Structural analysis of lignin residue from black liquor and its thermal performance in thermogravimetric-Fourier transform infrared spectroscopy
Structural analysis of lignin residue from black liquor and its thermal performance in thermogravimetric-Fourier transform infrared spectroscopy
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黑液木质素残渣的结构分析及其热重-傅里叶变换红外光谱热性能
DOI：
10.1016/j.biortech.2012.10.148
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发表时间：
2013-01-01
影响因子：
11.4
通讯作者：
Zhang, Huiyan
中科院分区：
文献类型：
--
作者：
Hu, Jun;Xiao, Rui;Zhang, Huiyan
采用元素分析、碳13核磁共振（C 13 NMR）、氢核磁共振（H 1 NMR）和傅里叶变换红外光谱（TG-FTIR）等方法对造纸黑液中苯-乙醇抽提木质素（BEL）和丙酮抽提木质素（AL）的结构进行了表征，并对其热行为进行了研究。BEL和AL的β-O-4键/100个C9单体单元的频率分别为28和17。BEL的初始析溶剂阶段（110-180 ℃）的质量损失速率大于AL。两种木质素在主热解阶段（280-500 ℃）的质量损失曲线和气体析出曲线略有不同。提出了木质素热裂解反应的动力学模型，得到了BEL和AL的活化能分别为39.5和38.8kJ/mol。(C)2012爱思唯尔有限公司保留所有权利。
Structural characteristics of benzene-ethanol-extracted lignin (BEL) and acetone-extracted lignin (AL) precipitated from black liquor were identified by elemental analysis, FOR, C-13 NMR, and H-1 NMR, while the thermal behaviors were examined with thermogravimetric-Fourier transform infrared spectroscopy (TG-FTIR). The frequency of beta-O-4 bonds per 100 C9 monomeric units was 28 and 17 for BEL and AL Two-stage pyrolysis processes were observed for the two lignins. The mass loss rate of the initial solvent evolution stage (110-180 degrees C) of BEL was greater than that of AL The two lignins presented slightly different mass loss curves and evolution profiles of gases in the main pyrolysis stage (280-500 degrees C). A global kinetic model was proposed for lignin pyrolysis and activation energies of 39.5 and 38.8 kJ/mol was obtained for BEL and AL The results enhance understanding of lignin pyrolysis and facilitate commercial utilization of black-liquor lignin. (C) 2012 Elsevier Ltd. All rights reserved.