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高等学校化学研究 ›› 2011, Vol. 27 ›› Issue (3): 426-430.

• Articles • 上一篇    下一篇

Experimental Researches on Milled Wood Lignin Pyrolysis Based on Analysis of Bio-oil

GUO Xiu-juan, WANG Shu-rong*, WANG Kai-ge and LUO Zhong-yang   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, P. R. China
  • 收稿日期:2010-06-07 修回日期:2010-10-09 出版日期:2011-05-25 发布日期:2011-04-29
  • 通讯作者: WANG Shu-rong E-mail:srwang@zju.edu.cn
  • 基金资助:

    Supported by the National High Technology Research and Development Program of China(No.2009AA05Z407), the International Science and Technology Cooperation Program(No.2009DFA61050), the National Natural Science Foundation (No.90610035), the National Basic Research Program of China(No.2007CB210200) and the Doctoral Foundation of the Ministry of Education of China(No.20090101110034).

Experimental Researches on Milled Wood Lignin Pyrolysis Based on Analysis of Bio-oil

GUO Xiu-juan, WANG Shu-rong*, WANG Kai-ge and LUO Zhong-yang   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, P. R. China
  • Received:2010-06-07 Revised:2010-10-09 Online:2011-05-25 Published:2011-04-29
  • Contact: WANG Shu-rong E-mail:srwang@zju.edu.cn
  • Supported by:

    Supported by the National High Technology Research and Development Program of China(No.2009AA05Z407), the International Science and Technology Cooperation Program(No.2009DFA61050), the National Natural Science Foundation (No.90610035), the National Basic Research Program of China(No.2007CB210200) and the Doctoral Foundation of the Ministry of Education of China(No.20090101110034).

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摘要： The structure of milled wood lignin(MWL), isolated via the Bj?rkman procedure, was studied by means of 1H NMR spectroscopy and Fourier transform infrared spectroscopy, and then its pyrolytic product distribution was investigated on a pyrolysis device. MWL obtained from Manchurian Ash(MA) contained more methoxyl and free phenolic hydroxyl groups per C9 unit than MWL from Mongolian Pine(MP) due to the existence of both guaiacyl and syringyl units, which have a major influence on the pyrolysis behavior of lignin. The results of pyrolysis show that MWL from MA generated a higher yield of bio-oil, mainly composed of phenols, guaiacols, syringols and catechols, and a less yield of char, in addition to the gaseous products CO, CO2, methane and methanol, compared with MWL from MP. Guaiacol and syringol were the typical products from G-lignin and S-lignin, probably attributed to the easier cleavage of the aryl-alkyl linkage in the side chain compared with the C―OCH3 bond in the benzene ring. The degradation of MWL from MP was dominated by the demethylation reaction and the cleavage of aliphatic ―CH2OH at the γ-position, followed by the cracking of the Cα―Cβ and C4―Cα bonds.

关键词: Pyrolysis, Milled wood lignin(MWL), Guaiacyl unit, Syringyl unit

Abstract: The structure of milled wood lignin(MWL), isolated via the Bj?rkman procedure, was studied by means of 1H NMR spectroscopy and Fourier transform infrared spectroscopy, and then its pyrolytic product distribution was investigated on a pyrolysis device. MWL obtained from Manchurian Ash(MA) contained more methoxyl and free phenolic hydroxyl groups per C9 unit than MWL from Mongolian Pine(MP) due to the existence of both guaiacyl and syringyl units, which have a major influence on the pyrolysis behavior of lignin. The results of pyrolysis show that MWL from MA generated a higher yield of bio-oil, mainly composed of phenols, guaiacols, syringols and catechols, and a less yield of char, in addition to the gaseous products CO, CO2, methane and methanol, compared with MWL from MP. Guaiacol and syringol were the typical products from G-lignin and S-lignin, probably attributed to the easier cleavage of the aryl-alkyl linkage in the side chain compared with the C―OCH3 bond in the benzene ring. The degradation of MWL from MP was dominated by the demethylation reaction and the cleavage of aliphatic ―CH2OH at the γ-position, followed by the cracking of the Cα―Cβ and C4―Cα bonds.

Key words: Pyrolysis, Milled wood lignin(MWL), Guaiacyl unit, Syringyl unit