Process of producing xylose and dissolving pulp

Details Process of producing xylose and dissolving pulp Process of producing xylose and dissolving pulp

C - Chemistry, Metallurgy

13

K

C13K 13/00 (2006.01) D21C 1/04 (2006.01) D21C 3/02 (2006.01)

Patent

CA 2740708

The present invention relates to a process for the production of xylose and dissolving pulp from xylan-containing biomass, such as hardwood. The invention is based on prehydrolysis of the xylan-containing biomass with SO2 in specified conditions, followed by chromatographic fractionation, nanofiltration or precipitation crystallization of the xylose-containing prehydrolyzate to obtain a xylose product having a xylose content of at least 55% on DS. The dissolving pulp obtained from the process can be used for example for the production of viscose.

La présente invention concerne un procédé de production de xylose et de pâte pour transformation chimique à partir de biomasse contenant du xylane comme le bois de feuillus. Linvention est basée sur la préhydrolyse de la biomasse contenant le xylane avec du SO2 dans des conditions spécifiées, suivie dun fractionnement chromatographique, dune nanofiltration ou dune cristallisation par précipitation du préhydrolysat contenant le xylose pour obtenir un produit de xylose ayant une teneur en xylose dau moins 55 % sur matières dissoutes. La pâte pour transformation chimique obtenue à partir de ce procédé peut être utilisée par exemple pour la production de viscose.

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