PROCESS FOR PRODUCING, IN PARTICULAR ETHANOL, BY SEQUENCED ENZYMATIC HYDROLYSIS OF CELLULOSE AND HEMICELLULOSES OF A LIGNOCELLULOSIC RAW MATERIAL

摘要

A process for producing ethanol includes steps of pre-treatment of the lignocellulosic vegetable raw material, including the steps consisting in destructuring the lignocellulosic vegetable raw material, then in separating, on the one hand, the cellulose (C6) capable of then being hydrolysed (and fermented for the production of ethanol) and, on the other hand, the hemicelluloses capable of then being hydrolysed and the lignins. The hydrolysis of the cellulose and of the hemicelluloses is then carried out in a sequenced manner according to the following steps consisting in:;i) beginning the enzymatic hydrolysis of the cellulose by at least one enzyme for a first period with a view to obtaining an intermediate hydrolysate;;ii) adding hemicelluloses to the intermediate hydrolysate;;iii) continuing the enzymatic hydrolysis of the mixture until a final hydrolysate is obtained at the end of a total period of enzymatic hydrolysis.