Department of Environmental Sciences and Biotechnology, Hallym University, Chuncheon 24252, Republic of Korea.
Clean Energy Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea; Department of Clean Energy and Chemical Engineering, Korea University of Science and Technology, Daejeon 34113, Republic of Korea.
Bioresour Technol. 2016 Nov;219:371-377. doi: 10.1016/j.biortech.2016.08.001. Epub 2016 Aug 2.
Lignin pyrolysis chemistry was investigated via the analysis of the products obtained from the fast pyrolysis of a pine wood at different temperatures. Methoxy phenols, such as guaiacols and eugenols, were produced mainly at 375 and 475°C, while non-methoxy phenols, such as alkyl phenols and pyrocatechols were dominant at 525 and 575°C. At 575°C, aromatic hydrocarbons were formed together with larger amounts of light hydrocarbon gases. When the temperature was increased from 375 and 475°C, the yield of pyrolytic lignin was increased, whereas its average molecular weight was decreased. At 525°C, smaller molecular pyrolytic lignin with a maximum concentration of phenolic hydroxyl groups was produced due to the increased secondary cracking of the reaction intermediates. On the other hand, at 575°C, larger molecular pyrolytic lignin with smaller amounts of phenolic hydroxyl groups was produced due to the increased condensation activity of the pyrolysis reaction intermediates.
通过分析松木在不同温度下快速热解得到的产物，研究了木质素的热解化学。在 375 和 475°C 时主要生成甲氧基酚，如愈创木酚和丁香酚，而在 525 和 575°C 时主要生成非甲氧基酚，如烷基酚和邻苯二酚。在 575°C 时，与大量轻烃气体一起形成芳烃。当温度从 375 和 475°C 升高时，热解木质素的产率增加，但其平均分子量降低。在 525°C 时，由于反应中间体的二次裂解增加，生成了具有最大酚羟基浓度的较小分子量的热解木质素。另一方面，在 575°C 时，由于热解反应中间体的缩合活性增加，生成了具有较少酚羟基的较大分子量的热解木质素。
