Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1994-07-08
1995-12-19
Lone, Werren B.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568761, 588204, C07C 3768
Patent
active
054769752
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.
REFERENCES:
patent: 4308200 (1981-12-01), Fremont
patent: 4338199 (1982-07-01), Modell
patent: 4543190 (1985-09-01), Modell
patent: 4567115 (1986-01-01), Trumble
patent: 4847002 (1989-07-01), Trumble et al.
patent: 5009745 (1991-04-01), Hossain et al.
patent: 5009746 (1991-04-01), Hossain et al.
patent: 5074958 (1991-12-01), Blaney et al.
patent: 5213660 (1993-05-01), Hossain et al.
patent: 5252729 (1993-10-01), De Crosta et al.
Supercritical Carbon Dioxide Extraction of Southern Pine and Ponderosa Pine, David C. Ritter et al, Wood and Fiber Science, Jan. 1991 V. 230 pp. 98-115.
Effect of Fatty Acid Removal on Treatability of Douglas-Fir, S. Kumar and J. J. Morrell, The International Research Group on Wood Preservation Process Section 4, IRG/WP 93-40008.
Cui Futong
Ruddick John N. R.
LandOfFree
Extraction of toxic organic contaminants from wood and photodegr does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Extraction of toxic organic contaminants from wood and photodegr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extraction of toxic organic contaminants from wood and photodegr will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-992959