Secondary fiber cellulose product with reduced levels of polychl

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste


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162 63, 162100, D21C 502




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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