基于制备色谱法分离纯化碱木质素
基于制备色谱法分离纯化碱木质素(任务书,开题报告,论文13000字)
摘要
木质素是一种芳香类生物聚合物材料。从全球第二大最为丰富的可再生资源木质纤维素中分离出来，但木质素结构复杂、种类繁多，需要不断优化分析方法，对木质素结构进一步的深入理解，才能更好的分离提纯木质素，降低劳动成本，放大工业化生产。如今，工业木质素分离主要以化学碱法制浆得到碱木质素，被称为“黑液”，但绝大部分木质素没有进行分离和回收，而是直接将其当作制浆厂的低值燃料，这造成了大量的能源和产品浪费，所以碱的回收也对降低成本起着至关重要的作用。碱回收工艺是木质素生产过程中的关键步骤，这就促使我们要寻求一种低能耗、低成本、易操作的绿色环保手段。因此，本课题主要就是研究影响黑液中碱木质素与氢氧化钠分离的原因。
本课题主要目的就是用紫外分光光度计对碱木质素溶液进行全波段扫描，得到测碱木质素浓度的最佳波长278nm，用于测量复配液中碱木质素的浓度，再筛选出一种合适的树脂（纳米孔中性树脂NH-1），用于吸附分离碱木质素和氢氧化钠两组分，通过使用pH计和紫外分光光度计测量收集黑液中的氢氧化钠和碱木质素，利用色谱曲线图分析碱木质素和氢氧化钠的吸附分离过程，最后再对实验结果进行对比与分析，了解碱木质素与氢氧化钠的分离机理，为提高黑液中碱木质素的纯度和氢氧化钠的回收率提供理论基础，使纳米孔中性树脂吸附分离技术能更好的运用到工业化生产中。
关键词：木质素 NH-1树脂 吸附分离技术
Abstract
Lignin is an aromatic biopolymer material. It is separated from the world's second most abundant renewable resource, lignocellulose. However, the structure of lignin is complex and there are many kinds of lignin. It is necessary to continuously optimize the analytical methods.
A deeper understanding of the structure of lignin can be used to separate and purify lignin. , Reduce labor costs and enlarge industrial production. Today, industrial lignin separation is mainly made by chemical alkaline pulping to obtain alkali lignin, known as “black liquor”, but most of the lignin is not separated and recycled, but is directly used as a low value for the pulp mill. Fuel, which has caused a lot of energy and product waste, so the recovery of alkali also plays a crucial role in reducing costs and the production process. Alkaline recycling process is a key step in the production of lignin, which prompted us to seek a low-energy, low-cost，easy-to-operate green environmental protection means. Therefore, the main issue of this project is to study the cause of the separation of alkali lignin from sodium hydroxide in black liquor.
[资料来源：www.doc163.com]
The main purpose of this project is to use an ultraviolet spectrophotometer to perform a full-wavelength scan of the alkali lignin solution to obtain the best measured wavelength of 278nm, which is used to measure the concentration of alkali lignin in the compounding solution, and then select a suitable one. Resin (Nano-pore-neutral resin, NH-1) is used for adsorption and separation of alkali lignin and sodium hydroxide. The sodium hydroxide and alkali lignin in the black liquor are measured by a PH meter and an ultraviolet spectrophotometer, respectively. The chromatogram curve was used to investigate the adsorption and separation process of alkali lignin and sodium hydroxide. Finally, through comprehensive discussion and comparison of experimental results, the separation mechanism of alkali lignin and sodium hydroxide was understood to increase alkali lignin in black liquor. The purity and the recovery of sodium hydroxide provide the theoretical basis for the application of nanoporous resin adsorption and separation technology to industrial production. [版权所有：http://DOC163.com]
Keywords: lignin NH-1 resin adsorption separation technology
目录
摘要 I
Abstract II
目录 III
第一章 文 献 综 述 1
1.1 自然资源和能源问题 1
1.2木质纤维素的归纳 1
1.3木质纤维素的应用 2
1.4 木质素的结构及特性 2
1.4.1 化学结构 2
1.4.2 化学性质 3
1.5 木质素的应用前景 4
1.6 木质素的分离提纯 4
1.7 碱木质素的分离过程 5 [资料来源：www.doc163.com]
1.8研究目的和意义 5
1.9本课题的研究意义 5
1.10 预期目标 7
第二章 树脂筛选和二组分分离研究 8
2.1 引言 8
2.2 实验材料与仪器 8
2.2.1 实验材料 8
2.2.2 实验仪器 8
2.3理论基础 9
2.3.1尺寸排阻色谱分离技术 9
2.3.2 液相色谱分析法 9
2.3.3 色谱图 10
2.4实验方法与步骤 12
2.4.1 二组分混合液配制 12
2.4.2 紫外光谱全波段波长扫描 12
2.4.3树脂的筛选 13
2.4.4 上柱进样的步骤 13
2.4.5紫外分光光度计测量碱木质素浓度 14
2.4.6 pH计测量氢氧化钠浓度 14
第三章 实验结果与讨论 15
3.1概括 15
3.2 不同复配液进样量对分离的影响 16 [来源：http://www.doc163.com]
3.2.1 实验一 16
3.2.2实验二 18
3.2.3 实验三 20
3.3 不同复配液浓度对分离的影响 22
3.3.1 实验四 22
3.3.2实验五 24
第四章 结论与展望 27
4.1 结论 27
4.2 展望 27
参考文献 29
致谢 29 [资料来源：http://www.doc163.com]