| 樊富广,涂洪峰,陈从鑫,姚 兰,杨海涛.大豆秸秆乙醇预处理脱木素动力学研究[J].中国造纸学报,2017,32(1):1-6 |
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| 大豆秸秆乙醇预处理脱木素动力学研究 |
| Delignification Kinetics of Ethanol Pretreatment of Soybean Stalk |
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| DOI：10.11981/j.issn.1000-6842.2017.01.1 |
| 中文关键词: 大豆秸秆 乙醇预处理 脱木素 动力学 |
| Key Words:soybean stalk ethanol pretreatment delignification kinetics |
| 基金项目: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)。 |
| 作者 | 单位 | | 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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| 中文摘要: |
| 在保温温度170℃、保温时间90 min、乙醇浓度50%的条件下对大豆秸秆进行乙醇预处理,并对预处理后大豆秸秆进行成分分析,发现乙醇预处理主要脱除了大豆秸秆中的半纤维素和木素(脱除率分别为82.9%和62.0%)。动力学研究发现,乙醇预处理脱木素反应为一级反应,脱木素过程由大量脱木素段和补充脱木素段组成,且预处理反应进入补充脱木素段的温度要高于160℃。在保温温度为170℃时,大量脱木素段和补充脱木素段的木素脱除率分别为87.9%和12.1%。大量脱木素段主要脱除的是小分子木素(相对分子质量为9101)；而补充脱木素段脱除的木素的相对分子质量较大,达到12961。对比2个阶段的木素脱除速率发现,大量脱木素段的脱除速率(k大=4×10-4 s-1)高于补充脱木素段(k补=4×10-5 s-1),说明大量脱木素段木素脱除速率较快。 |
| 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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