华南理工大学学报(自然科学版) ›› 2010, Vol. 38 ›› Issue (8): 1-6.doi: 10.3969/j.issn.1000-565X.2010.08.001

• 化学化工 •    下一篇

草本类木素的化学与热化学性质表征

娄瑞 武书彬 吕高金 杨卿   

  1. 华南理工大学 制浆造纸工程国家重点实验室, 广东 广州 510640
  • 收稿日期:2009-10-20 修回日期:2010-01-09 出版日期:2010-08-25 发布日期:2010-08-25
  • 通信作者: 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的研究.E-mail:shubinwu@scut.edu.cn E-mail:lou.rui@mail.scut.edu.cn
  • 作者简介:娄瑞(1983-),女,博士生,主要从事植物纤维热化学转化燃料能源的研究
  • 基金资助:

    国家“973”计划项目(2007CB210201);国家“863”计划项目(2007AA052456);国家自然科学基金资助项目(20576043)

Chemical Structure and Thermochemical Properties of Lignin from Herbaceous Plant

Lou Rui  Wu Shu-bin  Lv Gao-jin  Yang Qing   

  1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-10-20 Revised:2010-01-09 Online:2010-08-25 Published:2010-08-25
  • 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的研究.E-mail:shubinwu@scut.edu.cn E-mail:lou.rui@mail.scut.edu.cn
  • About author:娄瑞(1983-),女,博士生,主要从事植物纤维热化学转化燃料能源的研究
  • Supported by:

    国家“973”计划项目(2007CB210201);国家“863”计划项目(2007AA052456);国家自然科学基金资助项目(20576043)

摘要: 以草本类植物中的稻草和毛竹为原料,采用酶解/温和酸解法来分离草本类木素,制得酶解/温和酸解木素(EMAL).运用元素分析、傅里叶变换红外光谱(FT—IR)和核磁共振定量磷谱(31P—NMR)等手段对两种EMAL的化学结构和性能进行表征,同时利用热重一傅里叶红外光谱联用(TG—FFIR)和热解一气相色影质谱联用(Py-GC/MS)技术研究EMAL的热裂解特性.发现:稻草的聚戊糖和抽出物含量较高,而毛竹的纤维素和木素含量较高;稻草EMAL含有丰富的愈创木基(G型)结构单元,毛竹EMAL主要以紫丁香基(S型)结构单元为主;毛竹EMAL在384℃出现一个明显的失重峰,而稻草EMAL热解时分别在270和384℃出现明显失重峰;两种木素化学结构的差异会影响EMAL的热解性质和热解产物.

关键词: 草本类植物, 木素, 热解, 热化学, 热重一傅里叶红外光谱联用, 热解一气相色谱/质谱联用

Abstract:

Two representative herbaceous plants, namely, rice straw and bamboo, were selected as the materials to produce two kinds of enzymatic/mild acidolysis lignin (EMAL) by isolating lignin via an enzymatic/mild acidolysis process. Then, the chemical structure and properties of the products were characterized by means of elemental analysis, FT-IR and quantitative 31p-NMR, and the pyrolysis characteristics of the products were investigated by means of TG-FTIR and Py-GC/MS. The results show that ( 1 ) rice straw contains more pentosan and extractives while bamboo contains more cellulose and lignin; (2) guaiacyl units (G type) are abundant in rice straw EMAL while bamboo EMAL possesses more syringyl units (S type) ; (3) during the thermal degradation, there is one distinct weight loss peak at 384℃ in bamboo EMAL but two at 270℃ and 384℃ in rice straw EMAL;and (4) the difference in chemical structure greatly affects thermal decomposition behaviors as well as pyrolysis products of EMAL.

Key words: herbaceous plant, lignin, pyrolysis, thermochemistry, TG-FTIR, Py-GC/MS