Mutual Diffusivity of Bitumen and Liquid Hydrocarbons
AdvisorYarranton, Harvey W.
AuthorGrimaldos Aguilar, Franklin Aldemar
Committee MemberKantzas, Apostolos
Moore, Robert Gordon Gord
MetadataShow full item record
AbstractThe objective of this study was to determine the mutual diffusivity for bitumen and maltenes with liquid hydrocarbons at ambient conditions. A new apparatus was designed and commissioned to measure the mass transfer in these systems based on the density profiles established over time in a column of solvent over bitumen. A one dimensional numerical model based on molecular diffusion was developed to determine the mutual diffusivity from the concentration profiles. The model accounted for the dependence of diffusivity on viscosity through a correlation based on the infinite dilution diffusivities of the solvent and the oil. Diffusivities were determined for Athabasca bitumen and maltenes with toluene, n-heptane, and n-pentane at ambient conditions and diffusion times from 3 to 15 days. The model matched the measured concentration profiles to within ±2% for bitumen and ±7% for maltenes. In addition, the effect of asphaltene precipitation of the mass transfer rate was assessed.
Schulich School of Engineering