Oxidation of Roading Asphalts

Herrington, P R; Patrick, John; Ball, G.F.A.

doi:10.1021/ie00035a033

“…spectrum of AOSA containing carbon-13 only at the natural isotopic abundance of 1.1% (Figs 1 and 5). Therefore, although ketones and sulfoxides are known oxidation products of asphaltic substances [28,30,31], they are not readily detected in the 13 C n.m.r. spectrum of AOSA when present in small quantities.…”

Section: Carbon-13 and Fluorine-19 Nmr Spectroscopymentioning

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

¹

,

Lahajnar

²

,

Ripmeester

³

et al. 1999

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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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“…Alkyl sulfoxides, for instance, pyrolyze into olefins and unstable sulfenic acid. This phenomenon is supported by the observation that the rate of increase of sulfoxide concentration upon oxidation of asphalts at 60, 100, and 130ЊC is greatest at low temperatures [30]. The degree of oxidation is dependent, in part, on the methodology (e.g.…”

mentioning

confidence: 78%

“…spectrum of AOSA containing carbon-13 only at the natural isotopic abundance of 1.1% (Figs 1 and 5). Therefore, although ketones and sulfoxides are known oxidation products of asphaltic substances [28,30,31], they are not readily detected in the 13 C n.m.r. spectrum of AOSA when present in small quantities.…”

mentioning

confidence: 99%

99/02454 The low temperature oxidation of Athabasca oil sand asphaltene observed from 13C, 19F, and pulsed field gradient spin-echo proton n.m.r. spectra

1999

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0

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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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“…The carbonyl and sulfoxide formation are indicators for the degree of oxidation which result in an associated increase in viscosity (log of viscosity) [14,15]. A change in these functional groups can be characterized using FTIR spectroscopy.…”

Section: Fourier Transformed Infrared (Ftir) Spectroscopymentioning

confidence: 99%