Lignin depolymerisation in supercritical carbon dioxide/acetone/water fluid for the production of aromatic chemicals
Lignin depolymerisation in supercritical carbon dioxide/acetone/water fluid for the production of aromatic chemicals
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DOI：
10.1016/j.biortech.2011.11.121
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发表时间：
2012-02-01
影响因子：
11.4
通讯作者：
Sanders, Johan P. M.
中科院分区：
文献类型：
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作者：
Gosselink, Richard J. A.;Teunissen, Wouter;Sanders, Johan P. M.
木质素的价值在木质纤维素生物炼制工艺的进一步发展、生物燃料和生物基材料的生产中起着关键作用。在本研究中，将有机溶剂硬木和麦草木质素在由二氧化碳/丙酮/水（300-370摄氏度，100巴）组成的超临界流体中转化为由低聚片段和单体芳族化合物组成的酚油，总收率为基于木质素的10-12%。这些产率类似于最先进的技术，例如用于木质素解聚的碱催化热工艺。甲酸的加入通过稳定芳族自由基而增加单体芳族物质的产率。麦草和阔叶木木质素的超临界解聚产生不同组成的单体化合物，最大产率分别为2.0%和3.6%的胡萝卜酸和胡萝卜醇。本研究的结果表明，在所施加的条件下，竞争之间发生的木质素解聚和碎片的再缩合。(C)2011爱思唯尔有限公司保留所有权利。
Valorisation of lignin plays a key role in further development of lignocellulosic biorefinery processes the production of biofuels and bio-based materials. In the present study, organosolv hardwood and wheat straw lignins were converted in a supercritical fluid consisting of carbon dioxide/acetone/water (300-370 degrees C, 100 bar) to a phenolic oil consisting of oligomeric fragments and monomeric aromatic compounds with a total yield of 10-12% based on lignin. These yields are similar to the state-of-the-art technologies such as base-catalysed thermal processes applied for lignin depolymerisation. Addition of formic acid increases the yield of monomeric aromatic species by stabilizing aromatic radicals. Supercritical depolymerisation of wheat straw and hardwood lignin yielded monomeric compounds in different compositions with a maximum yield of 2.0% for syringic acid and 3.6% for syringol, respectively. The results of the present study showed that under the applied conditions competition occurred between lignin depolymerisation and recondensation of fragments. (C) 2011 Elsevier Ltd. All rights reserved.