期刊
ENVIRONMENTAL RESEARCH
卷 190, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2020.109976
关键词
Lignin valorization; Chemical composition; Kinetics; Pyrolysis; N-2 flow rate
资金
- Ministry of Science and Technology of Taiwan [MOST 107-2218E-155-001]
- GNin Technology, Taiwan
- Global Connections Fund (Bridging Grant Scheme) of the Australian Academy of Technology and Engineering (ATSE) in 2019
- King Saud University, Riyadh, Saudi Arabia [RSP-2020/6]
Fast pyrolysis of lignin can obtain valuable products such as bio-oil, bio-chemical, syngas, and biochar. In this study, two types of lignin known as brown solid from the byproduct of cellulosic ethanol fermentation and commercial dealkaline lignin from the papermaking process were used for pyrolysis in a 3-L batch reactor at 300-450 degrees C. The product composition in the liquid and gas phases were analyzed by using gas chromatography-mass spectrometry/Flame-ionization detector/thermal conductivity detector (GC-MS/FID/TCD). Increasing the N-2 flow rate to 150 mL/min was sufficient to increase the production of bio-oil/bio-organics up to 15% for brown solid pyrolysis. In contrast, the biochemical production during dealkaline lignin pyrolysis was not sensitive to the change of the N-2 flow rate. The amount of biochar produced in the pyrolysis (similar to 60%) slightly changed at various pyrolysis temperature and gas flow rate, which could be due to the relatively low pyrolysis temperature that was insufficient to decompose the lignin. The GC-MS analysis also revealed that C7-C8 compounds, which represented the phenolic compounds, were the most abundant in the liquid products. Kinetic models of the pyrolysis were established based on the thermogravimetric analysis.
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