Tower reactors for bioconversion of lignocellulosic material

C - Chemistry – Metallurgy – 12 – P

Patent

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C12P 7/10 (2006.01) C12M 1/40 (2006.01)

Patent

CA 2207368

An apparatus for enzymatic hydrolysis and fermentation of pretreated lignocellulosic material, in the form of a tower bioreactor, having mixers to achieve intermittent mixing of the material. Precise mixing of the material is important for effective heat and mass transfer requirements without damaging or denaturing the enzymes or fermenting microorganisms. The pretreated material, generally in the form of a slurry, is pumped through the bioreactor, either upwards or downwards, and is mixed periodically as it passes through the mixing zones where the mixers are located. For a thin slurry, alternate mixing can be achieved by a pumping loop which also serves as a heat transfer device. Additional heat transfer takes place through the reactor heat transfer jackets.

La présente invention vise un appareil servant à l'hydrolyse et à la fermentation enzymatiques d'une matière lignocellulosique prétraitée. Il s'agit d'une forme de bioréacteur muni d'agitateurs permettant un mélangeage intermittent et approprié de la matière, ce qui assure un transfert efficace de chaleur et de masse sans dommage ou dénaturation des enzymes ou des micro-organismes de fermentation. La matière prétraitée, généralement sous forme de bouillie, est pompée vers le haut ou vers le bas du bioréacteur et elle est mélangée périodiquement lorsqu'elle passe dans la zone de mélange où sont situés les agitateurs. Dans le cas d'une bouillie légère, un mélangeage alternatif peut être réalisé au moyen d'une boucle de pompage, qui sert également de dispositif de transfert de chaleur tout comme le chemisage du bioréacteur.

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