Method of separating oil or bitumen from surfaces covered...

Details Method of separating oil or bitumen from surfaces covered... Method of separating oil or bitumen from surfaces covered...

C - Chemistry, Metallurgy

10

G

196/25

C10G 1/00 (2006.01) C10G 1/04 (2006.01)

Patent

CA 1154704

"METHOD OF SEPARATING OIL OR BITUMEN FROM SURFACES COVERED WITH SAME" Abstract of the Disclosure The separation of oil or bitumen from a surface of a substrate covered with same is effected by dissolving the oil or bitumen in a solvent to form a solution thereof. A liquid which does not dissolve the oil or bitumen, is non-miscible with the solvent and has substantially higher surface wetting properties than the solvent on substrate is intimately contacted with the surface of the substrate; the solvent and liquid have substantially high interfacial tension relative to one another so as to form in the presence of the oil or bitumen an interfacial membrane-like barrier which is impermeable thereto. The intimate contacting of this liquid with the surface of the substrate causes the liquid to wet the surface and spread thereover to thereby move the interfacial membrane as it is being formed across the surface and displace with this membrane the solution from the surface, and to finally cover the surface with a layer of liquid; the membrane maintains the oil or bitumen in the solvent and prevents passage of same into the layer of liquid. The method of the invention avoids the use of surfactants and the forma- tion of emulsions, and thus the problems associated there- with. The invention finds a particular application in the recovery of oil and bitumen from bitumen covered tar sands and oil sands from oil wells. -1-

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