine the distribution of alkyl groups that are bonded to aromatic structural elements in lignin and the Argonne Premium Coals. The lignin, as expected, has few aromatic methyl groups, 0.02 per 100 carbon atoms. The results for the coals, Beulah-Zap 0.86, Wyodak 1.16, Illinois No. 6 1.76, Blind Canyon 2.45, Pittsburgh No. 8 2.05, Lewiston-Stockton 2.39, Upper Freeport 2.09, and Pocahontas No. 3 7.28 methyl groups per 100 carbon atoms, exhibit a steeply stepped discontinuous rank dependence. The abundances of the other small alkyl groups, which are least prevalent in the lignin and the low-rank coals, range from about 0.2 ethyl and 0.05 propyl groups to about 0.01 butyl groups per 100 carbon atoms in the bituminous coals. The curious rank dependence for the methyl group abundances may be the consequence of major structural changes that accompany the transformation of a medium-volatile bituminous coal into a low-volatile bituminous coal. The ch... |
| Databáze: | OpenAIRE |
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