Extraction of Hydrocarbons from Bitumen and Bitumen-containing Process and Process Waste Streams using Supercritical Carbon Dioxide

  • Author / Creator
    Cossey, Heidi
  • Extractions of hydrocarbons from bitumen and bitumen-containing process and process waste streams generated from surface mined oil sands were conducted using supercritical carbon dioxide (SC-CO2). Dynamic extractions were performed on a bench-scale batch supercritical fluid extraction (SFE) system at a SC-CO2 density of 0.78 g/mL. Initial dynamic extractions of bitumen tested the effects of two modifiers, toluene and methanol, at concentrations of 5, 10 and 15 mol% in SC-CO2 on the extraction efficiency and the type of hydrocarbons extracted. Toluene extracted a higher, heavier mass percentage of hydrocarbons than an equivalent molar or mass concentration of methanol or SC-CO2 alone. The condition of 15 mol% toluene in SC-CO2 resulted in the highest extraction efficiency of 75.9 wt% and was then tested on the bitumen-containing process and process waste streams. At 15 mol% in SC-CO2, toluene was capable of extracting 72.3 and 68.6 wt% of the hydrocarbons from the process and process waste streams, respectively. Dynamic extractions of process and process waste streams indicated that the presence of water can have a slightly positive effect on the extraction of hydrocarbons, and the presence of solids does not substantially impact the extraction.

  • Subjects / Keywords
  • Graduation date
    Spring 2019
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
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