DILUTE ACID HYDROLYSIS OF SWEET SORGHUM BAGASSE AND FERMENTABILITY OF THE HEMICELLULOSIC HYDROLYSATE
DILUTE ACID HYDROLYSIS OF SWEET SORGHUM BAGASSE AND FERMENTABILITY OF THE HEMICELLULOSIC HYDROLYSATE
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DOI：
10.1590/0104-6632.20190361s20170643
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发表时间：
2019-03-01
影响因子：
1.2
通讯作者：
Sene, Luciane
中科院分区：
文献类型：
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作者：
Camargo, Danille;Sydney, Eduardo B.;Sene, Luciane
以甜高粱渣为原料，研究稀酸水解半纤维素生产乙醇的最佳工艺条件。实验遵循具有四个中心点的2（3）析因设计，并且具有变量：硫酸浓度、温度和水解时间。蔗渣的化学组成为：木质素24.77%，半纤维素31.28%，纤维素34.80%。导致最高糖浓度（14.22 g/L木糖和2.42 g/L葡萄糖）的水解为1.75%H2SO4、121 ℃和40分钟。这种相同的条件提供了低浓度的毒性化合物（1.34g/L乙酸、0.90g/L苯酚; 124.54mg/L羟甲基糠醛（HMF）和978 mg/L糠醛）。半纤维素衍生糖的S. stiptis的乙醇产量为22 g/L，Y-P/S为0.40 g/g，Qp为0.34 g/L. h。
This study aimed to determine the best dilute acid hydrolysis condition for the hemicellulosic fraction of sweet sorghum bagasse for ethanol production by Scheffersomyces stipitis. The experiment followed a 2(3) factorial design with four central points, and had as variables: sulfuric acid concentration, temperature and hydrolysis time. Sorghum bagasse presented the following chemical composition: 24.77% of lignin, 31.28% of hemicellulose and 34.80% of cellulose. The hydrolysis that resulted in the highest sugars concentration (14.22 g/L of xylose and 2.42 g/L glucose) was 1.75% H2SO4, 121 degrees C and 40 minutes. This same condition provided low concentrations of toxic compounds (1.34 g/L of acetic acid, 0.90 g/L of phenol; 124.54 mg/L of hydroxymethylfurfural (HMF) and 978 mg/L of furfural). The fermentation of the hemicellulose-derived sugars by S. stiptis resulted in 22 g/L of ethanol, Y-P/S 0.40 g/g and Qp 0.34 g/L.h.