Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Patent
1991-04-15
1991-12-24
Hastings, Karen M.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Waste paper or textile waste
162 63, 162199, 162DIG4, 423DIG20, D21C 502, D21C 908
Patent
active
050749587
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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Blaney Carol A.
Hossain Shafi U.
Hastings Karen M.
Herrick William D.
Kimberly-Clark Corporation
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