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bce ›› 2018, Vol. 52 ›› Issue (2): 35-41.doi: 10.3969/j.issn.1673-5854.2018.02.007

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Mechanism Study of Black Liquor Alkali Lignin Pyrolysis by Using TG-FTIR

TAN Yang1, MA Chunfu2   

  1. 1. Yantai Institute of Coastal Zone Research Chinese Academy of Sciences, Yantai 264003, China;
    2. Yantai University, Yantai 264003, China
  • Received:2017-03-15 Online:2018-03-30 Published:2018-04-03

Abstract: The TG-FTIR technique was used to investigate the pyrolysis characteristics of black liquor alkali lignin as well as its gas products. The results revealed that the pyrolysis process of alkali lignin comprised three stages and it mainly occurred at the temperature range from 200 to 500℃. The pyrolysis reaction of alkali lignin could be described by first-order reaction kinetics model and the apparent activation energies calculated by Coats-Redfern model were from 39.3 to 43.1 kJ/mol at different heating rates. The gas products of pyrolysis analyzed by FTIR contained H2O, CO2, CO, CH4, methanol, phenols and N2O, in which CH4, methanol, phenols and N2O were mainly released at the temperature range from 300 to 500℃ and the maximal yields of these gas products were obtained at about 420℃.

Key words: alkali lignin, pyrolysis, kinetics, TG-FTIR

CLC Number: