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Chemistry and Industry of Forest Products ›› 2021, Vol. 41 ›› Issue (6): 36-42.doi: 10.3969/j.issn.0253-2417.2021.06.005

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Pyrolysis Behavior Analysis of Enzymolysis Lignin Based on TG-FTIR-MS Technology

Xinglong HOU1,2, Xiaopeng JIAN1,2, Wei XU1, Qi GUO1, Junli LIU1,*()   

  1. 1. Institute of Chemical Industry of Forest Products, CAF; National Engineering Lab. for Biomass Chemical Utilization; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China
    2. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
  • Received:2021-05-11 Online:2021-12-28 Published:2021-12-31
  • Contact: Junli LIU E-mail:liujunli1974@126.com


The thermogravimetric analysis of enzymolysis lignin(EL) and phosphoric acid impregnated enzymolysis(EL-P) lignin was carried out at constant heating speed and variable heating speed to simulate the preparation conditions of activated carbon and provide a theoretical basis for analysis. The constant heating speed thermogravimetric experiments found that the EL pyrolysis process mainly occurred at 300-360 ℃, the EL-P pyrolysis temperature was advanced, which proved that phosphoric acid would interact with EL at low temperature. Variable heating speed increased the pyrolysis reaction time of lignin. The main weight loss peaks in the constant-rate heating process of EL split into two weight loss peaks, and the pyrolysis of lignin was more complete. The residual amount of EL-P pyrolysis products was reduced from 57.42% at the constant heating speed to 39.93% at the variable weating speed. Compared with constant speed pyrolysis, variable speed pyrolysis added the constant temperature process, the final pyrolysis residue decreased, more substances were released as gas, which indicated that the pyrolysis reaction was more sufficient. It verified the necessity of holding a constant temperature for a period of time during the impregnation and activation stages of the activated carbon preparation process. The chemical analysis of the released components showed that the pyrolysis of ligin mainly included CO, CO2, CH4, methanol, propionaldehyde and aromatic compound and so on. After H3PO4 impregnation, the content of pyrolysis products of EL-P reduced and the components were roughly the same.

Key words: phosphoric acid, enzymatic hydrolysis of lignin, TG-FTIR-MS

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