Extraction and characterization of the lignin from rice straw by sulfuric acid
In this work,lignin was extracted from rice straw by sulfuric acid.The brown lignin was ob-tained through extraction by 72% H2 SO4 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 micro-scope(SEM),thermogravimetric analysis and differential scanning calorimetry (TG-DSC),Fourier trans-form infrared spectroscopy (FT-IR)and proton nuclear magnetic resonance (1 H-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-hydroxy-phenyl lignin,guaiacyl lignin and syringyl lignin.
NETL
NSTL
万方数据
维普
