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Chemistry and Industry of Forest Products ›› 2014, Vol. 34 ›› Issue (4): 83-89.doi: 10.3969/j.issn.0253-2417.2014.04.014

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Pyrolysis Characteristics of Main Organic Components in Eucalypt APMP Pulping Spent Liquor

LI Xiao-hong, WU Shu-bin, ZHAO Yu-shuang   

  1. State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2013-05-13 Online:2014-08-25 Published:2015-08-18
  • Contact: 武书彬(1965-),男,教授,博士生导师,主要从事植物纤维类生物质化学结构、植物纤维类生物质转化为清洁能源和化工原料等方面的研究;E-mail:shubinwu@scut.edu.cn。 E-mail:shubinwu@scut.edu.cn

Abstract: The eucalypt alkaline peroxide mechanical pulp (APMP) spent liquor solid (ASLS) and its three major organic components, i.e., alkali lignin(AL), polysaccharide(PLS) and lignin-carbohydrate complexes(LCC), were rapidly pyrolyzed at the temperature from 400℃ to 800℃ through a tubular furnace. The composition and distribution of the pyrolysis products were determined by gas chromatography (GC), gas chromatography coupled with mass spectrometry (GC/MS), Fourier transforms infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM), respectively. It was found that AL showed a significant effect on the yield of liquid products while PLS exhibited a remarkable influence on the yield of solid and gas products as ASLS was pyrolyzed. The yield of H2 was as high as ASLS was pyrolyzed. It indicated no relation with the contents of AL, LCC and PLS. A large amount of CO was generated as PLS was pyrolyzed at high temperature. In contrast to ASLS, LCC and PLS, more hydrocarbon was generated as AL was pyrolyzed. Aromatics of ASLS pyrolysis liquid products were mainly from AL. And the pyrolysis of AL and LCC should be responsible for the generation of phenols and PAHs. Ketones, furans and acids were attributed to the pyrolysis of AL, LCC and PLS. The surface morphologies of ASLS, AL, LCC and PLS pyrolysis char were significantly different.

Key words: eucalypt, alkali lignin, lignin-carbohydrate complexes, polysaccharide, pyrolysis

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