Comparative characterization of milled wood lignin from furfural residues and corncob
Comparative characterization of milled wood lignin from furfural residues and corncob
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糠醛残渣和玉米芯磨碎木质素的比较表征
DOI：
10.1016/j.cej.2011.09.091
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发表时间：
2011-11-15
影响因子：
15.1
通讯作者：
Jiang, Jianxin
中科院分区：
文献类型：
--
作者：
Bu, Lingxi;Tang, Yong;Jiang, Jianxin
糠醛残留物是用玉米芯生产糠醛过程中的副产品。废渣中的纤维素可以用来生产乙醇，但废渣中的另一主要成分木质素不可避免地对酶解过程产生不利影响。为了揭示木质素的作用和有效利用它，首先要研究它的性质，特别是在生产过程中的变化情况。本文对糠醛残渣(FR)和玉米芯的磨木木素进行了分离，并对其进行了UV比较研究。FT-IR、H-1和C-13核磁共振谱以及相对分子质量和热稳定性。研究发现，这三种结构单元在两种木质素级分中所占的比例不同，并且在生产过程中苯环上发生了一些反应。木素结构单元中的甲氧基被部分去除，与苯环共轭的基团被破坏。此外，玉米芯木质素中的醇羟基被还原并转化为羰基。在糠醛生产过程中，木质素的降解和缩合反应都发生了。(C)2011爱思唯尔B.V.保留所有权利。
Furfural residues are by-products from the process of furfural production with corncobs. The cellulose in the residues can be used to produce ethanol, but lignin, the other main component in the residues, inevitably exerts unfavourable effects on the enzymatic hydrolysis process. In order to reveal the effects and make an efficient utilization of the lignin, the characteristics, especially the variation during furfural production, should first be investigated. In this paper, the milled wood lignin (MWL) of the furfural residual (FR) and corncob were separated and a comparative study of the MWL fractions was made in terms of the UV. FT-IR, H-1 and C-13 NMR spectra as well as the molecular weight and the thermal stability. It was found that the proportion of the three structure units in the two kinds of lignin fractions was different and that some reactions had taken place on the benzene rings during furfural manufacture. The methoxyls in the lignin structure units had been removed partially, and the groups conjugated with the benzene rings were destroyed. Moreover, the alcoholichydroxyl in the lignin of the corncob reduced and transformed into carbonyl. Both the degradation of the lignin and the condensation reactions have emerged during the furfural production. (C) 2011 Elsevier B.V. All rights reserved.