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

Author(s)

Nakasu, P. Y. S. ; Ienczak, L. J. ; Costa, A. C. ; Rabelo, S. C.

• Document type: Journal article
• Source: FUEL; v. 185, p. 73-84, DEC 1 2016.
• Web of Science Citations: 13

Abstract

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. (AU)

• FAPESP's process: 13/05369-2 - Kinetics of acid hydrolysis of the liquid stream of hydrothermal Pretreament
• Grantee: Pedro Yoritomo Souza Nakasu
• Support Opportunities: Scholarships in Brazil - Master