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Process for selective recovery of relatively metals-free bitumen from tar sand using a halogenated aliphatic solvent in combination with a second solvent | 1980-08-12 | selective recovery of tar sand bitumen; tar sand bitumen; two-solvent system; patent; metal-free bitumen | A process for the selective recovery of tar sand bitumen from tar sands using a two-solvent system comprising a halogenated aliphatic solvent in combination with a second solvent selected from an oxygenated compound. The process provides for an inexpensive method for selectively removing substantial... |
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