Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (6): 22-26.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Thermogravimetric Characteristics and Kinetic Analysis of Lignin Hydrolyzed by Dilute Acid

Tan Yang  Wu Shu-bin  Lou Rui  Yang Qing   

  1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2008-07-02 Revised:2008-09-17 Online:2009-06-25 Published:2009-06-25
  • 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研究．E-mail：shubinwu@scut．edu．cn E-mail:tan．yang@mail．scut．edu．cn
  • About author:谭扬（1980-），女，博士生，主要从事植物纤维热化学转化研究．
  • Supported by:

    国家重点基础研究发展计划项目（2007CB210201）;国家自然科学基金资助项目（20576043）;中国科学院可再生能源与天然气水化合物重点实验室基金资助项目（0807K1）

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Abstract:

The pyrolysis characteristics of lignin hydrolyzed by dilute acid at different heating rates were investigated by means of thermogravimetry, and the effect of heating rate on the pyrolysis was analyzed. Afterwards, a dynamic model describing the pyrolysis process was established according to the differential thermogravimetric curves, and the corresponding kinetic parameters were calculated. The results show that   the pyrolysis mainly occurs at 200 - 450 ℃ ;   with the increase of heating rate, the thermogravimetric curve shifts to the high-temperature range;   at the heating rates of 10, 20 and 30 ℃/min, the mass loss reaches the peak value at 311.9, 323.8 and 338.1℃, respectively, with only one obvious mass loss peak occurring at the differential thermogravimetric curves;   according to the Coats-Redfern method, the pyrolysis can be described by two first-order reactions; and   the activation energy, 18.27 - 18.47 kJ/mol at low-temperature range and 74. 45 - 84.37 kJ/mol at high- temperature range, slightly decreases with the increase of heating rate.

Key words: lignin, pyrolysis, thermogravimetric analysis, kinetics