Tar sands extraction process
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United States of America Patent
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May 6, 1997
Issued Date -
N/A
app pub date -
Jun 6, 1995
filing date -
Oct 4, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hot water extraction process for extracting bitumen from tar sands is taught using a conditioning agent containing sodium and/or potassium bicarbonate or, alternatively, sodium bicarbonate and/or potassium bicarbonate and sources of calcium ions and/or magnesium ions. The conditioning agent replaces the caustic soda agent previously used in tar sand extraction. The use of the alkali metal bicarbonate solvent substantially eliminates the production of sludge in tar sand extraction and maintains or improves bitumen recovery. The process allows for hot conditioning agent solution to be recycled to the process by use of a recycle storage tank.
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