AI Article Synopsis
- The study explores the fast pyrolysis of two types of lignin (brown solid from ethanol byproduct and commercial dealkaline lignin) to produce valuable products like bio-oil, biochemical, syngas, and biochar in a batch reactor at 300-450 °C.
- Results showed that increasing the nitrogen flow rate improved bio-oil yield for brown solid lignin, while the dealkaline lignin yield remained stable regardless of nitrogen flow changes.
- The analysis indicated that about 60% of the output was biochar, and the main liquid products were C7-C8 phenolic compounds, with pyrolysis kinetics modeled based on thermogravimetric data.
Article Abstract
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 °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 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 flow rate. The amount of biochar produced in the pyrolysis (~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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| http://dx.doi.org/10.1016/j.envres.2020.109976 | DOI Listing |
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