PubAg

Main content area

Acetone/water oxidation of corn stover for the production of bioethanol and prebiotic oligosaccharides

Author:
Katsimpouras, Constantinos, Dedes, Grigorios, Bistis, Perrakis, Kekos, Dimitrios, Kalogiannis, Konstantinos G., Topakas, Evangelos
Source:
Bioresource technology 2018 v.270 pp. 208-215
ISSN:
0960-8524
Subject:
acetone, bioethanol, biomass, corn stover, distillation, enzymatic treatment, ethanol, ethanol production, fermentation, glucose, hemicellulose, liquefaction, mass transfer, mixing, oxidation, prebiotics, saccharification, slurries, viscosity, xylanases, xylooligosaccharides
Abstract:
Ethanol production at high-gravity promise to achieve concentrations over the threshold for an economical distillation process and concurrently reduce water consumption. However, a persisting limitation is the poor mass transfer conditions resulting in low ethanol yields and concentrations. Hereby, the combination of an acetone/water oxidation pretreatment process (AWO) with a liquefaction/saccharification step, using a free-fall mixer, before simultaneous saccharification and fermentation (SSF) can realize ethanol concentrations of up to ca. 74 g/L at a solids content of 20 wt%. The free-fall mixer achieved a biomass slurry viscosity reduction by 87% after only 2 h of enzymatic saccharification, indicating the efficiency of the mixing system. Furthermore, the direct enzymatic treatment of AWO pretreated corn stover (CS) by a GH11 recombinant xylanase, led to the production of xylooligosaccharides (XOS) with prebiotic potential and the removal of insoluble fibers of hemicellulose improved the glucose release of AWOCS by 22%.
Agid:
6135831