Solvent extraction process

Details Solvent extraction process Solvent extraction process

C - Chemistry, Metallurgy

10

G

196/28

C10G 1/04 (2006.01)

Patent

CA 1085763

ABSTRACT A continuous solvent extraction process for tar-sand uses a closed rotary contactor. A tar-sand/water slurry stream and a solvent stream are passed countercurrent through the contactor and three phases are formed: tar- sand solids at the bottom of the contactor, a barrier layer of water in which the solids are contained and an uppermost solvent phase. The solids during their travel through the contactor are repeatedly lifted off the bottom of the contactor and tumbled through the solvent phase so that the bitumen oils content of the tar-sand is progressively dissolved in the solvent. A solvent stream containing the dissolved bitumen oils is removed from one end of the contactor and discard stream con- sisting essentially of sand and water is removed from the other end.

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