Extraction of bitumen from bitumen froth and biotreatment of...

C - Chemistry – Metallurgy – 10 – G

Patent

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C10G 1/04 (2006.01) C10G 32/00 (2006.01) C12N 1/20 (2006.01)

Patent

CA 2350907

A process for the extraction of bitumen from bitumen froth generated from tar sands is disclosed. In this process, bitumen froth (9) is extracted from tar sands using a water process without requiring the use of caustic soda. The froth is treated in a counter-current decantation circuit with a paraffinic solvent to remove precipitated asphaltenes, water, and solids from the bitumen froth. A dilute bitumen product is produced having a final water and solids contents of about 0.01 to about 1 % by weight (32). This renders the dilute bitumen product amenable to direct hydrocracking. The process advantageously avoids the production of tailings sludges caused by clay dispersions. The present invention also includes a novel process for the biotreatment of bitumen froth tailings (47-52) resulting in a reduced amount of waste products and byproducts.

L'invention concerne un procédé d'extraction de bitume de la mousse de bitume généré par les sables bitumeux. Dans ce procédé, la mousse (9) de bitume est extraite des sables bitumeux grâce à la mise en oeuvre d'un processus à l'eau sans avoir recours au soda caustique. La mousse est traitée dans un circuit de décantation à contre-courant avec un solvant paraffinique de manière à éliminer les asphaltènes précipités, l'eau et les solides dérivés de la mousse de bitume. On obtient un produit de bitume dilué dont la teneur finale en eau et en solides varie entre environ 0, 01 et environ 1 % en poids (32). Ainsi, ce bitume dilué peut être soumis à l'hydrocraquage. Le procédé permet d'éviter, ce qui représente un avantage, la production de boues causées par les dispersions d'argile. L'invention concerne aussi un nouveau procédé permettant le biotraitement des résidus (47-52) de la mousse de bitume qui réduit la quantité des déchets et des sous-produits.

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