不同介质下木质素降解转化为香兰素的研究
关键词：木质素；香兰素；离子液体
Study on degradation of lignin for synthesize vanillin in different medium
Abstract: In this paper ,the intermediate of ionic liquid : 1-Butyl-3-methylimidazolium Bromide was prepared which are generated from N－methylimidazole with butyl bromide. Then we used the intermediate synthesizes two ionic liquids through anions exchange with potassium acetate and potassium hydroxide. The two ionic liquids are [Bmim]OAC and [Bmim]OH. And their structures were characterized confirmed by 1HNMR.Then, degradation of lignin for synthesize vanillin were studied in two ionic liquids and the alkaline solution of sodium hydroxide was placed in the control experiment. The experimental results shows that the alkaline solution of sodium hydroxide as reaction medium was better. Finally , the better conditions of lignin for synthesize vanillin were studied in the alkaline solution of sodium hydroxide. The influence of process factors, such as amount of the catalyst and reacting temperature upon the yield of vanillin were investigated. The optimal reaction condition as following, medium is in the alkaline solution of sodium hydroxide （PH=11~12）, the catalyst amount is 10% according to the quantity of lignin,reacting temperature is 100 ℃，reaction time is 3h,the best yield of vanillin was about 8.1%.
Key words: lignin; vanilla; ionic liquids
目录
1前言 1
1.1 木质素的简介 1
1.2 香兰素简介 3
1.2.1 香兰素的生产 4
1.3离子液体简介 7
1.3.1 离子液体的定义及发展 8
1.3.2 离子液体的性质 9
1.3.3 离子液体的分类 9
1.3.4 离子液体的合成 10
1.3.5离子液体的应用 10
1.4研究的目的和意义 12
2 实验方法与内容 13
2.1 实验原料及试剂 13
2.2 实验装置 13
2.3 实验方法 14
2.3.1离子液体的制备 14
2.3.2木质素合成香兰素 15
3 实验结果及讨论 16
3.1 离子液体的制备 16
3.1.1 1-丁基-3-甲基咪唑醋酸盐的制备 16
3.1.2 氢氧化1-丁基-3-甲基咪唑的制备 17
3.2 木质素制备香兰素 18
3.2.1不同用量催化剂香兰素产率比较 19
3.2.2 改变反应温度 20
3.3 香兰素的结构分析 20
3.3.1 核磁共振分析 20
4 结论 21
致谢 22
参考文献 23
附录 25
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