Method for extracting bitumen from an oil sand feed stream
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United States of America Patent
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Dec 29, 2015
Grant Date -
Mar 21, 2013
app pub date -
Mar 20, 2012
filing date -
Mar 21, 2011
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Abstract
The present invention is a method for extracting bitumen from an oil sand feed stream including at least the steps of: (a) providing an oil sand feed stream; (b) contacting the oil sand feed stream with a liquid comprising an aliphatic hydrocarbon solvent thereby obtaining a solvent-diluted oil sand slurry; (c) depositing the solvent-diluted oil sand slurry as a filter cake on a filter medium and filtering the solvent-diluted oil sand slurry, thereby obtaining a solids-enriched stream and a filtrate, wherein during the filtering the pressure above the filter cake is at least 1.7 bara; and (d) lowering the pressure of the solids-enriched stream to below 1.2 bara.
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