PROCESS FOR SUPERCRITICAL OR SUBCRITICAL PARTIAL DELIGNIFICATION AND FILLING OF A LIGNOCELLULOSIC MATERIAL

The invention relates to a process for treating lignocellulosic material， preferably wood， comprising the following successive steps: (1) extraction of lignin by a fluid in supercritical or subcritical phase in order to extract from 40 to 85%， in % by weight， of the lignin from 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 of a three-dimensional network of filling compound converted and incorporated in a network of cellulose and of lignin. The invention relates to a process for treating lignocellulosic material， preferably wood， comprising the following successive steps: (1) extraction of lignin by a fluid in supercritical or subcritical phase in order to extract from 40 to 85%， in % by weight， of the lignin from 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 of a three-dimensional network of filling compound converted and incorporated in a network of cellulose and of lignin.