Process for pretreating a lignocellulosic material with a...

D - Textiles – Paper – 21 – C

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D21C 3/04 (2006.01) C08B 37/14 (2006.01) C12P 7/08 (2006.01)

Patent

CA 2712315

The invention provides a process for pretreating a lignocellulosic plant raw material in order to obtain a pretreated material that is capable of being hydrolyzed and fermented for the production of bioethanol, characterized in that it comprises the following successive steps that consist in :.cndot.(i) destructuring the lignocellulosic plant raw material by placing it in the presence of a mixture containing formic acid and water, at a reaction temperature between 95°C and 110°C; .cndot.(ii) then, at atmospheric pressure and prior to any hydrolysis then fermentation action, in separating : * on the one hand, the solid phase, mainly composed of said cellulose, constituting a first co-substrate, capable of then being hydrolyzed and fermented for the production of bioethanol; and * on the other hand, the liquid phase, containing, in particular in aqueous solution, the formic acid, the lignins, and the hemicelluloses, constituting a second co-substrate, capable of then being hydrolyzed and fermented for the production of bioethanol.

L'invention porte sur un procédé pour prétraiter une matière première végétale lignocellulosique afin d'obtenir un matériau prétraité qui est apte à être hydrolysé et fermenté pour la production de bioéthanol. Le procédé est caractérisé par le fait qu'il comprend les étapes successives suivantes, qui consistent à : (i) déstructurer la matière première végétale lignocellulosique par disposition de celle-ci en présence d'un mélange contenant de l'acide formique et de l'eau, à une température de réaction entre 95°C et 110°C. (ii) ensuite, à la pression atmosphérique et avant toute action d'hydrolyse puis de fermentation, séparer : * d'une part, la phase solide, principalement composée de ladite cellulose, constituant un premier co-substrat, apte à être ensuite hydrolysée et fermentée pour la production de bioéthanol ; et * d'autre part, la phase liquide, contenant, en particulier en solution aqueuse, l'acide formique, les lignines et les hémicelluloses, constituant un deuxième co-substrat, apte à être ensuite hydrolysée et fermentée pour la production de bioéthanol.

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