Process for supercritical or subcritical partial delignification and filling of a lignocellulosic material
AssigneeSAS Woodoo
InventorTimothée Boitouzet
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Abstract
The invention concerns a process for treating lignocellulosic material, preferably wood, comprising the following successive steps: (1) extracting lignin by a fluid in supercritical or subcritical phase to extract 40 to 85% by weight % of the lignin of the initial material; (2) filling by a filling compound, preferably in the presence of a fluid in supercritical or subcritical phase; and (3) finishing, so as to obtain a composite material formed by a three-dimensional network of filling compound that is transformed and incorporated in a network of cellulose and lignin.
Claims20
A method for processing an architecture of lignocellulosic material, comprising:
- (a) using at least one fluid in a supercritical or subcritical phase to extract at least a portion of lignin from said architecture of lignocellulosic material to produce a delignified structure;
- (b) subjecting said delignified structure to conditions sufficient to functionalize said delignified structure, thereby providing a functionalized delignified structure;
- and
- (c) bringing said functionalized delignified structure in contact with a filling compound to fill at least a portion of said functionalized delignified structure, thereby providing said functionalized delignified structure or derivative thereof comprising said filling compound or derivative thereof,
- wherein (a) is performed before (b), and
- wherein said lignocellulosic material is at least partially transparent after performance of (a), (b), and (c).
Dependencies are inferred from the claim text.