Method of extracting chemical preservatives from treated wood

Details Method of extracting chemical preservatives from treated wood Method of extracting chemical preservatives from treated wood

1992-07-16

1993-11-16

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Defibration by projection or explosion

162 12, 162 90, 162189, D21B 112

Patent

active

052620042

ABSTRACT:
Preservatives and oil are extracted from treated wood. For this purpose, treated wood that is intended to be discarded is comminuted, the chips are impregnated with an alkaline solution until softening of the chips and modification of the chemical state of the products to be extracted. Possibly, the chips may be treated with saturated steam at a temperature between 170.degree. C. and 210.degree. C. followed by an explosive decompression giving wood fragments. This is followed by a refining operation in a crusher permitting the grinding of the wood. The result is a substantial release of the preservatives and oil from the wood chips which are at least partly disintegrated. The chemical preservatives and the oil are collected separately from the wood chips in the aqueous phases which are produced in the impregnation, steam cooking-explosive decompression and refining steps.

REFERENCES:
patent: 3878994 (1975-04-01), Tee
patent: 4666612 (1987-05-01), Hoffman et al.
patent: 4797135 (1989-01-01), Kubat et al.
patent: 4798651 (1989-01-01), Kokta
patent: 5028229 (1991-07-01), Guidat et al.
patent: 5029299 (1991-07-01), Rodgers

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