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Structure and Pyrolysis Characteristics of Lignin Derived from Wood Powder Hydrolysis Residues |
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| Authors: | Bin Zhang Xiuli Yin Chuangzhi Wu Zejing Qiu Congwei Wang Yanqin Huang Longlong Ma Shubin Wu |
| Institution: | 1. Key Lab of Renewable Energy and Natural Gas Hydrate, Chinese Academy of Sciences, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China 2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, China 3. State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China |
| Abstract: | Physicochemical characteristics of wood powder acid hydrolysis residue (WAHR) were studied firstly in this study, and WAHL (lignin derived from WAHR) was separated successfully from WAHR based on an improved isolating method. The content of functional group such as phenolic hydroxyl group of guaiacyl, syringyl, and hydroxyl?Cphenyl units in WAHL were identified by 31P-NMR and DFRC (derivatization followed by reductive cleavage) method. Thermal degradation experiments were carried out on a thermogravimetric (TG) analyzer to show pyrolysis characteristics of WAHL. The compositions of pyrolysis products of WAHL were also studied throughout a pyrolysis?Cgas chromatography?Cmass spectrometry (Py?CGC?CMS) analyzer. It was shown that the pyrolysis of WAHL took place in a wide temperature range and there were two obvious peaks in the differential thermogravimetric diagram. Results of Py?CGC?CMS analysis indicated that pyrolysis products were mainly formed through cleavage of the ??-O-4 connection and multiple pyrolysis. |
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