Acid Post-hydrolysis Of Xylooligosaccharides From Hydrothermal Pretreatment For Pentose Ethanol Production

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Hydrothermal pretreatment solubilizes about 65% of the hemicelluloses in sugarcane bagasse. However, nearly 80% of the xylose recovered from the hemicellulosic hydrolysate is present as xylooligosaccharides (XO's), which cannot be directly fermented into pentose (C5) ethanol. In this work a kinetic study of the post hydrolysis process considering the use of three acids - sulfuric, oxalic and maleic - was performed. Xylose and furfural post-hydrolysis profiles showed the reaction time in which xylose peaked with minimum furfural production. Among the three studied acids, sulfuric acid showed the fastest kinetics of post-hydrolysis with XO's being fully hydrolyzed in less than 1 h reaction time. C5 fermentation experiments showed that the detoxified post-hydrolysates fermented with ethanol yields ranging from 0.10 to 0.31 g ethanol g(-1) reducing sugars. Most samples were fermented from 48 to 72 h of experiment with productivities ranging from 0.02 to 0.43 g.L-1.h(-1). (C) 2016 Elsevier Ltd. All rights reserved.1857384FAPESP - Sao Paulo Research Foundation [2013/05369-2]Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP