Acid post-hydrolysis of xylooligosaccharides from hydrothermal pretreatment for pentose ethanol production

作者：Nakasu P Y S; Ienczak L J; Costa A C; Rabelo S C^*

来源：Fuel, 2016, 185: 73-84.

DOI：10.1016/j.fuel.2016.07.069

• Sugarcane bagasse
• Pentose ethanol
• Hydrothermal pretreatment
• Post-hydrolysis
• Xylooligosaccharides

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).

• 出版日期2016-12-1