BioChem - DOS

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

Fuel

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

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 1h reaction time. C5 fermentation experiments showed that the detoxified post-hydrolysates fermented with ethanol yields ranging from 0.10 to 0.31gethanol g<SUP>-1</SUP> reducing sugars. Most samples were fermented from 48 to 72h of experiment with productivities ranging from 0.02 to 0.43g.L<SUP>-1</SUP>.h<SUP>-1</SUP>.

2016

Butterworths [etc.] ; Elsevier Science Ltd

0016-2361

185

pp.73-84

10.1016/j.fuel.2016.07.069

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART76273318

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