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Biomass Chemical Engineering ›› 2022, Vol. 56 ›› Issue (4): 67-76.doi: 10.3969/j.issn.1673-5854.2022.04.009

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Research Progress on Lignin Depolymerization and Liquid Phase Catalytic Degradation

Haohan JIANG, Shuangming LI(), Sansan YU   

  1. College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
  • Received:2021-05-06 Online:2022-07-30 Published:2022-07-23
  • Contact: Shuangming LI E-mail:lishuangming@syuct.edu.cn

Abstract:

As the most abundant renewable resource on the earth, lignocellulosic biomass not only has huge reserves but also has a significant advantage on carbon balance in the utilization process. It has gradually become one of the most promising renewable energy sources. Among the lignocellulose lignin is the largest and only renewable aromatic compound raw material in the nature. It plays a very important role in the conversion of biomass fuels, especially the depolymerization production of benzene chemical products. Based on the brief chemical structure description of lignin, this paper summarized the depolymerization methods of lignin in recent years, such as high-temperature thermal depolymerization, biological enzyme depolymerization, catalytic thermal depolymerization, photocatalytic depolymerization, and solvent pyrolysis. The mechanism, advantages and disadvantages of acid and alkali catalytic system as well as hydrogenation and oxidation catalytic system in the process of liquid-phase catalysis were deeply analyzed. Additionally, the problems existed in the depolymerization methods of lignin at this stage were also summarized, and the developing direction in the future was proposed.

Key words: biomass, lignin, depolymerization, catalyze

CLC Number: