Process for upgrading wood parts

B - Operations – Transporting – 27 – N

Patent

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B27N 1/00 (2006.01) B27N 3/00 (2006.01)

Patent

CA 2514602

Process for upgrading wood parts, wherein the wood parts in a hydrothermolysis step are brought under the influence of saturated steam at a temperature in the range of 130-220~C, such that a conversion of hemicellulose and lignin present in the wood parts takes place, wherein the wood parts are subsequently dried in a curing step to a moisture content which is lower than about 3 wt.% at a temperature in the range of 100-220~C, wherein the wood parts at the start of the hydrothermolysis step have an initial moisture content which is in the range of 10-25 wt.%.

L'invention concerne un procédé de traitement de pièces en bois, ces pièces en bois étant amenées sous l'influence de vapeur saturée lors d'une étape d'hydrothermolyse à une température comprise entre 130 et 220 ·C, de sorte qu'une conversion d'hémicellulose et de lignine présente dans les pièces en bois aient lieu. Dans ce procédé, les pièces en bois sont ensuite séchées au cours d'une étape de séchage pour atteindre une teneur en eau inférieure à environ 3 % en poids à une température comprise entre 100 et 220 ·C. Les pièces en bois possèdent une teneur en eau initiale au début de l'étape d'hydrothermolyse comprise entre 10 et 25 % en poids.

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