The molecular structure of Athabasca asphaltene. Cleavage of the carbon-sulfur bonds by radical ion electron transfer reactions

Ignasiak, T.; Kemp-Jones, A. V.; Strausz, O. P.

doi:10.1021/jo00422a031

Cited by 165 publications

(67 citation statements)

References 1 publication

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“…A wide range of values, though, have been determined (MW Ϸ 600-300 000) depending on the solvent, temperature, and experimental technique [2,47,48]. Many studies yield MW Ͻ 6000 amu, such as number average values of 1800, 2648, 3000, and 3600 amu for AOSA [37,[48][49][50]. Linear correlation analyses, based on the inverse cube-root proportionality D / 1/(MW) 1/3 , for many molecules [43,46,51] 3 , using V x (ellipsoid) 67 600 Å 3 for ovalbumin [45], gives n Ϸ 15-250 for 6-11 wt% AOSA.…”

Section: Self-diffusion Coefficient Measurementsmentioning

confidence: 99%

The low temperature oxidation of Athabasca oil sand asphaltene observed from 13C, 19F, and pulsed field gradient spin-echo proton n.m.r. spectra

Desando

Lahajnar

Ripmeester

et al. 1999

Fuel

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The low temperature oxidation of Athabasca oil sand asphaltene observed from 13C, 19F and pulsed field gradient spin-echo proton n.m.r. spectra Desando, Michael A.; Lahajnar, Gojmir; Ripmeester, John A.; Zupancic, Ivan AbstractCarbon-13 and fluorine-19 nuclear magnetic resonance spectra of chemically derivatized, by phase transfer methylation and trifluoroacetylation, Athabasca oil sand asphaltene, reveal a broad site distribution of different types of hydroxyl-containing functional groups, viz., carboxylic acids, phenols, and alcohols. The low temperature air oxidation of asphaltene, at ca. 130ЊC for 3 days, generates a few additional carboxyl and phenolic groups. These results are consistent with a mechanism in which diaryl methylene and ether moieties react with oxygen. Self-diffusion coefficients, from the pulsed field gradient spin-echo proton magnetic resonance technique, suggest that low temperature oxidation does not appreciably alter the average particle size and diffusion properties of asphaltene in deuterochloroform. ᭧

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Section: Self-diffusion Coefficient Measurementsmentioning

confidence: 99%

The low temperature oxidation of Athabasca oil sand asphaltene observed from 13C, 19F, and pulsed field gradient spin-echo proton n.m.r. spectra

Desando

Lahajnar

Ripmeester

et al. 1999

Fuel

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“…However, the possibility of releasing aliphatic moieties, which are covalently bound to the aromatic rings of the asphaltene fractions of such oils, has helped in bridging this gap [3][4][5][6]. Asphaltene is the general name given to high molecular weight pentane insoluble fraction of bitumen or liquid petroleum [7]. Various physical techniques have provided a broad insight into the exact structure of asphaltene as composed of a complex mixture of polyaromatic molecules of various chain lengths [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Asphaltene is the general name given to high molecular weight pentane insoluble fraction of bitumen or liquid petroleum [7]. Various physical techniques have provided a broad insight into the exact structure of asphaltene as composed of a complex mixture of polyaromatic molecules of various chain lengths [7][8][9]. Also abundant within the asphaltene structures are the aliphatic hydrocarbons, which are covalently bound to the aromatic rings [10,11].…”

Section: Introductionmentioning

confidence: 99%

Geochemical characterisation of heavily biodegraded tar sand bitumens by catalytic hydropyrolysis

Sonibare

Snape

Meredith

et al. 2009

Journal of Analytical and Applied Pyrolysis

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“…26 This proposed mechanism is based on the theory that considers asphaltenes and resins as a colloidal system in petroleum fluids. [27][28][29][30] On the other side, the solubility theory of asphaltenes has also gained attention. 31,32 The formation damage in the reservoirs and plugging of transportation pipes which cause significant drops in pressure are the main concern for both petroleum and chemical engineers working in the oil industry.…”

Section: Introductionmentioning

confidence: 99%

Effects of Native and Non-Native Resins on Asphaltene Deposition and the Change of Surface Topography at Different Pressures: An Experimental Investigation

2015

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Asphaltene deposition during oil production and transportation causes extensive damage to reservoirs and wellhead equipment. In this study, the effects of native and non-native resins as well as their mixtures on the asphaltene deposition process are investigated. A novel pressure, volume, and temperature (PVT) visual cell is used to check the effect of resin on asphaltene deposition at different pressures and reservoir temperatures. Two Iranian crude oil samples with different potential of asphaltene deposition (low and high) were used in these tests. During depressurizing in the presence of native and non-native resins, the amount of asphaltene deposited was measured. To monitor any changes in surface topography, the atomic force microscopy (AFM) technique was used in this study. The results show that the amount of asphaltene deposited decreases as the amount of resin increases; however, less asphaltene is deposited when the resin mixture is used than when the native resin is used. At high ratios of resin to asphaltene, the stability of asphaltene is higher, but as the pressure increases, the stability of the asphaltene decreases more than expected. The surface property changes indicate that, in the presence of the resin mixture, the surfaces are less affected.

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The molecular structure of Athabasca asphaltene. Cleavage of the carbon-sulfur bonds by radical ion electron transfer reactions

Cited by 165 publications

References 1 publication

The low temperature oxidation of Athabasca oil sand asphaltene observed from 13C, 19F, and pulsed field gradient spin-echo proton n.m.r. spectra

The low temperature oxidation of Athabasca oil sand asphaltene observed from 13C, 19F, and pulsed field gradient spin-echo proton n.m.r. spectra

Geochemical characterisation of heavily biodegraded tar sand bitumens by catalytic hydropyrolysis

Effects of Native and Non-Native Resins on Asphaltene Deposition and the Change of Surface Topography at Different Pressures: An Experimental Investigation

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