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Natural oilsands is a complex mixture of sand, clay, bitumen and connate water that can vary markedly from one sample to another. Also, oilsands processability is known to depend on composition and process water chemistry. Because these variables are hard to control, the effect of an individual oilsands component on bitumen recovery is difficult to determine.Here, we carry out a series of systematic...
Compared to benchmark crude oils, bitumen does not respond well to conventional upgrading processes. In order to improve our understanding of this problem, we compare the chemical and physical properties of fractions from super critical fluid extraction of bitumen pitch with the corresponding fractions of residua from Venezuelan heavy oil, a Saudi Arabian light crude and a Chinese Daqing conventional...
As the Canadian supply of light crudes has diminished in recent years, refineries have necessarily been required to deal with difficult to process oilsands bitumens and heavy oils. Bitumen in particular exhibits unique behavior during upgrading; nearly 50% (w/w) of the feedstock is an intractable residuum. The fast catalyst deactivation and high coke forming propensity displayed by this feedstock...
A high water holding capacity of oil sands fine tailing has been attributed to the presence of ultrafine (<0.2 μm) clay fractions. On the basis of hydrophobic character two major types of ultrafines are recognized: biwetted, associated with a significant coverage or organic matter and preferentially hydrophilic solids. The effect of biwetted solids on the colloidal stability of ultrafine clays...
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