Tar sands extraction process

Details Tar sands extraction process Tar sands extraction process

C - Chemistry, Metallurgy

10

G

196/28

C10G 1/04 (2006.01) C10G 1/00 (2006.01)

Patent

CA 1063054

ABSTRACT OF THE DISCLOSURE This invention relates to a process for the extraction of bitumen from tar sands which comprises contacting the tar sand in an extraction zone with a paraffinic hydrocarbon solvent having from S to 9 carbon atoms at a ratio of from 2 to 10 parts solvent per part of tar sand, maintaining the asphaltene fraction of said tar sands in suspension, separating a major portion of said solvent which contains a major amount of the bitumen dissolved therein along with the suspended asphaltene fraction from the extracted sand, passing the extracted sand along with a minor portion of said solvent and a minor amount of bitumen into a water contacting zone and therein contacting said extracted sand with sufficient water at a temperature of at least 50°C to separate substantially all of said minor amount of bitumen and said minor portion of solvent from said sand, separating said major solvent portion from the suspended alphaltenes and distilling said solvent from said major solvent portion to recover said major amount of bitumen. In a preferred embodiment, the extract from the water contacting zone is centrifuged to separate fines and water from the bitumen and solvent, said minor amount of bitumen is removed from the solvent, e.g., by distillation and may be burned to provide heat for the process.

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