Photodegradation of toxic contaminants

Details Photodegradation of toxic contaminants Photodegradation of toxic contaminants

1995-09-21

1997-12-16

Gorgos, Kathryn L.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

2041574, 20415748, 2041576, 20415794, 588210, 588212, C07C 100

Patent

active

056988290

ABSTRACT:
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 an agent to break 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. The present invention also provides for the photodegradation of a solution of organic toxic chemicals including pentachlorophenol, polychlorinated dibenzo-p-dioxins, and polychlorinated dibenzofurans, by exposing such solution to UV, e.g., sunlight, in the presence of a photosensitizer.

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