Solvent extraction process for tar sands

Details Solvent extraction process for tar sands Solvent extraction process for tar sands

C - Chemistry, Metallurgy

10

G

196/25

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

Patent

CA 1148104

ABSTRACT OF THE DISCLOSURE A solvent extraction process for tar sands is dis- closed wherein a low boiling solvent having a normal boil- ing point of from 20 to 70°C is used to extract tar sands. Raw tar sands are prepared in feed preparation zone 11, and solvent is mixed with tar sands in dissolution zone 14 the solvent:bitumen weight ratio being maintained at from about 0.51:1 to 2:1. This mixture is passed to a separation zone in which bitumen and inorganic fines are separated from ex- tracted sand, the separation zone containing sequentially a classifier 17 and countercurrent extraction column 24. The extracted sand is introduced into a first fluid-bed drying zone 27 fluidized by heated solvent vapors, so as to remove unbound solvent from extracted sand while at the same time lowering the water content of the sand to less than about 2 wt.%. The so-treated sand is then passed into a second fluid-bed drying zone 34 fluidized by a heated inert gas to remove bound solvent. Recovered solvent is recycled to the dissolution zone.

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