Fractional pretreatment of lignocellulose by alkaline hydrogen peroxide: Characterization of its major components
Fractional pretreatment of lignocellulose by alkaline hydrogen peroxide: Characterization of its major components
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碱性过氧化氢对木质纤维素的分级预处理：其主要成分的表征
DOI：
10.1016/j.fbp.2014.04.001
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发表时间：
2015-04-01
影响因子：
4.6
通讯作者：
He, Zhimin
中科院分区：
文献类型：
--
作者：
Su, Yapeng;Du, Ruoyu;He, Zhimin
木质纤维素转化的生物精炼过程通常需要对其三种主要成分进行分馏，包括纤维素、半纤维素和木质素。目前的工作表明，用于分级木质纤维素（例如玉米芯）的碱性过氧化氢（AHP）方法由于其温和的反应条件、低碱用量以及三种组分的有效分级而具有优势。处理6 h后木质素和半纤维素的去除率分别达到75.4%和38.7%，AHP残留物中纤维素的回收率为81.3%。对 AHP 残渣进行 24 小时酶解后，我们发现纤维素转化率约为 80%。通过乙醇沉淀和脱盐，89%的溶解半纤维素以白色固体形式回收，而77.5%的可溶木质素以棕色固体形式获得。进一步表征了分离的三种组分。 AHP残留物的主要热解温度增加。回收的木质素显示，通过 H2O2 的氧化，羧酸含量增加，酚羟基含量减少。 (C) 2014 年化学工程师学会。由 Elsevier B.V. 出版。保留所有权利。
The biorefinery process for lignocellulose conversion generally requires fractionation of its three major components including cellulose, hemicellulose, and lignin. The present work demonstrates that the alkaline hydrogen peroxide (AHP) method for fractionating lignocelluloses, such as corncob, is advantageous due to its modest reaction conditions, low alkaline usage, and effective fractionation of three components. The removal ratio of lignin and hemicellulose after 6 h treatment reached 75.4% and 38.7%, respectively, leaving the recovery ratio of cellulose in the AHP residues at 81.3%. After 24h enzymatic hydrolysis of the AHP residues, we found that the degree of cellulose conversion was approximately 80%. Through ethanol precipitation and desalination, 89% of dissolved hemicellulose was recovered as white solids, whereas 77.5% of soluble lignin was obtained as brown solids. The isolated three components were further characterized. The major pyrolysis teinperature of the AHP residues increased. And the recovered lignin revealed an increase in carboxylic acid content and a decrease in phenolic hydroxyl content by oxidation of H2O2. (C) 2014 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.