Improvements in a process for rapid acid hydrolysis of...

C - Chemistry – Metallurgy – 13 – K

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C13K 1/02 (2006.01) D21C 3/20 (2006.01)

Patent

CA 2613745

Improvements in a process for rapid acid hydrolysis of lignocellulosic material and in a hydrolysis reactor, said lignocellulosic material being fed in different levels of a reactor (10) and contacted with flows of lignin organic solvent, water and an extremely dilute solution of a strong inorganic acid, for obtaining a liquid phase of hydrolysis extract and a solid phase of non-reacted and non-dissolved material. A controlled steam flow is injected into the different levels of the reactor (10), so as to provide adequate temperatures of organic solvent and strong inorganic acid and forming the desired products (sugars). A flow of the liquid phase is recirculated in different levels of the reactor (10), the remainder thereof being withdrawn from the reactor (10), abruptly cooled with the solvent submitted to evaporation to obtain a concentrate. The lignin is transferred by decantation and the concentrate is transferred to subsequent process steps.

Améliorations concernant un procédé pour l'hydrolyse acide rapide de matière lignocellulosique et concernant un réacteur d'hydrolyse, ladite matière lignocellulosique étant introduite en différents niveaux d'un réacteur (10) et mise en contact avec des flux de solvant organique de la lignine, d'eau et d'une solution extrêmement diluée d'un acide inorganique fort, pour obtenir une phase liquide d'extrait d'hydrolyse et une phase solide de matière n'ayant pas réagi et non dissoute. On injecte un flux de vapeur contrôlé dans les différents niveaux du réacteur (10), de façon à obtenir les températures adéquates du solvant organique et de l'acide inorganique fort et à former les produits souhaités (sucres). On fait recirculer un flux de la phase liquide en différents niveaux du réacteur (10), le reste de celle-ci étant soutiré du réacteur (10), brusquement refroidi, tout en faisant évaporer le solvant pour obtenir un concentré. La lignine est transférée par décantation et le concentré est transféré vers des étapes de procédé subséquentes.

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