Two-stage method for pretreatment of lignocellulosic biomass

A - Human Necessities – 23 – K

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A23K 1/14 (2006.01) A23K 1/22 (2006.01) C12P 19/02 (2006.01)

Patent

CA 2685177

One aspect of the invention relates to a process, comprising treating lignocellulosic biomass according to a first pretreatment protocol, thereby generating a first product mixture; separating the first product mixture into a first plurality of fractions; and treating at least one fraction of said first plurality of fractions according to a second pretreatment protocol, thereby generating a second product mixture. In one embodiment, the lignocellulosic biomass is selected from the group consisting of grass, switch grass, cord grass, rye grass, reed canary grass, miscanthus, sugar-processing residues, sugarcane bagasse, agricultural wastes, rice straw, rice hulls, barley straw, corn cobs, cereal straw, wheat straw, canola straw, oat straw, oat hulls, corn fiber, stover, soybean stover, corn stover, forestry wastes, recycled wood pulp fiber, paper sludge, sawdust, hardwood, softwood, and combinations thereof.

L'invention concerne, sous un aspect, un procédé qui consiste à traiter de la biomasse lignocellulosique selon un premier protocole de prétraitement, générant ainsi un premier mélange de produit; à séparer le premier mélange de produit en une première pluralité de fractions; et à traiter au moins une fraction de la première pluralité de fractions selon un second protocole de prétraitement, générant ainsi un second mélange de produit. Selon un mode de réalisation, la biomasse lignocellulosique est sélectionnée dans le groupe constitué d'herbe, de panic raide, de spartina, de faux seigle, de phalaride, de miscanthus, de résidus de traitement de sucre, de baguasse de canne à sucre, de déchets agricoles, de paille de riz, de balle de riz, de paille d'orge, de rafle de maïs, de paille de céréales, de paille de blé, de paille de colza canola, de paille d'avoine, de balle d'avoine, de fibre de maïs, de fourrage, de canne de soja, de canne de maïs, de déchets forestiers, de fibre de pâte de bois recyclée, de boue de papier, de sciure, de bois de feuillus, de bois de conifères et de combinaisons de ceux-ci.

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