木质素水解制备酚类化合物反应特性的研究
毕业论文关键词： 木质素 酚类化合物 水解反应 催化剂
Title Study on reaction characteristics of phenolic compounds prepared by hydrolysis of lignin
Abstract Lignin is the second largest natural polymer in the plant，only less than cellulose. It is mainly body composed by the phenylpropane unit. However，the current utilization of lignin still remains at a relatively low stage. Trying to convert it into high-value chemicals，especially phenolic compounds，is an important way to reduce pollution and create social and economic values. In this paper，the lignin was hydrolyzed in the ethanol/water solution under different conditions. The products were analyzed to find the effect of temperature，oxidation and catalysts to the hydrolysis. It is found that the introduction of H2O2 to the system could increase the hydrolysis of lignin. With the temperature increasing，the phenol yield increases，and the content of intermediate products decrease. Due to the decomposition of H2O2 at 80 ºC，it is a better way to add the H2O2 slowly to the system in order to further increase the phenol yield. The use of zeolites as the catalysis could effectively increase the hydrolysis rate of lignin and the phenol yield. TS-1 and HZSM-5 has the very good selectivity to guaiacol and lilacs phenol， respectively.
Keywords： Lignin Phenolic compounds Hydrolysis reaction Catalyze
目录
1绪论..1
1.1生物质能与其利用的意义1
1.2木质素的结构和分类3
1.3木质素的应用途径5
1.5木质素催化过程中的固体酸催化剂..10
1.6实验研究的目的、意义及研究方法..17
2实验仪器与实验操作19
2.1实验仪器与药品..19
2.2实验操作..21
3实验过程中温度对于木质素水解液化反应的影响23
4实验过程中氧化剂对于木质素水解液化反应的影响26
5实验过程中催化剂对于木质素水解液化反应的影响29
5.1MCM-41和SAPO-34对实验的影响...29
5.2HZSM-5对实验的影响..31
5.3TS-1对实验的影响31
5.4TS-1与HZSM-5掺杂对于实验的影响32
结论34
致谢35
参考文献..36
1 绪论 能源从古至今都是发展所离不开的必要因素，自从人们学会使用火，开始利用火以来，生物质的利用就和人类发展产生了密切的联系。人类社会中的每次的巨大变革都离不开能源利用方面的突破[1]。进入 21 世纪以来，随着世界人口不断增长，生产力的不断进步，人类对于能源的需求越来越大，而常规能源资源储备数量有限，且不可再生等一系列的因素使得我们不得不去积极寻找其替代品。在众多的可再生资源中，最具有广泛使用价值的是生物质能。生物质被誉为绿色煤炭，也是唯一既具有矿物燃料属性，又拥有耐储存、易运输、可再生、具有转换条件等特点，同时受到自然条件的限制较少的能源。因此生物质能及生物质产品的利用与转换具有极大的潜在市场，是我国寻求发展多元化清洁能源的重要组成，积极发展生物能源也是解决我国能源危机的最理想途径之一[2]。