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《Acta Energiae Solaris Sinica》 2005-04
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THE CHEMICAL STRUCTURES AND THERMOCHEMICAL PROPERTIES OF WHEAT STRAW LIGNIN

Li Mengshi,Wu Shubin ( State Key Lab of Pulp and Paper Engineering, South China Univ. of Tech., Guangzhou 510640, China)  
The wheat straw traditional MWL (Milled wood lignin) and new EAL (Enzymatic hydrolysis/mild acidolysis lignin) were isolated. The functional groups content, β aryl-ether bonds content and the linkage types, DBDO (dibenzod-ioxocins) structures were determined with quantitative 31P-NMR, DFRC (Derivatization Followed by Reductive Cleavage) . Meanwhile, the thermochemical characteristics of wheat straw MWL, EAL and TAL were evaluated by thermogravimetry. Results showed that: EAL has high yield and purity, and the isolating proceeding procedure is simple, which has good representation of the wheat straw native lignin. The total β aryl-ether bonds content of EAL is 0.811mmol/L, which mainly originated from the phenolic hydroxyl group of guaiacyl and syringyl units. Wheat straw lignin has three kinds of DBDO new structures, their content are 0.244mmol/L. The pyrogenation property of MWL and EAL has not obviously difference. However, the pyrogenation property of TAL is much different from the others two lignin.
【Fund】: 国家自然科学基金项目(30371138) 中科院广州化学所纤维素化学重点实验室访问学者基金(创-109) 教育部留学回国科研启动基金(教外司留[2003]406号) 制浆造纸工程国家重点实验室开放基金(编0217)
【CateGory Index】: O636.2
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