A METHOD AND INSTALLATION INTENDED FOR CONTINUOUS EXTRACTION OF A TANIC SUBSTANCE CONTAINED IN A WOODEN MATERIAL AND THE PRODUCTION OF A USED WOOD-CELLULOSE MATERIAL

摘要

A method for the extraction, from a highly tannic woody material, of a tannic substance contained therein, and/or for the production of a usable lignocellulose product in particle form, comprises the following successive steps: a first fragmentation consisting of a reduction of the woody material to chips, a second fragmentation consisting of a reduction of the chips to particles, dispersal of the particles in water thus producing an aqueous solution of the tannic substance as well as lignocellulose particles in suspension in the aqueous solution, and separation of the particles from the solution by filtration. Plant for implementing the method comprises at least, in succession: a shredder (2) of known type for reducing the woody material to chips, means (5, 7) for reducing the chips to particles, a series (6) of containers for dispersing the particles in water to produce an aqueous solution of the tannic substance as well as lignocellulose particles in suspension in the aqueous solution, and filtration means (10) for separating the particles from the solution.