Process for the production of anhydrosugars and fermentable...

Details Process for the production of anhydrosugars and fermentable... Process for the production of anhydrosugars and fermentable...

C - Chemistry, Metallurgy

13

K

C13K 13/00 (2006.01) C07H 3/10 (2006.01) C13K 1/02 (2006.01)

Patent

CA 2091373

A process is described for the production of anhydrosugars, such as levoglucosan (1,6-anhydro-.beta.-D- glucopyranose), from liquids obtained by the fast thermal pyrolysis of pretreated lignocellulosics or celluloses. In this process, the pyrolytic liquids containing the anhydrosugars are produced with a substantially reduced amount of lignin-derived components by using as feedstock materials which have been previously delignified and then pretreated, or by preferential oxidation of the lignin fraction of a pretreated biomass during pyrolysis. The preparation from pretreated biomass of pyrolytic liquors from which the lignin derived chemical products of fast pyrolysis are absent or in low concentrations permits simpler and more economical recovery of crystalline levoglucosan and other anhydrosugars, or a more economical preparation of readily fermentable aqueous sugar solutions therefrom. A new procedure for the recovery of crystalline levoglucosan from such solutions is also described.

On décrit un procédé permettant de produire des anhydrosucres, tels que le lévoglucosane (1,6-anhydro-bêta-D-glucopyranose), à partir de liquides obtenus par pyrolyse thermique rapide de matières lignocellulosiques ou de celluloses prétraitées. Ce procédé permet d'obtenir des liquides pyrolytiques contenant des anhydrosucres qui renferment une quantité considérablement moindre de constituants dérivés de la lignine, car il utilise des matières de charge préalablement délignifiées puis prétraitées ou comporte l'oxydation préférentielle de la fraction lignine d'une biomasse prétraitée durant la pyrolyse. La préparation, à partir de biomasse prétraitée, de liqueurs pyrolytiques qui contiennent peu sinon aucun produit chimique dérivé de la lignine par pyrolyse rapide, permet de récupérer par une méthode plus simple et plus économique le lévoglucosane cristallin et les autres anhydrosucres ou de produire de façon plus économique, à partir de celle-ci, des solutions aqueuses de sucre facilement fermentescible. On décrit aussi dans l'invention un nouveau procédé permettant de récupérer le lévoglucosane cristallin à partir de telles solutions.

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