Simplified method for digestion of cellulosic biomass

D - Textiles – Paper – 21 – C

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D21C 3/00 (2006.01) C08B 1/00 (2006.01) C12P 7/10 (2006.01) C12P 19/02 (2006.01) C12P 19/14 (2006.01) C13K 1/02 (2006.01)

Patent

CA 2720393

The inventive process converts cellulosic biomass into a gel-like state that is readily hydrolyzed by appropriate enzymes. First the biomass is mechanically reduced in size. The biomass is then mixed and kneaded with an aqueous solution of a hydrophilic polymer that acts as a conditioning agent or as a co-solvent. During mixing the cellulose (and hemicellulose) in the biomass swells and becomes hydrated forming a viscous gel-like material. The processed material can then be thinned through the addition of water whereupon hydrolytic enzymes are mixed into the material and rapid hydrolysis into free sugars takes place. Dextrins are effective hydrophilic polymers for conditioning biomass. Polyvinyl alcohol is a particularly effective conditioning agent for use with biomass when converted into a viscous gel by adding bo-rate ions.

Linvention concerne un procédé convertissant de la biomasse cellulosique en un état de type gel qui est aisément hydrolysé par des enzymes appropriées. Dabord la biomasse est mécaniquement réduite en taille. La biomasse est ensuite mélangée et malaxée avec une solution aqueuse dun polymère hydrophile qui sert dagent de conditionnement ou de co-solvant. Pendant le mélange la cellulose (et lhémicellulose) présente dans la biomasse gonfle et shydrate, formant ainsi une matière de type gel visqueux. La matière traitée peut ensuite être diluée par l'ajout deau, après quoi des enzymes hydrolytiques sont mélangées dans la matière et une hydrolyse rapide conduisant à des sucres libres a lieu. Les dextrines sont des polymères hydrophiles efficaces pour le conditionnement de la biomasse. Le poly(alcool vinylique) est un agent de conditionnement particulièrement efficace pour être utilisé avec de la biomasse lorsquelle est convertie en un gel visqueux par ajout dions borates.

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