Disassembly of lignin and chemical recovery in supercritical water and p-cresol mixture. Studies on lignin model compounds.
Disassembly of lignin and chemical recovery in supercritical water and p-cresol mixture. Studies on lignin model compounds.
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DOI：
10.1016/j.biortech.2007.03.062
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发表时间：
2008-04
影响因子：
11.4
通讯作者：
Kazuhide S. Okuda;S. Ohara;M. Umetsu;S. Takami;T. Adschiri
中科院分区：
文献类型：
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作者：
Kazuhide S. Okuda;S. Ohara;M. Umetsu;S. Takami;T. Adschiri
该研究的目的是深入了解每个单元的木质素在产品形成中的作用。使用甘油、愈创木酚、甘油和愈创木酚的混合物（Gly&Gua）以及愈创木基甘油-β-愈创木基醚（GGGE）作为木质素模型化合物以研究在400°C下在过量的水和对甲酚中木质素的断裂。采用气相色谱（GC）-质谱（MS）和气相色谱-离子化检测器对产物进行定性和定量分析。GC-MS分析表明，生成了苯酚、邻甲酚、甲基苯甲醚、二甲基苯酚、乙基甲基苯酚、2-（羟基苄基）-4-甲基苯酚（BMP）和2-（2-羟基-5-甲基苄基）-4-甲基苯酚。产物与木质素裂解产物相似。除邻甲酚外，产物主要来源于甘油和/或愈创木酚。我们还发现GGGE衍生的BMP的量远高于Gly&Gua衍生的BMP，GGGE在其结构中具有甘油单元和愈创木酚单元。与甘油和/或愈创木酚相比，GGGE反应的BMP产量增加，表明具有Gly&Gua连接的愈创木酰甘油单元在BMP的形成中起重要作用，并且还表明GGGE形成BMP的途径不同于Gly&Gua。
The aim of the study was to gain insight into the role of the each unit of lignin in the formation of products. Glycerol, guaiacol, the mixture of glycerol and guaiacol (Gly&Gua), and guaiacylglycerol-β-guaiacyl ether (GGGE) were used as lignin model compounds to study fragmentation of lignin in an excess of water and p-cresol at 400°C. The products have been analyzed employing gas chromatography (GC)–mass spectrometer (MS) and gas chromatography-frame ionization detector for qualitative and quantitative analysis. GC–MS analysis indicated that phenol, o-cresol, methyl-anisole, di-methyl-phenol, ethyl-methyl-phenol, 2-(hydroxy-benzyl)-4-methyl-phenol (BMP) and 2-(2-hydroxy-5-methyl-benzyl)-4-methyl-phenol were formed. The products were similar to the products by the fragmentation of lignin. The products, except o-cresol, were primarily derived from glycerol and/or guaiacol. We also found that the amount of BMP derived from GGGE, which has glycerol unit and guaiacol unit in its structure, is much more than that derived from Gly&Gua. The increase of the BMP yield by reaction with GGGE compared with (glycerol and/or guaiacol) indicates that guaiacylglycerol unit with linkage of Gly&Gua plays an important role in the formation of BMP and also it is suggested that the BMP formation from GGGE has pathways other than that from Gly&Gua.