Extraction and characterization of the lignin from rice straw by sulfuric acid

doi:10.3969/j.issn.1000-1565.2016.05.005

Abstract

Abstract: In this work,lignin was extracted from rice straw by sulfuric acid.The brown lignin was obtained through extraction by 72% H₂SO₄ for 2 h at room temperature and the ratio of liquid to solid was 15.The content of lignin in rice straw was 9.23%.The lignin was analyzed using scanning electron microscope(SEM),thermogravimetric analysis and differential scanning calorimetry(TG-DSC),Fourier transform infrared spectroscopy(FT-IR)and proton nuclear magnetic resonance(¹H-NMR).It was showen that the lignin was irregular block,its surface was rough and lacunaris,and it had a good thermal stability,and the decomposition temperature of lignin was between 175 ℃ and 700 ℃.It contained many functional groups like hydroxyl,carbonyl,ether linkage and benzene ring structure and was composed of p-hydroxyphenyl lignin,guaiacyl lignin and syringyl lignin.

Key words: lignin, rice straw, sulfuric acid separation, characterization

CLC Number:

O636.2

ZHANG Baoping,YANG Fang,MA Zhongchen,GUO Meichen,LIU Yun. Extraction and characterization of the lignin from rice straw by sulfuric acid[J]. Journal of Hebei University (Natural Science Edition), 2016, 36(5): 474-479.

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