Extraction of toxic organic contaminants from wood

Details Extraction of toxic organic contaminants from wood Extraction of toxic organic contaminants from wood

C - Chemistry, Metallurgy

07

C

C07C 39/36 (2006.01) B01J 19/08 (2006.01) C07C 37/70 (2006.01) C07D 307/91 (2006.01) C07D 319/24 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2127242

A process is provided herein for extracting organic toxic contaminants including pentachlorophenol, polychlorinated dibenzo-p-dioxins, and polychlorinated dibenzofurans, from wood, e.g. , utility poles, fence posts,~ or railway ties. The process comprises extracting the wood with a supercritical fluid in conjunction with an entrainer having wood swelling properties and a hydrogen-bond-breaking agent for breaking the hydrogen bond between the organic toxic contaminants and the wood, at conventional supercritical fluid extraction temperatures and pressures. The process is further improved by exposing, either in a slurry of the wood phase, or in a liquid phase resulting from such extraction, the contaminants to UV, e.g., sunlight, in the presence of a photosensitizer.

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