Method for removing polychlorinated dibenzodioxins and polychlorinated dibenzofurans from secondary fibers using supercritical CO.sub.2 extraction
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United States of America Patent
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Apr 23, 1991
Grant Date -
N/A
app pub date -
Oct 12, 1990
filing date -
Oct 12, 1990
priority date (Note) -
Expired
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Abstract
A process for removing PCDD's and PCDF's from cellulose-containing fibers such as waste paper is provided. The process comprises contacting the fibers with supercritical or near supercritical carbon dioxide for a period of time sufficient to extract a substantial portion of the PCDD's and PCDF's without substantially damaging the fibers. Extraction efficiencies of greater than 95% have been achieved with the technique.
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