catalytic system and process for obtaining 2g bioethanol from xylan / xylose oligomers

摘要

catalytic system and process of obtaining 2g bioethanol from xylan / xylose oligomers is described solid or gelcated bcph-xsgisc (30) catalytic system to obtain 2g bioethanol containing, coimobilized: a) between 0.1% and 2 %, relative to the final suspension mass, of a ph regulating agent (32); b) immobilized enzymes having between 0.3 and 20 mg protein / gram of final suspension: endo / exoxylanases and accessory enzymes (12) to transform xyloligomers to xylose, and glucose isomerase (22) to transform xylose to xylulose and c) between 1% and 20% relative to final yeast suspension mass s. genetically modified or unmodified cerevisiae (31) to transform xylulose into bioethanol (53), components a), b) and c) forming the catalytic system (30) in a gel. the catalytic system (30) may not contain glucose isomerase (22) to convert xylose to xylulose, in which case between 1% and 20% of the final suspension mass will be s. genetically modified cerevisiae (31) to directly transform xylose into bioethanol (53). the process of obtaining 2g bioethanol in the presence of said catalytic system (30) comprises: a) providing the catalytic system (30); b) preparing the xyloligomer substrate (72) to be subjected to alcoholic fermentation; c) preparing in (60) the fermentation medium; d) fermenting in single bioreactor (40), under conditions of alcoholic fermentation, the xylose oligomers obtained in (b) with the aid of catalytic system (30) of a); and e) after the reaction period, separate ethanol (53) and xylitol (51), and optionally remove a fraction of xyloligosaccharides (52).