Apparatus and method for reducing residual solvent levels
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United States of America Patent
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Jul 19, 2005
Issued Date -
N/A
app pub date -
Jan 10, 2003
filing date -
Sep 6, 1999
priority date (Note) -
Expired
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Abstract
Apparatus and methods for reducing residual solvent levels in extracted biomass that is contaminated with HFC solvent that includes sparging the biomass extract with a solvent stripping gas such as air or nitrogen are disclosed. Apparatus for carrying out the method include a vessel (12;25) containing extract (26) and a source of the gas. The source may be in the form of a moveable, hollow wand (27) having a sparging gas outlet; or a fixed gas inlet (30) for bubbling the gas through the extract (26).
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