C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/16
C10G 1/04 (2006.01) C10C 3/00 (2006.01) E21B 43/22 (2006.01) E21B 43/40 (2006.01)
Patent
CA 1181706
EX SITU AND IN SITU SEPARATION OF BITUMEN FROM BITUMEN-BEARING SUBSTRATE Abstract Bitumen is separated from water-bearing tar sands by solvent extraction techniques employing solvents having an inverse critical solution point. Preferred solvents include the secondary and tertiary amines such as diisopropylamine and triethylamine. The amine is admixed with the tar sands to dissolve the bitumen. The resulting mixture of solvent and bitumen is then separated from the tar sand solids. The bitumen is separated from the solvent and water by thermal distillation techniques. The solvent and water are condensed, placed in a decanter, and raised to a temperature above the critical solution temperature of the solvent, at which temperature the two liquid phases, a solvent phase and a water phase, are formed. The solvent is decanted and recycled to the head of the process to be remixed with fresh tar sands. The water fraction is further treated to assure that all residual solvent has been removed and is then returned to the environment.
394431
Reflux Limited (a Partnership)
Smart & Biggar
LandOfFree
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