Steam pretreatment of H2SO4-impregnated Salix for the production of bioethanol

In the bioconversion of lignocellulosic materials to ethanol, pretreatment of the material prior to enzymatic hydrolysis is essential to obtain high overall yields of sugar and ethanol. In this study, steam pretreatment of fast-growing Salix impregnated with sulfuric acid has been investigated by va...

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Bibliographic Details
Published in:	Bioresource technology Vol. 99; no. 1; pp. 137 - 145
Main Authors:	Sassner, P, Mårtensson, C.G, Galbe, M, Zacchi, G
Format:	Journal Article
Language:	English
Published:	Oxford Elsevier Science 2008
Subjects:	Biofuel production Biological and medical sciences Biotechnology biotransformation chemical composition Chemical Engineering chemical treatment Energy Engineering and Technology enzymatic enzymatic hydrolysis ethanol ethanol production Fundamental and applied biological sciences. Psychology glucose hydrolysis Industrial applications and implications. Economical aspects Kemiteknik lignin lignocellulose Methods. Procedures. Technologies Microbial engineering. Fermentation and microbial culture technology renewable energy sources saccharification Salix steam pretreatment sugars sulfuric acid Teknik willow wood xylose Steam pretreatment Ethanol Enzymatic hydrolysis Ethanol production Biofuel Woody plant Water vapor Salicaceae Sulfuric acid Hydrolysis Salix Alcoholic fermentation Willow Dicotyledones Angiospermae Enzymatic digestion Spermatophyta Pretreatment
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Summary:	In the bioconversion of lignocellulosic materials to ethanol, pretreatment of the material prior to enzymatic hydrolysis is essential to obtain high overall yields of sugar and ethanol. In this study, steam pretreatment of fast-growing Salix impregnated with sulfuric acid has been investigated by varying the temperature (180-210 °C), the residence time (4, 8 or 12 min), and the acid concentration (0.25% or 0.5% (w/w) H2SO4). High sugar recoveries were obtained after pretreatment, and the highest yields of glucose and xylose after the subsequent enzymatic hydrolysis step were 92% and 86% of the theoretical, respectively, based on the glucan and xylan contents of the raw material. The most favorable pretreatment conditions regarding the overall sugar yield were 200 °C for either 4 or 8 min using 0.5% sulfuric acid, both resulting in a total of 55.6 g glucose and xylose per 100 g dry raw material. Simultaneous saccharification and fermentation experiments were performed on the pretreated slurries at an initial water-insoluble content of 5%, using ordinary baker's yeast. An overall theoretical ethanol yield of 79%, based on the glucan and mannan content in the raw material, was obtained.
Bibliography:	http://dx.doi.org/10.1016/j.biortech.2006.11.039
ISSN:	0960-8524 1873-2976 1873-2976
DOI:	10.1016/j.biortech.2006.11.039