Separation and characterization of lignin from bio-ethanol production residue
Separation and characterization of lignin from bio-ethanol production residue
复制标题
从生物乙醇生产残渣中分离和表征木质素。
DOI：
10.1016/j.biortech.2012.10.041
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发表时间：
2013-05-01
影响因子：
11.4
通讯作者：
Fang, Guizhen
中科院分区：
文献类型：
--
作者：
Guo, Guowan;Li, Shujun;Fang, Guizhen
为了开发一种从生物乙醇生产残渣中分离木质素的合适方法，采用苯甲醇、二氧六环和乙醇进行了溶剂萃取。与传统的碱溶法和酸析法相比，苯甲醇和二氧六环萃取法的木素得率分别高达71.55%和74.14%。FTIR和X射线衍射分析结果表明，氢氧化钠溶液溶解了原料中的大部分木质素。然而，该方法木素产率较低的原因可能是复杂分离过程中产物的损失。凝胶渗透色谱和核磁共振氢谱分析表明，二氧六环木质素与碱木素的相对分子质量更接近碱木质素，而苯甲醇木质素的S/G值较低(0.22)，0Hph/OHAI值较高(0.45)。结果表明，从生物乙醇生产残渣中提取的木质素产品具有较好的化学活性，具有较好的应用前景。(C)2012爱思唯尔有限公司。保留所有权利。
In order to develop an adequate method to separate lignin from bio-ethanol production residue, solvent extraction was conducted by using benzyl alcohol, dioxane and ethanol. Compared to the conventional alkali-solution and acid-isolation method, benzyl alcohol and dioxane extraction could reach higher lignin yield of 71.55% and 74.14% respectively. FTIR and XRD analysis results indicate that sodium hydroxide solution dissolved most of the lignin in the raw material. However, the low lignin yield by this method may be attributed to the products loss during the complex separation process. GPC and 1H NMR results revealed that the dioxane-lignin had closer molecular weight with alkali-lignin, lower S/G ratio (0.22) and higher 0Hph/OHAI ratio (0.45) with respect to benzyl alcohol-lignin. The results divulge that the lignin products separated from bio-ethanol production residue by dioxane extraction had fairly potential application with better chemical activity. (C) 2012 Elsevier Ltd. All rights reserved.