功能化离子液体催化降解PET的基础研究
文献类型：学位论文
| 作者 | 周雪源 |
| 学位类别 | 硕士 |
| 答辩日期 | 2012-05-25 |
| 授予单位 | 中国科学院研究生院 |
| 导师 | 张锁江 ; 吕兴梅 |
| 关键词 | PET 离子液体 催化 降解 |
| 其他题名 | Degradation of PET catalyzed by functional ionic liquids |
| 学位专业 | 化学工艺 |
| 中文摘要 | 聚对苯二甲酸乙二醇酯（PET）聚酯，作为最重要的聚酯塑料之一，用途广泛，年消耗量逐年攀升。其回收利用肩负着环境保护和塑料产业可持续发展的双重重任，是变废为宝及解决生态环境污染的重要途径。通过对废旧PET产品的回收再利用，可延长资源的利用周期，节约生产原料，降低环境污染，产生巨大的社会和经济效益。离子液体是一种新型绿色溶剂，已经成为国际科技前沿和热点，其在废塑料回收利用方面存在巨大的潜力，可高效解聚废PET为单体或化工原料，实现PET废料循环再利用，为其他聚酯废料和泡沫塑料的高效降解提供了可资借鉴的新方法与新技术。论文的主要研究内容和创新成果如下： 1）设计并合成了金属醋酸型和强碱型两个系列的新型离子液体，通过多种手段对其进行分析表征，验证所合成离子液体的结构与纯度。 2）对非卤素类的金属醋酸型离子液体催化降解PET的性能进行了考察，优选出高效离子液体催化剂，并优化了反应时间，温度，催化剂用量等工艺条件；通过NMR，IR，XRD，TGA，DSC等多种表征和分析途径，确定了主要降解产物为BHET单体；提出了金属醋酸根离子液体阴阳离子协同催化降解PET的反应机理。 3）分析和讨论了多种强碱性离子液体对PET的催化降解效果，并与金属醋酸根离子液体的催化效果进行对比，发现碱性在该类型离子液体催化降解PET的过程中具有显著的作用。研究了时间，温度，催化剂用量等反应条件对降解效果的影响；同时发现，该系列离子液体催化剂对不同类型PET都具有良好的催化降解效果。 |
| 英文摘要 | As one of the most important polyester plastic material, the application of poly(ethylene terephthalate) (PET) is extensive, the annual consumption of which is rising year by year. The recycling of PET is beneficial for both the environmental protection and sustainable development of plastic industry; besides, it’s significant for changing waste into valuable and resolving environmental pollution. It will prolong the cycle of resources utilization, save material, reduce the damages to environment, and make tremendous social and economic benefits by recycling of PET wastes. Ionic liquid, which is a kind of new green solvent, has become the leading trend and hot spot of international science. It has great potential in waste plastics recycling, as an effective catalyst in depolymerization of PET to monomer or other chemical materials, which can be reused to manufacture polymer as secondary value-added products, providing an example for the depolymerization of other plastics. The main contents and Innovative achievements of this research are as follows, 1) Different kinds of ionic liquids are designed and synthesized, including metallic acetate ILs and superbase ILs. The structure and purity of ILs are determined by sorts of techniques. 2) Several kinds of chlorine-free metallic acetate ILs, which have the excellent properties of low toxicity, corrosivity, and cost, facilitated the glycolysis of PET, and [deim][Zn(OAc)3] behaved as the best catalyst. The main product was characterized by different methods. It turned out that the main product is BHET monomer. Detailed study of the properties of BHET product also illustrated its purity. The effects of reaction parameters, such as the glycolysis time, amount of catalyst, reaction temperature, and addition of PET on conversion of PET, selectivity of BHET, and distribution of the products have been researched. In this glycolysis process, temperature is a critical factor. In the end, the possible mechanism was proposed, indicating the synergistic effect of cation and anion. 3) Superbase ILs were used to catalyze the glycolysis of PET and the results were compared with that of glycolysis by metallic acetate ILs. It was found that the basicity plays an important role in the degradation of PET. The main variables of the glycolysis process (time, addition of catalyst, temperature, etc.) have been optimized. Moreover, different kinds of PET can be depolymerized by superbase ILs. |
| 语种 | 中文 |
| 公开日期 | 2013-09-25 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1821]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 周雪源. 功能化离子液体催化降解PET的基础研究[D]. 中国科学院研究生院. 2012. |
入库方式： OAI收割
来源：过程工程研究所
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