Abstract
The phase behavior of Athabasca bitumen (Alberta, Canada) was determined from nanofiltered permeates and retentates with pentane-asphaltene mass fractions wA ranging from 0.053 to 0.57, and chemically separated Athabasca pentane maltenes and pentane asphaltenes based on differential scanning calorimetry and rheology measurements from (190 to 570) K at atmospheric pressure. Samples were subject to two sequential heating cycles. Composition, apparent heat-capacity, and phase-angle data were collected and interpreted jointly to define phase diagrams for nanofiltered maltene + nanofiltered asphaltene pseudobinary mixtures for each heating cycle. These pseudocomponents are shown to behave independently. During the first heating cycle, observed phase transitions for maltenes include: a broad low-temperature glass transition with a Tg from (215 to 230) K and a small first-order phase transition with a peak temperature Ttrs between (320 and 340) K linked to a fraction of Athabasca maltenes undergoing a crystal to...
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