Separation of tailings that include asphaltenes

Details Separation of tailings that include asphaltenes Separation of tailings that include asphaltenes

C - Chemistry, Metallurgy

10

G

C10G 1/04 (2006.01)

Patent

CA 2711705

Various systems and methods are described that can be used as part of a process to separate bitumen from oil sands. The process may include adding a hydrocarbon solvent to a bitumen containing extract. The tailings from this process may contain a significant amount of solvent. The solvent may be recovered from the tailings with a tailings solvent recovery unit that utilizes negative pressure to significantly reduce the cost of the process in comparison to a conventional steam stripping unit. In one embodiment, the tailings may also separated prior to entering the tailings solvent recovery unit with a gravity separation apparatus or a cyclonic separation apparatus, such as a hydrocyclone.

L'invention porte sur différents systèmes et méthodes utilisables en tant que parties de procédés de séparation du bitume d'avec les sables pétrolifères, pouvant consister à ajouter un solvant d'hydrocarbure à un extrait contenant du bitume. Les produits de queue ainsi obtenus peuvent contenir une quantité significative de solvant que l'on peut récupérer à l'aide d'une unité ad hoc utilisant une pression négative pour réduire significativement le coût du processus par comparaison aux unité classiques de stripage à la vapeur. Dans une exécution, les produits de queue peuvent être séparés avant l'introduction de l'unité de récupération du solvant au moyen d'un appareil de séparation par gravité ou d'un appareil à séparation cyclonique tel qu'un hydrocyclone.

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