Method for low water hydrolysis or pretreatment of...

C - Chemistry – Metallurgy – 13 – K

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C13K 1/02 (2006.01) C08H 8/00 (2010.01)

Patent

CA 2732084

A method is provided for hydrolyzing polysaccharides in a lignocellulosic feedstock to produce monosaccharides or pretreating a lignocellulosic feedstock, in which an aqueous slurry of the lignocellulosic feedstock is fed into a pressurized dewatering zone wherein the feedstock is partially dewatered and then is compressed into a plug. The plug is introduced into a reaction zone that operates at a pressure (P) equal to greater than about 90 psia and under suitable temperature and pH conditions to hydrolyze the polysaccharides or pretreat the feedstock. The plug provides a pressure seal between the outlet of the dewatering zone and the reaction zone. The pressure (P dwi) of the aqueous slurry of the lignocellulosic feedstock at the inlet of the dewatering device is related to P r as follows: 0<=.DELTA.P < the lesser of [(P r - 20 psia) and 220 psia], and where .DELTA.P is the absolute difference in pressure between Pr and P dwi in psia.

Cette invention concerne un procédé dhydrolyse des polysaccharides dans une charge lignocellulosique pour produire des monosaccharides, ou un procédé de prétraitement dune charge lignocellulosique, une solution épaisse aqueuse de la charge lignocellulosique étant introduite dans une zone de déshydratation sous pression où la charge est partiellement déshydratée puis est comprimée en un bouchon. Le bouchon est introduit dans une zone réactionnelle fonctionnant à une pression (Pr) égale ou supérieure à environ 90 psia et dans des conditions de température et de pH appropriées pour hydrolyser les polysaccharides ou prétraiter la charge. Le bouchon assure un joint de pression entre le port de sortie de la zone de déshydratation et la zone réactionnelle. La pression (Pdwi) de la solution épaisse aqueuse de la charge lignocellulosique au port dentrée du dispositif de déshydratation est associée à Pr comme suit : 0 = ?P < valeur la plus faible de [(Pr - 20 psia) et 220 psia], et ?P étant la différence absolue de pression entre Pr et Pdwi en psia.

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