甲酸―盐酸体系下木质纤维素的组分分离  

Lignocellulosic Component Separation Process in Formic Acid-Hydrochloric Acid Mixture Solvent

作　　者：张莉[1] 于淑静[1] 张龙[1] 

机构地区：[1]长春工业大学吉林省石化资源与生物质综合利用工程实验室,吉林长春130012

出　　处：《纤维素科学与技术》2013年第1期56-61,共6页Journal of Cellulose Science and Technology

摘　　要：研究了常压下甲酸―盐酸体系中木屑的溶解规律,结合酸回收和碱沉方法实现了木屑的组分分离。经酸体系处理后的剩余物主要成分为纤维素,滤液经酸回收和碱沉后得到的沉淀是木质素,半纤维素全部水解。实验确定了最佳分离条件:在甲酸―盐酸(体积比3∶1)体系中,溶解温度为60℃,溶解时间为180min,液固比为10∶1,在此条件下,木屑的溶解率可达48.8%,木质素收率为23.2%。通过FTIR、XRD及NMR等方法对溶解后及甲酸回收后剩余物质的结构进行了分析确证。The dissolution of sawdust in formic acid-hydrochloric acid system was reported and the separation of the lignocellulose ingredients combined with acid recycling and alkaline precipitation method was proposed. It is proven that the main residual after the treatment in acid system was mainly cellulose, the filtrate by the alkaline precipitation of the liquor was lignin, all hemicellulose were hydrolyzed into saccharides. The best dissolution conditions were determined by single-factor experiment as follows： under the condition that the system composed by formic acid-hydrochloric acid whose volume ratio 1 ： 3, dissolution temperature 60℃, dissolution time 3 h, the liquid-solid ratio 10 ： 1, the dissolution yield could achieve to 48.8% and the yield of lignin after acid treatment and alkaline precipitation can achieve to 23.2%. The structure of the components separated was identified by Fourier transform infrared spectroscopy （FTIR）, X-ray diffraction （XRD） and nuclear magnetic resonance （NMR） analysis.

关 键 词：木质纤维素 组分分离 复合酸体系 碱沉淀 

分 类 号：TQ35[化学工程]