Solvent extraction of organic oils and solvent recovery
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United States of America Patent
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Sep 8, 1987
Grant Date -
N/A
app pub date -
Aug 12, 1986
filing date -
Aug 12, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for recovery of organic oils and residues in association with inorganic solids by solvent extraction and for the recovery of solvent used for the extraction. The organic solvent extracted inorganic solids having remaining associated organic solvent is fluidized in a bed with fluidizing gas comprising superheated vapor of the organic solvent vaporizing and removing a substantial portion of the associated organic solvent. Then the solids are countercurrently contacted with a combustion gas stream at a lower temperature than the solids physically stripping a substantial portion of the residual solvent from the solids, the combustion gas stream being enhanced for combustion by comprising stripped organic solvent and by being heated.
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