| Solvent-enhanced Depolymerization of Lignin under Microwave Irradiation |
| Received:January 29, 2016 Click here to download the full text |
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| Author Name | Affiliation | E-mail | | Wang Wenliang* | National Demonstration Center for Experimental Light Chemistry Engineering Education (Shaanxi University of Science & Technology), Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Key Laboratory of Paper based Functional Materials of China National Light Industry, College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China
Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education, Qilu University of Technology (Shandong Academy of Sciences), Ji'nan, Shandong Province, 250353, China | wangwenliang@sust.edu.cn | | Huang Jiale | National Demonstration Center for Experimental Light Chemistry Engineering Education (Shaanxi University of Science & Technology), Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Key Laboratory of Paper based Functional Materials of China National Light Industry, College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China | | | Zhao Xingjin | National Demonstration Center for Experimental Light Chemistry Engineering Education (Shaanxi University of Science & Technology), Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Key Laboratory of Paper based Functional Materials of China National Light Industry, College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China | | | Ren Xiaoxiao | National Demonstration Center for Experimental Light Chemistry Engineering Education (Shaanxi University of Science & Technology), Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Key Laboratory of Paper based Functional Materials of China National Light Industry, College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China | | | Miao Hui | National Demonstration Center for Experimental Light Chemistry Engineering Education (Shaanxi University of Science & Technology), Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, Key Laboratory of Paper based Functional Materials of China National Light Industry, College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province, 710021, China | |
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| Abstract:Lignin is considered an ideal natural material for the production of sustainable monophenols. In this study, a microwave-assisted depolymerization (MAD) strategy was developed. The introduction of solvent vapors in the dynamic vapor flow reaction system was performed to enhance the lignin conversion efficiency. The results showed that no liquid products were generated from the MAD of lignin without solvent vapors. With the introduction of solvents (CH3OH, HCHO, HCOOH, and CH2Cl2), liquid products appeared (especially with CH2Cl2, which had the highest yield of 41.9 wt%). Results from gas chromatography/mass spectrometry of liquid products showed that seven kinds of compounds, including guaiacols, phenols, syringols, methoxyphenyls, heterocycles, esters, and aromatics were identified. CH2Cl2 can significantly enhance the production of monophenols (guaiacols, phenols, and syringols). The introduction of these solvent vapors can also facilitate the generation of porous char with high Brunauer-Emmett-Teller specific surface areas. Some carbon nanospheres deposited on the surface of the char were obtained with the assistance of CH2Cl2. This study provides a facile method for the utilization of lignin in the field of bio-based fine chemicals. |
| keywords:lignin microwave solvent monophenols porous char |
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