Unit sheet weights of asphalt fractions determined by structural analysis

Haley, Graeme A.

doi:10.1021/ac60311a027

Cited by 38 publications

(16 citation statements)

References 26 publications

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“…Average structural parameters for the various fractions from bitumen pitch were estimated from data provided by 'H NMR, elemental analysis and M n • (Brown and Ladner, 1960;Haley, 1972;Zhao et aI., 1999). These parameters are identified in Table II while the results are summarised in (Suzuki et aI., 1982).…”

Section: Resultsmentioning

confidence: 99%

Molecular Nature of Athabasca Bitumen

Zhao

Kotlyar

Woods

et al. 2000

Petroleum Science and Technology

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Athabasca bitumen is a heavy hydrocarbon recovered from oil sands. During upgrading, bitumen is first distilled to remove lighter components which are processed in hydrotreaters. This distillable portion, heavy gas oil, accumulates nearly 80 w/w% of the saturates present in the original material. The aromatic character and heteroatorns content of the molecules in this fraction increase with the boiling point of the components. The residue from distillation, bitumen pitch, is subjected to thermal cracking followed by hydrotreating.The extractable front fractions from pitch show a trend for increasing aromatic content with a concomitant decrease in HIC atomic ratios. This is a reflection of greater numbers of aromatic rings with a higher degree of condensation and decreasing degree of substitution. The insoluble end-587

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Section: Resultsmentioning

confidence: 99%

Molecular Nature of Athabasca Bitumen

Zhao

Kotlyar

Woods

et al. 2000

Petroleum Science and Technology

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“…Among the other techniques for measuring Mn, if we take industrial constraints into account (cost, measurement time and simplicity), the GPC (or SEC) method has been successfully used in the petroleum industry over the last 20 years [40,41,42,49,83], even though some of the problems of detection, calibration/correction and plugging of the column persist. The rise of SFC in the last 10 years is also to be noted [53] and [58].…”

Section: Part 1 -Various Techniques For Measuring the Molecular Weighmentioning

confidence: 99%

Comparative Ebulliometry: a Simple, Reliable Technique for Accurate Measurement of the Number Average Molecular Weight of Macromolecules. Preliminary Studies on Heavy Crude Fractions

Béhar

Barreau

Vellut

et al. 1998

Rev. Inst. Fr. Pét.

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Este artículo consta de dos partes. En la primera, los autores presentan una comparación entre las principales técnicas de determinación de la masa molar de macromoléculas. Los resultados del estudio bibliográfico figuran reunidos en varias tablas. En la segunda parte, se describe un ebulliómetro comparativo diseñado para la medición de la masa molar de promedio en número (Mn) de las fracciones pesadas de los crudos. Una ilustración de la eficacia de este aparato se indica con el estudio preliminar de residuos de destilación atmosférica y de resinas. Básicamente, existe la posibilidad de obtener la medición de las masas molares que pueden alcanzar 2 000 g/mol, en menos de 4 horas, con una incertidumbre experimental de, aproximadamente, un 2 %.

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“…(g) only one pericondensed aromatic system occurs per molecule. The different subscripts used for various positions of carbon atoms signify (4) the following:…”

Section: Theoreticalmentioning

confidence: 99%

“…Their method provides rigorous relations among the structure parameters but requires data from element analyses, NMR, and infrared (IR) spectroscopy as well as density and molecular weight determinations. The structures of Kuwait and Arabian asphalts were determined by Haley (4) and Dickinson (5). The equations which they proposed, are simpler and easier to apply than those of Hirsch and Altgelt (3).…”

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confidence: 99%