针对木质素复杂的化学结构、反应活性低及难溶于普通溶剂的缺点，以NaOH/H₂O₂为溶剂体系对蔗渣木质素（BL）进行催化解聚，完成了适合于该催化体系的催化剂开发，并考察了反应温度及BL初始质量分数等条件对木质素液化率及液化产物组成的影响。利用FT-IR及GC-MS对液化产物或残余物进行表征。结果表明，优化后的解聚条件为：ZnCl₂/FeCl₃为催化剂、反应温度为260℃、反应时间为60 min、催化剂与BL的质量比为0.15、木质素的质量分数为2%，该条件下BL的液化率为（79.02±2.24）%。BL催化解聚方式主要是C—O键的断裂，液化产物由单取代和双取代酚类化合物组成，主要包括4-乙基苯酚、2-甲氧基-4-乙基苯酚和4-烯丙基-2，6-二甲氧基苯酚等。

Aiming at overcoming the shortcomings of bagasse lignin (BL),such as complex chemical structure,low reactivity and insoluble in common solvent,BL is catalytically depolymerized in NaOH/H₂O₂ solvent system.The catalyst for this catalytic system is developed and the effects of process parameters including catalysts type,reaction temperature and catalyst/BL ratio on the liquefying ratio of BL and the composition of liquefied products are investigated.BL liquefied products or residues are characterized by Fourier transform infrared spectroscopy (FT-IR) and gas chromatography-mass spectrometry (GC-MS).The operating conditions are optimized as follows:260℃,60 min,a catalyst/BL ratio of 0.15,2% of BL over ZnCl₂/FeCl₃ catalyst.Under the optimal conditions,the liquefaction yields of BL can reach 79.02±2.24%.Research results demonstrate that the main mode of BL catalytic depolymerization is the fracture aryl-ether (C—O) bond,the main chemical compounds of the liquefaction products include mono-substituted and bis-substituted phenols,such as 4-ethylphenol,2-methoxy-4-ethylphenol,2,6-dimethoxy-4-allylphenol,and so on.

刘培杰(1972-),男,硕士,高级工程师,研究方向为生物质综合利用,295083173@qq.com