Improvement of cassava stem hydrolysis by two-stage chemical pretreatment for high yield cellulosic ethanol production

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• 作者：Bunpot Klinpratoom (1) (2)
  Anissara Ontanee (1)
  Chalerm Ruangviriyachai (1) (2)
  
  1. Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC) ; Faculty of Science ; Khon Kaen University ; Khon Kaen ; 40002 ; Thailand
  2. National Research University Project of Thailand ; Biofuel Cluster ; Khon Kaen University ; Khon Kaen ; 40002 ; Thailand
  
• 关键词：Cassava Stem ; Two ; stage Pretreatment ; Response Surface Methodology ; Reducing Sugar ; Cellulosic Ethanol
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：32
• 期：3
• 页码：413-423
• 全文大小：560 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Industrial Chemistry and Chemical Engineering
  Catalysis
  Materials Science
  Biotechnology
  
• 出版者：Springer New York
• ISSN：1975-7220

文摘

We used sodium chlorite followed by sodium hydroxide as a two-stage pretreatment of cassava stem for removal of lignin and hemicellulose to obtain a substrate with high cellulose content prior to hydrolysis. Response surface methodology was applied to determine the optimum hydrolysis conditions of two-stage pretreated cassava stem. After pretreatment, the cellulose content of cassava stem increased from 42.10% to 86.45%, concomitant with decreases in lignin (87.59%) and hemicellulose (78.18%) content. Acid hydrolysis of two-stage pretreated cassava stem under optimum conditions allowed obtaining a hydrolyzate rich in reducing sugar, with a yields up to 67.37%. Conversely, inhibitors were detected at very low concentrations. The fermentation of the hydrolyzate resulted in an ethanol yield of 22.58 g/100 g substrate corresponding to a theoretical ethanol yield of 84.41%. The results demonstrate that two-stage pretreatment is effective for improving cellulose hydrolyzability, resulting in high fermentable sugar and low fermentation inhibitor concentrations.