Characteristics Of Tar Sand Bitumen Asphaltenes As ...

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Characteristics Of Tar Sand Bitumen Asphaltenes As Studied By Conversion Of Bitumen By Hydrolysis

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Cogswell, D. E.
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Bunger, J. W.
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Western Research Institute
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Western Research Institute

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2013-11-07

1979-01-01




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Asphaltenes have been the subject of considerable discussion and controversy in the literature. Controversy and ambiguity arise largely because of the lack of chemical definition of asphaltene mixtures for, which composition is dependent upon the source material and method of isolation. While empirical correlations often exist between increased asphaltene content and increased difficu1ty in processing of feedstocks, the chemical basis of these correlations remains to be demonstrated. It is possible that a cause and effect relationship between molecules comprising the asphaltene fraction and difficulty in processablity does not exist and that these relationships are largely fortuitous in that the chemistry involved in asphaltenes isolation is only secondarily related to chemistry of processing. If such is the case, much of the ambiguity surroundiing asphaltenes derives from the incorrect assumptions about the chemistry of complex hydrocarbon mixtures inferred from empirical correlations. In our present work, we approached the problem of chemistry and definition of asphaltenes with the following hypothesis: a) asphaltenes are not structurally unique from non-asphaltenes; b) average molecular weights for asphaltenes are not appreciably higher than those for non-asphaltenes and strong associative forces account for the inordinately high measured values for asphaltene molecular weights; and c) the in-situ properties of those molecules which would comprise the asphaltenes fraction differ considerably from those manifest when isolated in an asphaltene fraction. To test these hypotheses a tar sand bitumen containing 20 weight percent pentane asphaltenes was characterized and processed by hydropyrolysis before and after ren:oval of asphaltenes. Product yields and structure were determined and the influence- of asphaltenes on results was determined by inferrence. Feedstocks and products were characterized according to elemental analysis, physical properties, simulated distillation and carbon type analysis. Inferrences made in this study are discussed in the context of the reported literature.
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[Is Part Of] Digitized Collection- Western Research Institute, Coal Gasification Collection
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Western Research Institute

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http://hdl.handle.net/10176/wyu:10392