| 摘要 |
A method is provided to recover a composition comprising asphaltenes from an oil sand compositions, the method including the steps of: contacting an oil sand composition with water to form a water and oil sand slurry; separating the water and oil sand slurry into a froth comprising mineral solids, water and a hydrocarbon phase, and an underflow stream comprising solids, water, and entrained hydrocarbons; contacting the froth with a sufficient amount of a paraffinic solvent to reach at least partial asphaltene precipitation to form a solvent diluted froth; separating the solvent--diluted froth into a hydrocarbon phase containing a majority of the paraffinic solvent, a majority of the hydrocarbons from the solvent-diluted froth, and a tailings stream containing a majority of solids and a majority of the water present in the froth wherein at least a portion of the asphaltenes from the oil sand are not in the hydrocarbon phase; contacting the tailings stream with a cyclic solvent to form a diluted tailings stream comprising an hydrocarbon phase; and separating at least a portion of the hydrocarbon phase from the diluted tailings stream wherein the hydrocarbon phase is a composition comprising asphaltenes.
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