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Oxidation of coal-derived asphaltenes with thallium(III)

✍ Scribed by Jeffrey Solash; Jeffrey Northrup; Jack C. Burnett; Robert N. Hazlett

Publisher: Elsevier Science
Year: 1984
Tongue: English
Weight: 534 KB
Volume: 63
Category: Article
ISSN: 0016-2361
DOI: 10.1016/0016-2361(84)90040-1

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✦ Synopsis

Coal-derived asphaltenes are complex aggregate organic materials. The high viscosity of asphaltenes has been attributed to organic (pyridine) base-organic (phenols) acid interaction. Reduction of asphaltene viscosity by selectively oxidizing with thallium(lll) salts was attempted. TI(III) treatment of Solvent Refined Coal (SIX) asphaltenes, derived from a Western Kentucky coal, resulted in smoothly converting ~66% of the phenolic compounds to quinones. Reduced viscosity of this product fraction was found. Of the remaining phenolic compounds x33% gave higher MW compounds with much higher viscosity. A model compound experiment using 2,6-dimethyl phenol and 2,6-lutidine shows that steric effects are important in the TI(I II) oxidation of phenols. Possible reaction pathways are discussed.

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