D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 3/20 (2006.01) C12P 7/12 (2006.01) C13K 1/02 (2006.01)
Patent
CA 2677862
A method for fractionating a lignocellulosic material, the method comprising; contacting (2) the lignocellulosic material with an ionic liquid (3) and dissolving the lignocellulosic material therein, providing a second liquid (7) which is immiscible with the ionic liquid and is also a non-solvent for cellulose, adding the second liquid to the ionic liquid so as to form a biphasic system (6) which comprises an ionic liquid phase essentially free of lignocellulose and a second liquid phase comprising lignin in solution and cellulose as a precipitate, separating the two phases and recovering (8) the precipitated cellulose from the separated second liquid phase.
L'invention concerne un procédé de fractionnement d'une matière lignocellulosique. Le procédé comporte les opérations consistant à : mettre en contact de la matière lignocellulosique avec un liquide ionique (3) et dissoudre la matière lignocellulosique dans celui-ci ; prendre un second liquide (7) non miscible avec le liquide ionique et non solvant pour la cellulose ; ajouter le second liquide au liquide ionique de façon à former un système biphasique (6) qui comporte une phase liquide ionique sensiblement exempte de lignocellulose et une seconde phase liquide incluant de la lignine en solution et une cellulose comme précipité, séparer les deux phases et récupérer (8) la cellulose ayant précipité à partir de la seconde phase liquide séparée.
Doherty William Orlando Sinclair
Edye Leslie Alan
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Queensland University Of Technology
LandOfFree
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