Method for separating bitumen from an oil sand froth

B - Operations – Transporting – 03 – B

Patent

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B03B 9/02 (2006.01) C10G 1/04 (2006.01)

Patent

CA 2521248

A method for separating an oil sand froth comprises: - mixing the oil sand froth with a paraffinic solvent; - inducing the fluid mixture to be separated by gravity separation in the separator into a bitumen enriched, water and solids depleted, upper fluid fraction (C x H y) and a bitumen depleted, water and solids enriched, lower fluid fraction (H2O) ; - inducing the bitumen enriched, water depleted, upper fluid fraction to flow into an upper fluid outlet of the separator and inducing the water enriched, bitumen depleted, lower fluid fraction to flow into to a lower fluid outlet of the separator; and - agitating the fluid mixture with mixing means such that the bitumen depleted, water and solids enriched, lower fluid fraction within the separator comprises a substantially homogeneous mixture of solids and liquids and the formation of layers of highly viscous asphaltene containing material is inhibited.

Méthode permettant de séparer une mousse de sables bitumineux, comportant les étapes suivantes : on mélange la mousse de sables bitumineux avec un solvant paraffinique; on induit la séparation du mélange par gravité, dans le séparateur, afin d'obtenir une fraction liquide riche en bitume, pauvre en eau et en solides, constituant la couche supérieure (CxHy) et une fraction liquide pauvre en bitume, riche en eau et en solides, constituant la couche inférieure (H2O); on force la fraction riche en bitume et pauvre en eau constituant la couche supérieure à s'écouler par une sortie située dans la portion supérieure du séparateur, et la fraction riche en eau et pauvre en bitume constituant la couche inférieure à s'écouler par une sortie dans la portion inférieure du séparateur; on agite le mélange de liquides de manière à ce que la fraction pauvre en bitume, riche en eau et en solides constituant la couche inférieure dans le séparateur forme un mélange principalement homogène de solides et de liquides, et à inhiber la formation de couches de matières renfermant de l'asphaltène hautement visqueuses.

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