QI-free coal tar pitch is separated into a toluene-soluble (TS) and a toluene-insoluble (TI) fraction by solvent extraction. The effect of controlled mixing of both fractions on mesophase formation is studied. The formation of mesophase is correlated with the carbon and hydrogen contents of the samp
Mesophase formation in coal liquid solvent fractions
โ Scribed by Victoria A. Weinberg; Teh Fu Yen
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 639 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0008-6223
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โฆ Synopsis
The single greatest influence on the mesophase microstructure is the chemical composition of the organic precursor. The effects of oxygen content and structural parameters of precursors from solvent fractions of coal liquefaction products on the microstructure and pyrolysis yields were determined. The fractions were analysed using the Brown-Ladner method to obtain average molecular structural parameters. It was found that pyrolysis vield increases with increased aromaticitv and oxygen content and that mesophase microstructure is determined primarily by the oxygen content of the precursors.--
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