The relationship between chemical structure and reactivity of alberta bitumens and heavy oils

Gray, Murray R.; Jokuty, Paula L.; Yeniova, H.; Nazarewycz, L.; Wanke, Sieghard E.; Achia, Umesh; Krzywicki, A.; Sanford, Emerson C.; Sy, O.

doi:10.1002/cjce.5450690404

Cited by 28 publications

(35 citation statements)

References 23 publications

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“…1(b). Interestingly, the sum of R3, R4 and R5 fraction was similar to amount of real vacuum residue fraction of Athabasca bitumen with about 50 wt%, which has been obtained by standard distillation method in many literatures [10]. In the standard distillation procedure for bitumen, the used sample volume (ca.…”

Section: Resultsmentioning

confidence: 94%

Prediction of bitumen content in oil sand based on FT-IR measurement

Yoon

Son

Lee³

et al. 2009

Journal of Industrial and Engineering Chemistry

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Section: Resultsmentioning

confidence: 94%

Prediction of bitumen content in oil sand based on FT-IR measurement

Yoon

Son

Lee³

et al. 2009

Journal of Industrial and Engineering Chemistry

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“…Processing bitumen extracted from oil sands is challenging due to high viscosity, high density, and high concentration (Table 3) (Gray et al 1991;Gray 2010) which is considerably higher than that of a typical benchmark light crude oil. Reliable data on the oxygen content of Canadian bitumen is more limited, due to difficulty in obtaining reasonable results.…”

Section: Sulfur Compounds In Oilsand-derived Bitumenmentioning

confidence: 99%

Desulfurization of heavy oil

2012

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Strategies for heavy oil desulfurization were evaluated by reviewing desulfurization literature and critically assessing the viability of the various methods for heavy oil. The desulfurization methods including variations thereon that are discussed include hydrodesulfurization, extractive desulfurization, oxidative desulfurization, biodesulfurization and desulfurization through alkylation, chlorinolysis, and by using supercritical water. Few of these methods are viable and/or efficient for the desulfurization of heavy oil. This is mainly due to the properties of the heavy oil, such as high sulfur content, high viscosity, high boiling point, and refractory nature of the sulfur compounds. The approach with the best chance of leading to a breakthrough in desulfurization of heavy oil is autoxidation followed by thermal decomposition of the oxidized heavy oil. There is also scope for synergistically employing autoxidation in combination with biodesulfurization and hydrodesulfurization.

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“…Improvements on the catalyst side require enhancement in heteroatom (N, S, and O) removal and an increase in catalyst stability. Current research efforts use highly sophisticated analytical tools (Vissenberg et al, 2001) and molecular modelling techniques (Gray et al, 1991;Qian, 2001;Tsai et al, 1992) that require a thorough knowledge and understanding of the chemistry of gas oil feedstocks and related hydrotreated products (Par and Yang, 1989;Wimmer, 1991;Ziegler, 1991).…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Gas Oil Fraction and Its Hydrotreated Products

Woods

Kung²,

Adjaye

et al. 2004

Petroleum Science and Technology

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In this work we explore the chemistry of a gas oil fraction in the mid-boiling range (433-483 C) and its products after hydrotreating at 375, 385, and 400 C. Each sample was fractionated by high performance liquid chromatography (HPLC) based on the elution times for saturate, mono-, di-, and poly-aromatic standards. The HPLC saturate fraction is practically free of aromatic components. The nominal mono-and di-aromatics fractions differ in that the former has a higher molecular weight and H/C ratio ORDER REPRINTS cbut lower aromaticity and heteroatom content. The H/C atomic ratios, aromaticities, and average structural parameters of the HPLC poly-aromatic subfractions are virtually the same. Regardless of their structural resemblances they differ substantially in their HPLC elution behavior. This can be attributed to the differences in their oxygen and, especially, nitrogen contents. Hydrogenation produced a significantly greater amount of saturate material having a higher H/C ratio than the original feed. A large part of this increase must result from dealkylation, saturation, or opening of aromatic molecules. This mechanism also produced nominally mono-aromatic compounds from the poly-aromatic species originally present. The effect of hydrogenation on heteroatoms was mixed. While the overall amount of nitrogen was reduced, its concentration in the poly-aromatic fractions actually increased. Overall, oxygen concentration in the product was not much affected by hydrogenation, except that its distribution became skewed towards the more easily eluted HPLC front-fractions. Both thiophenic and sulphide sulphur were significantly reduced in all of the separated fractions.

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The relationship between chemical structure and reactivity of alberta bitumens and heavy oils

Cited by 28 publications

References 23 publications

Prediction of bitumen content in oil sand based on FT-IR measurement

Prediction of bitumen content in oil sand based on FT-IR measurement

Desulfurization of heavy oil

Characterization of a Gas Oil Fraction and Its Hydrotreated Products

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