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| Delignification Kinetics of Alkaline and Ethanol Pretreatment of Broussonetia papyrifera |
| Received:July 26, 2019 |
| DOI：10.11981/j.issn.1000-6842.2020.04.15 |
| Key Words:Broussonetia papyrifera;ethanol pretreatment;alkaline pretreatment;delignification;kinetics |
| Fund Project:国家自然科学基金（21978074，31500496）；2016 年大学生创新创业湖北工业大学省级项目（201610500020）。 |
| Author Name | Affiliation | Postcode | | XIONG Long | School of Material and Chemical Engineering， Hubei University of Technology， Wuhan， Hubei Province， 430068 | 430068 | | TU Hongfeng | School of Material and Chemical Engineering， Hubei University of Technology， Wuhan， Hubei Province， 430068 | 430068 | | ZHENG Fangke | School of Material and Chemical Engineering， Hubei University of Technology， Wuhan， Hubei Province， 430068 | 430068 | | YAO Lan | School of Material and Chemical Engineering， Hubei University of Technology， Wuhan， Hubei Province， 430068 | 430068 | | XIE Yimin | School of Material and Chemical Engineering， Hubei University of Technology， Wuhan， Hubei Province， 430068 | 430068 | | YANG Haitao | School of Material and Chemical Engineering， Hubei University of Technology， Wuhan， Hubei Province， 430068 | 430068 |
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| Abstract: |
| The kinetic characteristics of delignification of Broussonetia papyrifera pretreated by sodium hydroxide and ethanol were analyzed in this study to compare their differences in delignification rate and activation energy. Results showed that delignification reactions during alkaline and ethanol pretreatment were a first order reaction. There were two delignification stages during both pretreatment processes， i.e.， bulk delignification and supplement delignification. During the pretreatments with alkaline and ethanol， it entered the supplementary delignification stage as the temperatures were higher than 130℃ and 150℃， respectively. The delignification rate was increased with the increase of pretreatment temperature， and the delignification rate in the bulk delignification stage was higher than that of the supplementary delignification stage. Comparing the delignification kinetics of the two pretreatment processes， it was found that the delignification rates were almost the same at low temperature， while the delignification rate of the alkali pretreatment was slightly higher than that of the ethanol pretreatment at medium and high temperature. It was also found that the activation energies of alkaline and ethanol pretreatments were 100.2 kJ/mol and 82.3 kJ/mol respectively in bulk delignification stages， which indicated that in present study， lignin was easier to be removed during ethanol pretreatment process. |
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