Process for the fermentative production of ethanol from...

C - Chemistry – Metallurgy – 12 – P

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C12P 7/10 (2006.01)

Patent

CA 2660673

The present invention relates to a process for obtaining fuel ethanol by using agricultural and agroindustrial waste materials composed of lignocellulose, and especially sugar cane bagasse. These residues have significant contents of carbohydrates in the form of polysaccharides (cellulose and hemicellulose), which can be hydrolysed by chemical and enzymic processes. The hemicellulose fraction is submitted to mild hydrolysis with sulphuric acid, and the solid material from this hydrolysis is submitted to a process of saccharif ication (enzymic hydrolysis) with simultaneous rapid alcoholic fermentation under conditions which allow a significant increase in conversion to alcohol in a greatly shortened time.

La présente invention porte sur un procédé d'obtention d'éthanol combustible à l'aide de matières de déchets agricoles et agro-industriels composées de lignocelluloses et notamment de bagasse de canne à sucre. Ces résidus ont des teneurs significatives en glucides sous la forme de polysaccharides (cellulose et hémicellulose) qui peuvent être hydrolysés par des procédés chimiques et enzymatiques. La fraction hémicellulose est soumise à une hydrolyse modérée par de l'acide sulfurique, et la matière solide provenant de cette hydrolyse est soumise à un procédé de saccharification (hydrolyse enzymatique) avec une fermentation alcoolique rapide simultanée dans des conditions qui permettent une augmentation significative de la conversion en alcool en un temps fortement diminué.

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