Current Research

Alberta produces over 1 million barrels per day of crude oil from the oilsands, but the chemical structure and behaviour of the largest molecules is still poorly understood. Defining the chemical structure, properties and reactivity of these complex molecules is a common theme that links much of my research activity. Unlocking the mystery of these molecules is the key to improved process technologies for the oil sands.

What are asphaltenes?
The most complex molecules in bitumen are found in the asphaltene fraction. Defined by solubility (soluble in toluene and insoluble in n-heptane), this fraction is rich in sulfur, nitrogen and metals. The molecules in this fraction tend to aggregate together, both in the bitumen and at surfaces, making separation and analysis extremely difficult.

Why are asphaltenes important in upgrading of bitumen?
These components are responsible for many of the unwanted problems during upgrading, including the formation of solid coke deposits and deactivation of catalysts

Why are asphaltenes important in extraction?
The aggregated asphaltenes accumulate at both mineral surfaces and oil water interfaces. This modification of the mineral surfaces is important in recovery of bitumen from the oil sands, and in the properties of the clay tailings. Asphaltenes and asphaltene-coated clays at the oil-water interfaces stabilize water in oil emulsions, which are a major problem in extraction and in in situ production.