Effect of thermal hydrocracking on the distribution of compound-types in Athabasca bitumen / A. E. George ... [et al.]. : M38-13/76-32E-PDF

"The changes in the chemical.composition of Athabasca bitumen due to thermal hydrocracking under varying severities of treatment were studied. The main reaction appeared to be the cleavage of saturated hydrocarbon structures from aromatic clusters resulting in large increases in the saturated hydro-carbon fraction as well as decreases in molecular weights. The mononuclear promatic fraction increased very substantially in weight with severity of treatment but the increase in the number of mononuclear aromatic structures was even more marked. The dinuclear aromatic fraction decreased in weight but the number of these structures increased. The polynuclear aromatic and polar fractions decreased markedly in weight but the number of polynuclear aromatic structures changed only slightly. The most severe treatment almost eliminated the asphaltenes and the basic materials. The changes in the sulphur contents of the various fractions were followed and are discussed. Attempts are made to partially explain the conversions during these treatments by thermal hydrogen transfer-aromatization reactions"--Abstract.

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