Ti-Si复合糖醇盐:对PET的脱聚和再聚合研究
Yang Yu1, Guoliang Shen1, Tie Jun Xu1
1Shenyang University of Technology Liaoyang City Liaoning Province China shengl_shxy@sut.edu.cn.
RSC advances
|December 14, 2023
概括
一种新型的--乙烯基醇盐 (Ti/Si-EG) 催化剂有效地将废弃的聚乙烯二甲 (PET) 分解为二甲-乙烯二甲 (BHET),从而实现高价值回收. 这种催化剂还促进了新PET的合成,其性能与传统方法相提并论.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 聚合物化学 聚合物化学
背景情况:
- 聚乙烯二甲酸盐 (PET) 的回收仍然是一个重大的环境挑战.
- 现有的PET回收方法往往导致材料降解或价值较低的产品.
- 开发用于PET脱聚合和随后的再聚合的高效催化剂对于可持续的循环经济模型至关重要.
研究的目的:
- 为了合成和表征一种新的Ti-Si-乙烯基醇盐 (Ti/Si-EG) 催化剂.
- 研究Ti/Si-EG的催化活性,以使PET脱聚变为双乙烯基甲酸盐 (BHET).
- 用Ti/Si-EG催化剂为高价值PET回收利用,优化PET脱聚合和随后的多重凝结的条件.
主要方法:
- 合成Ti-Si-乙烯基醇盐 (Ti/Si-EG) 催化剂.
- 响应表面分析以确定最佳脱聚合条件 (催化剂剂量,温度,时间,反应剂比率).
- 使用乙烯基醇 (EG) 和Ti/Si-EG催化剂去聚合PET.
- 使用Ti/Si-EG催化剂合成回收PET的BHET聚凝.
- 合成PET的性能测试和与传统生产的PET进行比较.
主要成果:
- 最佳脱聚合条件:EG:PET比为 4:1,0.56%,催化剂剂量为203,温度为3.8小时,产生90.10%的BHET.
- 从BHET使用Ti/Si-EG催化剂与0.015%的催化剂添加成功合成PET.
- 合成PET的性能与通过传统PTA方法生产的PET相美.
- 加入Si降低了Ti的催化活性,并防止了产品的黄色化.
- 糖醇盐催化剂避免了将杂质组引入回收PET.
结论:
- /Si-EG催化剂通过脱聚合和再聚合实现了废PET的高效,高价值回收.
- 优化的工艺实现了BHET的高产量,并产生具有理想性质的回收PET.
- 催化剂的成分 (Si添加) 通过防止黄色变化来提高产品质量.
- 该方法为废弃PET管理提供了可持续的解决方案,为循环经济做出了贡献.
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