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Herrington, Anthony; Herrington, Jan; Sparrow, Len; Oliver, Ron

doi:10.1023/a:1009919417317

Cited by 16 publications

(2 citation statements)

References 12 publications

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“…(Branthaver, 1993b;Ball and Herrington, 1996;Lau et ai, 1992;Petersen et al, 1993a), or thin films (Dickinson et al, 1958;Petersen, 1989), or for bitumens in solution (Knotnerus, 1972;Ronvaux-Van Keerbergen and Thyrion, 1989). The rate of oxidation can be described in terms of two concurrent first order reactions, one rapid and one slow (effectively constant), giving rise to equation (I) (Herrington, 1998;Huh and Robertson, 1996):…”

Section: Effect Of Association On Oxidation Rate Experiments In Decalmentioning

confidence: 99%

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Effect of Inter-Molecular Association on Bitumen Oxidation

Herrington

1999

Petroleum Science and Technology

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The hypothesis that inter-molecular associations between species in petroleum bitumens affects the rate of air oxidation of the bitumens was examined using infrared spectroscopy, gel permeation chromatography and viscosity measurements. Experiments were carried out in which the rate of oxidation of two different bitumens and their fractions (maltenes, resins, asphaltenes) were measured in terms of carbonyl group formation. In THF solution at 30°C the rates of reaction of the maltene and asphaltene fractions were the same when oxidised separately or as a mixture. Although the presence of inter-molecular associations were confirmed by gel permeation chromatography, the results indicated that such effects were unimportant to the rate of the reaction. Further experiments were performed in which neat bitumen, resin and maltene (n-heptane) factors and reconstituted mixtures were 291 oxidised under 2069 kPa of oxygen or air at 40°C or 60°C. Again, no evidence for the effect of inter-molecular association on oxidation rate was obtained. Another experiment in which a bitumen, rejuvenating oil (RO), and a mixture of the two was oxidised (2069 kPa air, 60°C) again showed that the reaction rate of the bitumen and RO were the same when oxidised separately or in the mixture. However, in contrast, the rate of increase of viscosity of the bitumen was significantly affected by the RO and was attributed to dispersal of polar oxidation products by the RO.

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Section: Effect Of Association On Oxidation Rate Experiments In Decalmentioning

confidence: 99%

“…It has also been shown recently that the change of log viscosity as a function of oxidation time can be predicted in terms of the inherent reactivity of the bitumen (Herrington, 1998;Huh and Robertson, 1996), i.e. without need to invoke physico-chemical arguments.…”

Section: Introductionmentioning

confidence: 99%