摘要
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.
作者
刘培杰
谢仁珍
冼学权
黎演明
LIU Pei-jie;XIE Ren-zhen;XIAN Xue-quan;LI Yan-ming(Guangxi Zhuang Autonomous Region Institute of Product Quality Inspection,Nanning 530007,China;Guangxi Light Industry Science and Technology Research Institute Co.,Ltd.,Nanning 530007,China;State Key Laboratory for Enzymatic Hydrolysis of Non-food Biomass,National Engineering Research Center for Non-food Biomass Energy,Guangxi Academy of Sciences,Nanning 530007,China)
出处
《现代化工》
CAS
CSCD
北大核心
2020年第7期113-116,121,共5页
Modern Chemical Industry
基金
国家自然科学基金地区项目(31660251)
广西科技计划主席基金项目(16449-02)
广西科学院基本业务项目(2017YJJ230009)。
关键词
甘蔗渣
木质素
解聚
碱水体系
液化产物
bagasse
lignin
depolymerization
alkaline water system
liquefied products
