Methods and apparatus for hydrolyzing cellulosic material

C - Chemistry – Metallurgy – 13 – K

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C13K 1/02 (2006.01) C08H 8/00 (2010.01) C08B 1/08 (2006.01)

Patent

CA 2703900

A method of hydrolyzing woody cellulosic material containing lignin and air pockets involves impregnating the woody cellulosic material a first alkali having a pH of from 10 to 14 such that the first alkali is in contact with the lignin within the woody cellulosic material. Thereafter, the woody cellulosic material is advanced through a gravity pressure vessel for the acid hydrolysis conversion of cellulosic material to sugars. In accordance with other methods, ultrasound may be introduced during impregnation or at the gravity pressure vessel or both.

L'invention porte sur un procédé d'hydrolysation de matériau cellulosique ligneux contenant de la lignine et des poches d'air, qui comprend l'imprégnation du matériau cellulosique ligneux par un premier alcali ayant un pH de 10 à 14, de telle sorte que le premier alcali est en contact avec la lignine à l'intérieur du matériau cellulosique ligneux. Ensuite, on fait avancer le matériau cellulosique ligneux à travers une cuve sous pression gravitationnelle pour la conversion par hydrolyse acide du matériau cellulosique en sucres. Selon d'autres procédés, des ultrasons peuvent être introduits durant l'imprégnation ou au niveau de la cuve sous pression gravitationnelle, ou dans les deux.

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