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US 4,057,485 AGranted
Solvent extraction of oil from tar sands utilizing a chlorinated ethane solvent
OwnerNeil Franklin Blaine, deceased, by Geneva Blaine, executrixinventors
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Abstract
Oil is efficiently solvent extracted from tar sands utilizing a trichloroethane solvent at mild conditions. The process preferably utilizes minor amounts of surfactant and polyelectrolytes. The process has resulted in unexpectedly high yields of oil with unexpectedly low solvent loss.
Claims3
In an oil solvent extraction process wherein a tar sand is contacted with a solvent at mild conditions of temperatures from 70.degree. F. to about 800.degree. F. and pressures of 0 to about 200 psig, the improvement wherein said solvent is monochloroethane, dichloroethane, trichloroethane or tetrachloroethane.
Dependencies are inferred from the claim text.