Supercritical Extraction of Tar Sands Bitumen
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Experimental work on supercritical extraction of tar sands bitumen with liquid CO<SUB>2</SUB>, supercritical CO<SUB>2</SUB>, propane, n-pentane and mixtures of with water and steam has been carried out in a high-pressure stainless steel autoclave under continuous flow conditions. Variables studied were pressure, temperature, flow rate, solvent composition and sample size. For extraction with supercritical CO<SUB>2</SUB>, only 22% of the bitumen could be extracted in 60 minutes. Higher recoveries were achieved with propoane and pentane. Supercritical CO<SUB>2</SUB> and steam mixtures yielded 97% recovery of bitumen. Both CO<SUB>2</SUB> and propane resulted in high degree of de-asphalting of the bitumen extract.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 1389-1394, 1998
The Japan Society of High Pressure Science and Technology