Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (8): 1-6.doi: 10.3969/j.issn.1000-565X.2010.08.001

• Chemistry & Chemical Engineering •     Next Articles

Chemical Structure and Thermochemical Properties of Lignin from Herbaceous Plant

Lou Rui  Wu Shu-bin  Lv Gao-jin  Yang Qing   

  1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-10-20 Revised:2010-01-09 Online:2010-08-25 Published:2010-08-25
  • Contact: 武书彬（1965-），男，教授，博士生导师，主要从事生物质化学与化工、二次纤维利用新技术等的研究．E-mail：shubinwu@scut．edu．cn E-mail:lou．rui@mail．scut．edu．cn
  • About author:娄瑞（1983-），女，博士生，主要从事植物纤维热化学转化燃料能源的研究
  • Supported by:

    国家“973”计划项目（2007CB210201）;国家“863”计划项目（2007AA052456）;国家自然科学基金资助项目（20576043）

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Abstract:

Two representative herbaceous plants, namely, rice straw and bamboo, were selected as the materials to produce two kinds of enzymatic/mild acidolysis lignin （EMAL） by isolating lignin via an enzymatic/mild acidolysis process. Then, the chemical structure and properties of the products were characterized by means of elemental analysis, FT-IR and quantitative 31p-NMR, and the pyrolysis characteristics of the products were investigated by means of TG-FTIR and Py-GC/MS. The results show that （ 1 ） rice straw contains more pentosan and extractives while bamboo contains more cellulose and lignin; （2） guaiacyl units （G type） are abundant in rice straw EMAL while bamboo EMAL possesses more syringyl units （S type） ; （3） during the thermal degradation, there is one distinct weight loss peak at 384℃ in bamboo EMAL but two at 270℃ and 384℃ in rice straw EMAL;and （4） the difference in chemical structure greatly affects thermal decomposition behaviors as well as pyrolysis products of EMAL.

Key words: herbaceous plant, lignin, pyrolysis, thermochemistry, TG-FTIR, Py-GC/MS