Method for recovering an organic solvent from a waste stream containing supercritical CO2
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United States of America Patent
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Sep 20, 2005
Grant Date -
Mar 6, 2003
app pub date -
Aug 22, 2001
filing date -
Aug 22, 2001
priority date (Note) -
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Abstract
An organic solvent is separated from a waste stream containing supercritical CO2, an organic solvent and etchant contaminants. The process includes separating the supercritical CO2 by subjecting the waste stream to elevated temperature and/or reduced pressure to thereby obtain a first composition containing the supercritical CO2 and a second composition containing the organic solvent and being substantially free of the supercritical CO2; and then removing non-volatile etching contaminants from the second stream search as by at least one of the following: evaporation; distillation; filtration; centrifugation; and settling.
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