Alkali recycle process for recovery of heavy oils and bitumens

Details Alkali recycle process for recovery of heavy oils and bitumens Alkali recycle process for recovery of heavy oils and bitumens

C - Chemistry, Metallurgy

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C10G 33/04 (2006.01) B01D 17/04 (2006.01) C10G 1/04 (2006.01)

Patent

CA 1129801

22 ABSTRACT OF THE DISCLOSURE Heavy oils, including oil sands, are recovered from mined or in-situ formation by a novel procedure which involves an initial emulsification of the oil with aqueous alkali, usually sodium hydroxide solution, at a pH above about 11. After separation of any residual solid phase, such as sand, the resulting oil-in-water emulsion is inverted by the use of slaked lime to form a water-in-oil emulsion and thereby re- generating part of the sodium hydroxide solution. The water- in-oil emulsion is dewatered to recover the oil phase while the aqueous phase is recycled to the initial emulsification, after removal of clay particles when oil sands are treated.

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