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- W2078288548 abstract "Abstract The acid-catalysed phenol depolymerization of three petroleum asphaltenes has been investigated. Asphaltenes from Cold Lake, Arabian Heavy, and Tia Juana Medium residua were subjected to depolymerization conditions using phenol and para -toluenesulphonic acid, and the products were examined by a variety of instrumental and chemical methods. The treatment resulted in reduced average molecular weights, increased oxygen contents, formation of toluene-insoluble fractions, increased aromatic to aliphatic hydrogen ratios, and increased hydroxyl contents. These observations, when coupled with the finding that silylation resolubilized the toluene-insoluble material, have led to the conclusion that insolubility resulted from phenol incorporation into the asphaltene structure and a concomitant increase in polarity and hydrogen bonding. Since it has been shown in the literature that this treatment can depolymerize coal by breaking the alkyl-aromatic bonds which link aromatic units, the present observations are consistent with the presence in petroleum asphaltenes of condensedring systems linked by alkyl bridges. An additional implication is that the size of the individual condensed-ring systems is smaller than would be the case in the absence of bridging since the resulting molecules are composed of smaller condensed systems linked by aliphatic bridges as opposed to one large condensed unit." @default.
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- W2078288548 date "1978-12-01" @default.
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- W2078288548 title "Chemical depolymerization of petroleum asphaltenes" @default.
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- W2078288548 doi "https://doi.org/10.1016/0016-2361(78)90134-5" @default.
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