Improved method for the production of glucose from...

C - Chemistry – Metallurgy – 12 – P

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C12P 19/14 (2006.01) C08H 8/00 (2010.01) C12P 7/10 (2006.01) C12P 19/02 (2006.01)

Patent

CA 2747823

A method for producing glucose from a lignocellulosic feedstock is provided. The method comprises pretreating the lignocellulosic feedstock with acid to produce a pretreated feedstock composition. A calcium-containing stream is provided that comprises calcium that is obtained from the lignocellulosic feedstock and a calcium carbonate-containing stream is obtained by precipitation of the calcium from the calcium-containing stream. The pH of the pretreated feedstock is adjusted with (a) the calcium carbonate-containing stream; (b) a calcium hydroxide-containing stream that is derived from said calcium carbonate-containing stream by subjecting said calcium carbonate-containing stream to calcination; or (c) a combination of the calcium carbonate-containing stream and the calcium hydroxide-containing stream. The pH adjustment results in a neutralized pretreated lignocellulosic feedstock having a pH between about 3 and about 9 and enzymatic hydrolysis of the neutralized, pretreated lignocellulosic feedstock is then conducted with cellulase enzymes to produce the glucose.

L'invention concerne un procédé pour la production de glucose à partir d'une matière première lignocellulosique. Le procédé consiste à prétraiter la matière première lignocellulosique avec un acide pour obtenir une composition de matière première prétraitée, générer un courant contenant du calcium provenant de la matière première lignocellulosique et un courant contenant du carbonate de calcium obtenu par précipitation du calcium du courant contenant du calcium, ajuster le pH de la matière première prétraitée avec (a) le courant contenant du carbonate de calcium, (b) un courant contenant de l'hydroxyde de calcium obtenu à partir dudit courant contenant du carbonate de calcium en soumettant ce dernier à une calcination, ou (c) une combinaison de ces deux courants, l'ajustement du pH permettant d'obtenir une matière première lignocellulosique prétraitée neutralisée dont le pH se situe entre environ 3 et environ 9, puis soumettre cette matière première à une hydrolyse enzymatique avec des cellulases pour obtenir du glucose.

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