Separation of reactive cellulose from lignocellulosic...

C - Chemistry – Metallurgy – 08 – H

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C08H 8/00 (2010.01)

Patent

CA 2715458

A process for separating the components of lignocellulosic biomass for the purpose of producing a pure reactive cellulose is disclosed. The process has two stages. In the first stage, the lignocellulosic biomass is pretreated with steam, with or without an acid catalyst, and then pressed, with or without the presence of an eluent, to remove hemicellulose and other impurities. In the second stage, the pretreated biomass is extracted with a solvent such as ethanol with or without acid catalysts in order to remove lignin and release a purified cellulose stream. The extracted cellulose is then rapidly decompressed to rupture the fibrous structure. The process provides a purified cellulose stream that is relatively easy to hydrolyze with enzymes and ferment to biofuels and other chemicals such as ethanol.

Le procédé ci-décrit permet de séparer les composants d'une biomasse lignocellulosique dans le but d'obtenir une cellulose réactive pure. Le procédé comporte deux étapes. Dans la première étape, la biomasse lignocellulosique est prétraitée à la vapeur, avec ou sans catalyseur acide, puis pressée, en présence ou non d'un éluant, pour éliminer l'hémicellulose et autres impuretés. Dans la seconde étape, la biomasse prétraitée est extraite avec un solvant tel que l'éthanol avec ou sans catalyseurs acides afin de séparer la lignine et de libérer un flux de cellulose purifiée. La cellulose extraite est ensuite rapidement décompressée pour rompre la structure fibreuse. Le procédé génère un flux de cellulose purifiée qui est relativement facile à hydrolyser avec des enzymes, et soumis à fermentation jusqu'à obtention de biocarburants ou autres produits chimiques tels que l'éthanol.

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