Cheng Zhang, Hui He*, Yue Shen, Qunyang Li and Xun Ye,
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引用次数: 0
摘要
废弃聚对苯二甲酸乙二酯(PET)的回收利用对缓解环境污染和资源枯竭具有重要意义。目前在化学回收中使用的金属催化剂往往会导致金属残留和产品着色,从而限制了 PET 回收的工业化进程。在此背景下,合成了磷酸四丁基羧酸酯作为一种含有机磷的环境友好型离子液体催化剂,并研究了 PET 糖解的最佳反应条件,在 200 °C 和 120 分钟的条件下,PET 的转化率达到 100%,对苯二甲酸二(2-羟乙基)酯(BHET)的产率达到 40.8%。傅立叶变换红外光谱、1H NMR 和 XRD 显示,乙二醇产物主要由 BHET 和少量二聚体组成。1H NMR 图谱显示,离子液体催化 PET 糖酵解的反应模型是缩核模型,表观活化能为 89.73 kJ/mol。随后提出了一种可能的反应途径。制备出的绿色高效离子液体有望取代在产品中残留污染物的传统金属盐催化剂,用于废聚酯产品的回收。
Green Catalytic Ionic Liquids Containing Organophosphorus for Efficient Glycolysis of Waste PET Bottle Flakes
The recycling of waste poly(ethylene terephthalate) (PET) is of great significance to alleviate environmental pollution and resource depletion. The metal-based catalysts currently used in chemical recycling often lead to metal residues and product coloration, which limits the industrialization of PET recycling. In this context, tetrabutylcarboxylate phosphate as an environmentally friendly ionic liquid catalyst containing organophosphorus was synthesized, and optimal reaction conditions for the glycolysis of PET were investigated, enabling 100% PET conversion and 40.8% bis(2-hydroxyethyl) terephthalate (BHET) yields at 200 °C and 120 min. FT-IR, 1H NMR, and XRD showed that the glycolysis products were mainly composed of BHET and a spot of dimers. The 1H NMR spectrum showed that the reaction model of PET glycolysis catalyzed by an ionic liquid is a shrink-core model, and the apparent activation energy is 89.73 kJ/mol. A possible reaction pathway was proposed subsequently. The prepared green and efficient ionic liquid is expected to replace the traditional metal salt catalyst that leaves contaminants in the product for the recovery of waste polyester products.
期刊介绍:
ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.