Extraction of oil from stable oil-water emulsions

Details Extraction of oil from stable oil-water emulsions Extraction of oil from stable oil-water emulsions

C - Chemistry, Metallurgy

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C10G 33/00 (2006.01) B01D 11/04 (2006.01) B01D 12/00 (2006.01) B01D 17/00 (2006.01) B01D 17/04 (2006.01)

Patent

CA 1295279

Title: EXTRACTION OF OIL FROM STABLE OIL-WATER EMUL- SIONS Abstract of the Disclosure The present invention provides a facile method of oil removal from an oil-water emulsion containing suspended solid particulates. In general, the method utilizes a volatile solvent which is liquefied under pressure and forms a two-phase system when in contact with the emulsion. More particularly, the process of the present invention comprises the steps of (A) introducing said emulsion into a vessel in an extraction system, (B) pressurizing the vessel with a volatile hydrocarbon whereby said volatile hydrocarbon is in the liquefied state and forms a two-phase system with said emulsion, (C) maintaining said pressure for a period of time sufficient to effect the replacement of at least some of the oil in the emulsion phase with said volatile hydrocarbon, the replaced oil being dissolved in the volatile hydrocarbon phase, (D) withdrawing at least a portion of said oil-containing hydrocarbon phase while maintaining the pressure on the two-phase system, (E) reducing the pressure on the two-phase system whereby hydrocarbon dissolved in the emulsion is vaporized, and the emulsion separates into a water phase and an oil phase, and (F) recovering the oil phase from the water phase.

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