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Initial Solubility Measurements of Bitumen Cuts in Supercritical Carbon Dioxide

  • Author / Creator
    Yu, Edmund H
  • Initial solubilities for whole bitumen and bitumen cuts of light gas oil (LGO), heavy gas oil (HGO), and vacuum residue (resid) were measured in supercritical carbon dioxide (SC-CO2) and SC-CO2 modified with 5 or 15 mol% toluene. The initial solubility measurements were performed on a bench-scale batch supercritical fluid extraction (SFE) system at 333 K and 24 MPa (SC-CO2 density of 0.78 g/mL). LGO had the highest average initial solubility in SC-CO2 at 8.7 x 10-2 g/g, followed by whole bitumen at 1.3 x 10-2 g/g, HGO at 1.1 x 10-2 g/g, and resid at 5.9 x 10-4 g/g. When SC-CO2 was modified with 5 mol% toluene, HGO had the highest average initial solubility at 4.5 x 10-2 g/g, followed by whole bitumen at 3.5 x 10-2 g/g, and resid at 5.6 x 10-2 g/g; the initial solubility for LGO could not be reliably measured. When SC-CO2 was modified with 15 mol% toluene, whole bitumen measured the highest average initial solubility at 1.1 x 10-1 g/g, followed by resid at 2.4 x 10-2 g/g. The initial solubility of LGO was not measured at the 15 mol% toluene condition and the initial solubility for HGO could not be reliably measured. HTSD analysis of the extracts from the initial solubility measurements indicated that heavier hydrocarbons were dissolved in the SC-CO2 with the addition of toluene as a modifier.

  • Subjects / Keywords
  • Graduation date
    Fall 2021
  • Type of Item
    Thesis
  • Degree
    Master of Science
  • DOI
    https://doi.org/10.7939/r3-b8bn-9a04
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.