Method for removing polychlorinated dibenzodioxins and polychlorinated dibenzofurans and stickies from secondary fibers using supercritical propane solvent extraction
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United States of America Patent
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Dec 24, 1991
Issued Date -
N/A
app pub date -
Apr 15, 1991
filing date -
Oct 12, 1990
priority date (Note) -
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Abstract
A process for removing stickies and/or 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 propane for a period of time sufficient to extract a substantial portion of the stickies and/or PCDD's and PCDF's without substantially damaging the fibers. Extraction efficiencies of up to 95% for PCDD's or PCDF's and of about 70% to 95% for stickies have been achieved with the technique.
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