Separation and characterization of lignin from bio-ethanol production residue
详细信息 查看全文
- 作者：Guowan Guo ; Shujun Li ; lishujun_1999@yahoo.com ; Lu Wang ; Shixue Ren ; Guizhen Fang
- 关键词：Bio-ethanol production residue ; Lignin ; Extraction ; Benzyl alcohol ; Dioxane
- 刊名：Bioresource Technology
- 出版年：2013
- 出版时间：May, 2013
- 年：2013
- 卷：135
- 期：Complete
- 页码：738-741
- 全文大小：171 K
文摘
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 OHPh/OHAl 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.