C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 29/82 (2006.01) C07C 31/08 (2006.01) C10G 3/00 (2006.01) C10L 1/182 (2006.01) C12P 7/02 (2006.01) C12P 7/10 (2006.01) C12P 19/14 (2006.01)
Patent
CA 2733954
A method for obtaining a concentrated alcohol solution from a lignocellulosic feedstock. The lignocellulosic feed-stock is hydrolyzed to prepare a sugar solution. The sugar solution is fermented to produce a fermentation broth comprising alcohol and at least about 1 g ammonium ions/kg fermentation broth. The alcohol in the fermentation broth is then concentrated by distillation to produce an alcohol-enriched vapour. Either before distillation, during distillation or during the azeotrope breaking process, the concentration of ammonia in the alcohol-enriched vapour can be reduced by acid addition to at most about 300 ppm. The alcohol in the alcohol-rich vapour is then further concentrated by an azeotrope breaking process to provide the concentrated alcohol solution.
Linvention concerne un procédé pour lobtention dune solution concentrée dalcool à partir dune charge d'alimentation lignocellulosique. La charge d'alimentation lignocellulosique est hydrolysée pour préparer une solution de sucres. La solution de sucres est amenée à fermenter pour produire un bouillon de fermentation comprenant de lalcool et au moins environ 1 g dions ammonium/kg de bouillon de fermentation. Lalcool dans le bouillon de fermentation est ensuite concentré par distillation pour produire une vapeur enrichie en alcool. Soit avant la distillation, soit pendant la distillation, soit pendant le procédé de cassage de lazéotrope, la concentration de lammoniac dans la vapeur enrichie en alcool peut être réduite par ajout dacide à hauteur dau maximum environ 300 ppm. Lalcool dans la vapeur riche en alcool est encore concentré par un procédé de cassage dazéotrope pour fournir la solution concentrée dalcool.
Gowling Lafleur Henderson Llp
Iogen Energy Corporation
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