DUAL-SOLVENT EXTRACTION OF OIL SAND BITUMEN
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United States of America Patent
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Dec 15, 2016
app pub date -
Jun 15, 2015
filing date -
Jun 15, 2015
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Abstract
A process for extracting bitumen from oil sand is provided, comprising: contacting mined oil sand with a high-flash point heavy solvent (HS) to produce a dense oil sand slurry; mixing the dense slurry with a first light solvent (LS) stream and a second LS stream to give a heavy solvent to light solvent (HS/LS) mass ratio of about 75/25 to about 40/60; subjecting the HS/LS-diluted oil sand slurry to a first stage solid-liquid separation to produce a first liquids stream containing bitumen and a first solids stream; and washing the first solids stream with a mixed solvent having a HS/LS mass ratio of about 50/50 to about 20/80 and subjecting the solids and the mixed solvent to a second stage solid-liquid separation to produce a second liquids stream and a second solids stream.
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