High efficient ethanol production from corn stover by modified mild alkaline pretreatment
High efficient ethanol production from corn stover by modified mild alkaline pretreatment
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DOI：
10.1016/j.renene.2021.02.002
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发表时间：
2021-02-15
期刊：
影响因子：
8.7
通讯作者：
Galbe, Mats
中科院分区：
文献类型：
--
作者：
Molaverdi, Maryam;Karimi, Keikhosro;Galbe, Mats
采用碳酸钠预处理法对玉米秸秆固态酒精生产进行了研究。为了进一步提高处理后的CS的乙醇产量，特别是在低酶载量的情况下，开发了一种包括水蒸气和碳酸钠预处理的联合预处理方法。通过碳酸钠预处理(100℃，3h)去除/修饰木质素有助于在高固体分、低酶载量下获得高的乙醇效价。在30%固形物浓度和15fPU/g酶负荷下，用碳酸钠不混合预水解72h后，CS的最高乙醇浓度为44g/L。采用预水解工艺和延长浸提时间至120h可使乙醇浓度分别提高到59g/L和67g/100g。在190℃的水蒸气处理10min后，碳酸钠处理可使乙醇浓度增加76%。在酶负荷仅为5ffu/g底物的情况下，与碳酸钠预处理相比，改良前处理的乙醇浓度从24g/L提高到41g/L。结果表明，在高固体分、低酶负荷条件下，半纤维素的水蒸气脱除和碳酸钠的脱木素处理可显著提高乙醇浓度。(C)2021年爱思唯尔有限公司。保留所有权利。
Sodium carbonate pretreatment, an environmentally-friendly and efficient pretreatment, was used to improve solid-state ethanol production from corn stover (CS). To further enhance ethanol yield from the pretreated CS, especially at low enzyme loadings, a combined pretreatment, including steam and sodium carbonate pretreatments, was developed. The removal/modification of lignin by sodium carbonate pretreatment (at 100 degrees C for 3 h) helped to obtain high ethanol titer at high solids and low enzymes loadings. The maximum ethanol concentration was about 44 g/L, obtained after 72 h simultaneous saccharification and fermentation (SSF) of CS pretreated with sodium carbonate without mixing and prehydrolysis at 30% solid and 15 FPU/g enzyme loadings. Applying prehydrolysis and increasing the SSF time to 120 h improved ethanol concentration to 59 and 67 g/L, respectively. Steam pretreatment at 190 degrees C for 10 min before sodium carbonate pretreatment led to 76% increase in ethanol concentration. At the enzyme loading of only 5 FPU/g substrate, the modified pretreatment increased the ethanol concentration from 24 g/L to 41 g/L, compared with that of sodium carbonate pretreatment. The results showed that hemicellulose removal and delignification by steam and sodium carbonate pretreatment, respectively, considerably improved ethanol concentration at high solids and low enzyme loadings. (C) 2021 Elsevier Ltd. All rights reserved.