乙醇预处理前后玉米秸秆半纤维素的提取及性质研究  

Study on the Structural Changes of Hemicellulose of Corn Stover during Ethanol Pretreatment

作　　者：夏青[1] 田彦[1] 姚兰[1,2] 张宏伟 谢益民[1] 杨海涛[1,2] 

机构地区：[1]湖北工业大学轻工学部制浆造纸工程学院,湖北武汉430068 [2]绿色轻工材料湖北省重点实验室,湖北武汉430068 [3]武汉联合工程顾问咨询有限公司,湖北武汉430071

出　　处：《中国造纸学报》2015年第2期12-17,共6页Transactions of China Pulp and Paper

基　　金：绿色轻工材料湖北省重点实验室2013年开放基金

摘　　要：以玉米秸秆为原料,在温度160℃、保温时间60 min、乙醇浓度50%、固液比1∶8的条件下进行预处理,并对预处理前后的玉米秸秆进行半纤维素的提取和纯化。结果表明,乙醇预处理过程脱除了玉米秸秆中66.6%的Klason木素和61.3%的苯-醇抽出物,还降解了部分半纤维素和少量纤维素。在乙醇预处理过程中,半纤维素中的葡聚糖最易降解,聚阿拉伯糖次之,聚木糖最稳定,糖醛酸含量没有明显变化。结合红外光谱、紫外光谱、液相色谱等分析发现,乙醇预处理后半纤维素中含有较多的甲基、亚甲基单元,说明乙醇预处理造成玉米秸秆半纤维素降解,使半纤维素分子质量降低、多分散系数变大。In this paper,corn stover was chosen as raw material and ethanol was used to pretreat it at the following condition： retention rime 60 minutes at 160℃ ,S/L 1：8 ,ethanol concentration 50%. Then hemicellulose was extracted and purified from corn stover before and after ethanol pretreatment respectively. The results of corn stover＇s component analysis showed that during pretreatment 66. 6% lignin and 61.3% extractives were removed, part of cellulose and hemicellulose were also degraded. According to the results,it was concluded that hemicellulose from corn stover was composed mainly with xylan, then arabinan, with trace amount of glucan and glactan. Besides, lignin and uronic acid were also present. The results of hemicellulose＇s component analysis showed that glucan from hemicellulose was the easiest to be degraded, then arabinan, xylan was the most stable in the process of ethanol pretreatment. And the content of uronic acid was not changed obviously during ethanol pretreatment. From the analysis of FT-IR, UV-V is spectrum and liquid chromatogram,it was found that hemicellulose from corn stover after ethanol pretreatment contained more -CH3 and -CH2-units,indicating that hemicellulose was degraded to some extent during the pretreatment process. In addition,a decrease in molecular weight and increase in polydispersity of hemicelluloses were the result of the degradation of hemicelluloses during ethanol pretreatment.

关 键 词：半纤维素 玉米秸秆 乙醇预处理 

分 类 号：TS711[轻工技术与工程—制浆造纸工程] TS721