木质素结构及热解特性

doi:10.3969/j.issn.0438-1157.2014.09.043

化工学报 ›› 2014, Vol. 65 ›› Issue (9): 3626-3633.DOI: 10.3969/j.issn.0438-1157.2014.09.043

木质素结构及热解特性

陈磊¹, 陈汉平¹, 陆强², 宋扬³, 丁学杰³, 王贤华¹, 杨海平¹

1 华中科技大学煤燃烧国家重点实验室, 湖北武汉 430074;
2 华北电力大学生物质发电成套设备国家工程实验室, 北京 102206;
3 贵州华电毕节热电有限公司, 贵州毕节 551713

收稿日期:2014-01-06 修回日期:2014-05-16 出版日期:2014-09-05 发布日期:2014-09-05
通讯作者: 陈汉平
基金资助:
国家重点基础研究发展计划项目（2013CB228102）；国家自然科学基金项目（51376076）；公益行业（农业）科研专项（201303095）。

Characterization of structure and pyrolysis behavior of lignin

CHEN Lei¹, CHEN Hanping¹, LU Qiang², SONG Yang³, DING Xuejie³, WANG Xianhua¹, YANG Haiping¹

1 State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, Wuhan 430074, Hubei, China;
2 National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China;
3 Huadian Bijie Thermal Power Co., Ltd., Bijie 551713, Guizhou, China

Received:2014-01-06 Revised:2014-05-16 Online:2014-09-05 Published:2014-09-05
Supported by:
supported by the National Basic Research Program of China (2013CB228102), the National Natural Science Foundation of China (51376076) and the Special Fund for Agro-scientific Research in the Public Interest(201303095).

摘要/Abstract

摘要： 为研究结构类型和提取方法对木质素热解特性的影响，本研究采用Klason方法预处理得到的棉杆、核桃壳Klason木质素和贝克曼方法预处理得到的核桃壳磨木木质素（MWL），并结合傅里叶红外光谱仪（FT-IR）和快速热解仪-气相色谱/质谱联用（Py-GC/MS）对其化学结构和热解特性进行分析。FT-IR表明碱木质素为G型木质素，棉杆木质素属于GS类型木质素，而核桃壳木质素具有 HGS木质素的特征；Py-GC/MS分析发现原料的变化以及提取方法对木质素热解产物的组成有明显的影响，在棉杆Klason木质素中邻苯二酚类产物含量为28.18%，而在核桃壳Klason和磨木木质素的含量分别为18.12%和35.11%。同时研究表明经两种方法处理的木质素结构有明显的不同，其中Klason木质素结构中苯丙酸侧链上的α-和β-醚键明显断裂，而贝克曼处理主要体现在苯基芳基醚键的断裂。

关键词: 木质素, 结构分析, 快速热解, 热裂解特性

Abstract: The influence of extraction method and structure type on the pyrolysis behavior of lignin was investigated. The functional groups and pyrolysis characteristics of Klason lignin extracted from cotton stalk and walnut shell by the Klason method (labeled as KCSL and KWSL, respectively), and milled wood lignin extracted from walnut shell via the Björkman method (labeled as BWSL), were analyzed with Fourier transform infrared spectroscopy (FTIR) and pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS). The results were compared with commercial alkali lignin (CAL). The FTIR results revealed that alkali lignin, cotton stalk lignin and walnut shell lignins were Type G, Type GS and Type HGS, respectively. The pyrolysis results from Py-GC/MS suggested that the products distribution of various lignins were affeted by material type and extraction method greatly. The contents of catechol derivatives obtained from KCSL, KWSL and BWSL were 28.18%, 18.12% and 35.11%. Meanswhile modification of BWSL was mainly attributed to the breakage of benzyl aryl ether linkages, whereas cleavage of ether bonds at the α-and β-positions on the propanoid side chain was the marked feature of Klason lignin.

Key words: lignin, structure analysis, fast pyrolysis, pyrolysis behavior

中图分类号:

陈磊, 陈汉平, 陆强, 宋扬, 丁学杰, 王贤华, 杨海平. 木质素结构及热解特性[J]. 化工学报, 2014, 65(9): 3626-3633.

CHEN Lei, CHEN Hanping, LU Qiang, SONG Yang, DING Xuejie, WANG Xianhua, YANG Haiping. Characterization of structure and pyrolysis behavior of lignin[J]. CIESC Journal, 2014, 65(9): 3626-3633.

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木质素结构及热解特性

Characterization of structure and pyrolysis behavior of lignin

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