木质素在离子液体中的降解研究

Study on Degradation of Lignin in Ionic Liquid

木质素是生物喷各组分中蕴藏能量最高的成分，也是其中唯一含有苯环结构的组分，因此高效无污染地降解木质素，是提高其资源利用率的一种重要途径。本文研究了木质素在1-甲基-3-苄基咪唑氯盐（BnMIMCI）和1-甲基-3-苄基咪唑三氟乙酸盐（BnMIMTFA）两种离子液体中的降解，并研究了温度，反应时间对降解效果的影响，最高液化率可达77．27％。通过对液化产物乙酸乙酯萃取物进行GC-MS分析，发现主要为小分子酚物质。本研究为木质素降解液化以达到高效利吲的目的提供了良好途径。

Lignin is proved to be the highest energy component, as well as natural aromatic polymer consisting of phenol units. Degraded lignin efficiently and environmentally friendly provides an important way to improve its utilization efficiency. Two kinds ionic liquids were adopted （BnMIMC. I and BnM1MTFA） as the mediums for the lignin degradation, and the effects of temperature and time on the reaction were investigated. The highest liquefaction efficiency of 77.27% was obtained under the optimized conditions It was found out through GC-MS analysis that the main components of the low molecular products were phenols in the extracted liquor from the fegraded liquid by ethyl acetate. The study provides a favorable approach to efficient utilization of lignin through degradation of liquefied