Method for obtaining bitumen from tar sands

Details Method for obtaining bitumen from tar sands Method for obtaining bitumen from tar sands

C - Chemistry, Metallurgy

10

G

C10G 1/04 (2006.01) B01D 11/04 (2006.01) B01J 8/00 (2006.01)

Patent

CA 2582078

A method and a system for obtaining bitumen from tar sand (10) are disclosed. The disclosed method can include two extraction steps, such as a first extraction step (20) using a light aromatic solvent (15) and a second extraction step (75) using a volatile hydrocarbon solvent (60). The light aromatic solvent (15) and the volatile hydrocarbon solvent (60) both can be recycled (45) and (90) and used in multiple extractions. Each extraction and recycling step can include a separation (35) and (80). The disclosed system can include separators (35) and (80) configured to perform these separations. Some of these separators also can function as mixers. Using the disclosed method and system, it is possible to achieve a high degree of bitumen recovery (40) and (85) while minimizing undesirable complications, such as swelling of clays in the tar sand and/or precipitation of asphaltenes.

Procédé de production de bitume à partir de sables bitumineux. Le procédé peut comprendre deux étapes d'extraction, telles qu'une première étape d'extraction utilisant un solvant aromatique léger et une seconde étape d'extraction utilisant un solvant à base d'hydrocarbures volatil. Le solvant aromatique léger et le solvant à base d'hydrocarbures volatil peuvent tous deux être recyclés et utilisés dans de multiples extractions. Chaque étape d'extraction et de recyclage peut comprendre une séparation. Le système de l'invention peut comprendre des séparateurs configurés pour effectuer ces séparations. Certains de ces séparateurs peuvent aussi fonctionner comme des mélangeurs. Les procédé et système de l'invention permettent de réaliser un degré élevé de récupération de bitume tout en réduisant au minimum les complications indésirables, telles que le gonflement des argiles dans le sable bitumineux et/ou la précipitation des asphaltènes.

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