Free-Radical Analysis on Thermochemical Transformation of Lignin to Phenolic Compounds
Free-Radical Analysis on Thermochemical Transformation of Lignin to Phenolic Compounds
复制标题
木质素热化学转化为酚类化合物的自由基分析
DOI：
10.1021/ef3016602
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发表时间：
2013-01-01
期刊：
影响因子：
5.3
通讯作者：
Zhang, Huiyan
中科院分区：
文献类型：
--
作者：
Hu, Jun;Shen, Dekui;Zhang, Huiyan
用凝胶渗透色谱(GPC)、傅里叶变换红外光谱(FTIR)和二维(2D)异核单量子相干核磁共振(HSQC)对工业黑液中木质素的平均相对分子质量、典型单元间键的分布和官能团进行了表征。β-O-4键的频率为17-28/100C9单位，而单位[愈创木酚(G)、丁香酚(S)和对羟基苯基(H)]的含量为G/S/H的7：2：1.5.凝胶渗透色谱(GPC)分析表明木质素的质量平均分子量为2238g/m ol.木质素中各单元的聚合度较低，导致低温下单元间的键裂解程度较大。用气相色谱-质谱仪(GC-MS)对木质素在500℃下快速热解产生的愈创木酚类、丁香酚类和苯酚类化合物进行了分析鉴定.
The chemical characteristics of lignin isolated from industrial black liquor were identified by gel permeation chromatography (GPC), Fourier transform infrared (FTIR) spectroscopy, and two-dimensional (2D) heteronuclear single-quantum coherence (HSQC) nuclear magnetic resonance (NMR), concerning its average molecular weight, distribution of typical interunit linkages, and functional groups. The frequency of β–O–4 linkage was determined to be 17–28/100 C9 units by 2D NMR, while the content of unit [guaiacol (G), syringol (S), and p-hydroxyphenyl (H)] presents a ratio of 7:2:1.5 for G/S/H. The mass-average molecular weight of lignin was characterized to be 2238 g/mol by GPC analysis. The low polymerization degree of the units in lignin leads to the substantial extent of interunit linkage cleavage at low temperatures. The guaiacol-, syringol-, and phenol-type compounds from fast pyrolysis of lignin in a pyroprobe at 500 °C were notably identified by gas chromatography–mass spectrometry (GC–MS) and presented ...