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Characterization of asphaltene molecular structures by cracking under hydrogenation conditions and prediction of the viscosity reduction from visbreaking of heavy oils
DownloadSpring 2013
The chemical building blocks that comprise petroleum asphaltenes were determined by cracking samples under conditions that minimized alterations to aromatic and cycloalkyl groups. Hydrogenation conditions that used tetralin as hydrogen-donor solvent, with an iron-based catalyst, allowed...
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Spring 2010
Most crude oils contain traces of vanadyl porphyrins within their asphaltene fraction. Although these metals are only present in trace quantities, they have a significant detrimental impact on crude oil processing units; therefore, their selective removal is highly desirable. The current work...
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Spring 2012
Resolution of reaction pathways to coke formation during the upgrading of heavy resources, such as the vacuum residue fraction of bitumen, is hampered by the extreme complexity of these materials. Alternatively, probing the molecular–level reactions and cracking kinetics of model compounds that...
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Spring 2011
Thin film pyrolysis was used to thermally crack the pendant groups from asphaltene molecules. The cracked products were rapidly quenched to minimize further decomposition. The liquid products were condensed and collected, with over 91% material balance on the recovery of gas, liquid and coke...