玉米秸秆木质素的提取工艺优化及表征  

Extraction and Characterization of Lignin from Corn Stover

作　　者：张坤[1] 王高煊 王晓俊[1] 张莎莎[1] 薛冬桦[1] 

机构地区：[1]长春工业大学化学与生命科学学院,吉林长春130012

出　　处：《食品科学》2015年第6期58-62,共5页Food Science

基　　金：吉林省科技发展计划项目(20126035);长春市科技支撑计划项目(2012213)

摘　　要：应用碱溶-醇沉-酸析方法提取玉米秸秆木质素,Box-Behnken试验优化工艺条件为Na OH溶液浓度2.40 mol/L、反应时间3.10 h、提取温度74℃,木质素的提取率达到69.71%。经热重、傅里叶变换红外光谱和紫外-可见吸收光谱结构分析表明,木质素在130~500℃内发生热分解反应,部分官能团发生交联后具有很高的热稳定性,最大紫外吸收峰位于282 nm波长处,存在较多的化学活性基团。所得木质素因其化学活性高,可通过分子设计改性形成高分子材料,从而为玉米秸秆的资源化利用提供新途径。Lignin is a natural phenolic polymer abundant in corn stover. It plays an important role in the synthesis of adsorbents, dye dispersants, concrete water-reducing agents and many others in the field of chemical industry. In this work, we developed a method to extract lignin from corn stover by means of alkaline solubilization, alcohol precipitation and acid separation. Box-Behnken design was applied to optimize the extraction process. The highest lignin yield achieved was 69.71% under the condition of 2.40 mol/L Na OH at 74 ℃ for 3.10 hours. The resulting lignin was analyzed by using thermogravimetry(TG), Fourier transform infrared spectroscopy(FT-IR) and ultraviolet-visible(UV-Vis) spectroscopy. This lignin was decomposed mainly between 130 and 500 ℃. Some of its functional groups formed a cross-linked complex with thermal stable structures. The maximum UV absorption occurred at 282 nm. This lignin is very reactive and suitable for polymer synthesis and modification. Thus, this study provides a new way of utilizing corn stover.

关 键 词：木质素 玉米秸秆 碱溶-醇沉-酸析 表征 

分 类 号：TQ314.1[化学工程—高聚物工业]