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| Investigation of Lignin Deposition Morphology on the Fibers of Wheat Straw Subjected to Hydrothermal-Ethanol Two-Step Fractional Separation |
| Received:July 20, 2019 |
| DOI：10.11980/j.issn.0254-508X.2019.11.002 |
| Key Words:wheat straw hydrothermal treatment ethanol treatment lignin coated |
| Fund Project:国家“十三五”重点研发计划项目
2017YFB0307901
;
陕西省重点研发计划项目
2017ZDXM-SF-090
2018ZDXL-N-19-1
国家“十三五”重点研发计划项目（2017YFB0307901）；陕西省重点研发计划项目（2017ZDXM-SF-090）、（2018ZDXL-N-19-1）。 |
| Author Name | Affiliation | Postcode | | LI Jinbao | College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental
Light Chemistry Engineering Education,Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper,Shaanxi University of Science &
Technology, Xi'an, Shaanxi Province, 710021 | 710021 | | FENG Pan | College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental
Light Chemistry Engineering Education,Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper,Shaanxi University of Science &
Technology, Xi'an, Shaanxi Province, 710021 | 710021 | | XIU Huijuan | College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental
Light Chemistry Engineering Education,Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper,Shaanxi University of Science &
Technology, Xi'an, Shaanxi Province, 710021 | 710021 | | LI Jingyu | College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental
Light Chemistry Engineering Education,Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper,Shaanxi University of Science &
Technology, Xi'an, Shaanxi Province, 710021 | 710021 | | SONG Te | College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental
Light Chemistry Engineering Education,Shaanxi Province Key Lab of Papermaking Technology and Specialty Paper,Shaanxi University of Science &
Technology, Xi'an, Shaanxi Province, 710021 | 710021 | | LI Xiang | Engineering Center of Agriculture and Forestry Technology Extension， Shaanxi University of Science &
Technology, Xi'an, Shaanxi Province, 710021)
(*E-mail: lijinbao@sust.edu.cn | 710021 |
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| Abstract:In this paper, the effects of hydrothermal-ethanol two-step treatment on the separation of wheat straw components were studied, and the changes of lignin deposition morphology were investigated by field emission scanning electron microscope, atomic force microscopy and X-ray photoelectron spectrometer. The results showed that the removal rate of hemicellulose by hydrothermal-ethanol two-step process was as high as 94.2%, but the removal rate of lignin was only 41.5%; it was closely related to the deposition of lignin on the surface of the fiber, some lignin was deposited as particles on the surface of the solid residues after hydrothermal treatment, and this part of the deposited lignin could not be solved by ethanol, the second step ethanol treatment changed the morphology of the deposited lignin, from granular lignin into a coating layer adsorbed on the surface of the fiber ,which resuled in low removal rate of lignin in hydrothermal-ethanol two-step treatment process. |
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