Method of extraction of wood chemical protection agent by...

B - Operations – Transporting – 27 – K

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B27K 5/00 (2006.01) D21B 1/02 (2006.01) D21B 1/36 (2006.01)

Patent

CA 2069984

Preservatives and oil are extracted from the treated wood. The wood to be culled is chipped, the chips are impregnated with an alkaline solution until they are softened, changing the chemical state of the products to be extracted. Where applicable, the chips can be treated with saturated vapour at superatmospheric pressure between 170°C and 210°C followed by explosive decompression yielding wood fragments. A refining operation is then carried out in a grinder for defibration of the wood. The result is a substantial release of preservatives from the wood particles, which are at least partly defibrated. The chemical preservatives and oil are collected separately from the wood particles in the aqueous phases derived from the impregnation, cooking-decompression and refining phases.

Les préservatifs et l'huile sont extraits du bois traité. Pour ce faire, on déchiquette le bois traité qu'on désire rebuter, on imprègne les copeaux avec une solution alcaline jusqu'à attendrissement des copeaux et modification de l'état chimique des produits à extraire. Le cas échéant, on peut faire subir aux copeaux un traitement avec de la vapeur saturée à pression superatmosphérique entre 170°C et 210°C suivi d'une détente explosive donnant des fragments de bois. On fait suivre d'une opération de raffinage dans un broyeur assurant le défibrage du bois. Il en résulte une libération substantielle des préservatifs des particules de bois au moins en partie défibrées. On recueille les préservatifs chimiques et l'huile séparément des particules de bois dans les phases aqueuses issues des étapes d'imprégnation, cuisson-détente et raffinage.

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