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| Delignification Kinetics of Ethanol Pretreatment of Soybean Stalk |
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| DOI：10.11981/j.issn.1000-6842.2017.01.1 |
| Key Words:soybean stalk; ethanol pretreatment; delignification; kinetics |
| Fund Project:国家自然科学基金(31500496)；湖北省教育厅重点项目(D20161402)；制浆造纸科学与技术教育部重点实验室开放基金(KF201611,KF-201409)。 |
| Author Name | Affiliation | | 樊富广1 | 1.湖北工业大学材料与化学工程学院,湖北武汉,430068 | | 涂洪峰1 | 1.湖北工业大学材料与化学工程学院,湖北武汉,430068 | | 陈从鑫1 | 1.湖北工业大学材料与化学工程学院,湖北武汉,430068 | | 姚 兰1,2 | 1.湖北工业大学材料与化学工程学院,湖北武汉,430068；2.齐鲁工业大学制浆造纸科学与技术教育部重点实验室,山东济南,250353 | | 杨海涛1,2,* | 1.湖北工业大学材料与化学工程学院,湖北武汉,430068；2.齐鲁工业大学制浆造纸科学与技术教育部重点实验室,山东济南,250353 |
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| Abstract: |
| It is an essential step to destroy the structure of the cell wall by pretreatment before enzymatic hydrolysis for the conversion of lignocellulose to ethanol. Ethanol pretreatment has many advantages, and is a hot research topic in recent years. In this experiment, soybean stalk was pretreated under the following condition: heat preservation temperature 170℃, holding time 90 min, ethanol concentration 50%. The component analysis of pretreated material indicated that the hemicellulose and lignin in soybean stalk were mainly removed by ethanol pretreatment (The removal ratio reached 82.9% and 62.0% respectively). Delignification reaction during ethanol pretreatment was a first order reaction. The kinetics study showed that there were two delignification stages i.e. bulk delignification and supplement delignification when the temperature was above 160℃. Lignin was removed 87.9% and 12.1% respectively in the two steps when the temperature was 170℃. The removed lignin in the two stages had different molecular weight (Mw=9101 and 12961). In these two delignification stages, lignin removal rate in bulk delignification stage was higher (kbulk=4×10-4 s-1>ksupplement=4×10-5 s-1)． |
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