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首页> 外文期刊>Journal of Applied Polymer Science >Calcined Zn/Al Hydrotalcites as Solid Base Catalysts for Glycolysis of Poly(ethylene terephthalate)
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Calcined Zn/Al Hydrotalcites as Solid Base Catalysts for Glycolysis of Poly(ethylene terephthalate)

机译：煅烧的Zn / Al水滑石粉作为固体基础催化剂，用于乙醇酸水解聚对苯二甲酸乙二酯

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摘要

In this research, glycolysis of poly(ethylene terephthalate) (PET) with ethylene glycol (EG) was carried out using Zn/Al mixed oxide catalyst. These mixed oxides were prepared by calcining crystalline Zn/Al hydrotalcites at different calcination temperatures. The samples and corresponding precursors were characterized by X-ray diffraction, BET, Fourier-transform infrared spectra, thermogravimetry/differential thermal analysis, and Hammett titration method. The experimental results showed that Zn/Al mixed oxides obtained from hydrotalcites were found to be more active than their individual oxides for glycolysis of PET. The relationship between catalytic performance and chemical–physical features of catalysts was established. In addition, a study for optimizing the glycolysis reaction conditions, such as the weight ratio of EG to PET, catalyst amount and reaction time, was performed. The conversion of PET and yield of bis(2-hydroxyethyl terephthalate) (BHET) reached about 92% and 79%, respectively, under the optimal experimental conditions. Moreover, it should be noted that Zn/Al mixed oxide not only provided an effective heterogeneous catalyst for glycolysis of poly(ethylene terephthalate), but also presented a novel method for decolorization of discarded colored polyester fabric.
机译：在这项研究中，使用锌/铝混合氧化物催化剂对聚对苯二甲酸乙二醇酯（PET）和乙二醇（EG）进行了糖酵解。通过在不同的煅烧温度下煅烧结晶的Zn / Al水滑石来制备这些混合氧化物。通过X射线衍射，BET，傅立叶变换红外光谱，热重分析/差热分析和Hammett滴定法对样品和相应的前体进行表征。实验结果表明，从水滑石中获得的Zn / Al混合氧化物比单独的氧化物对PET的糖酵解活性更高。建立了催化剂的催化性能与化学物理特征之间的关系。另外，进行了优化糖酵解反应条件的研究，例如EG与PET的重量比，催化剂量和反应时间。在最佳实验条件下，PET的转化率和对苯二甲酸双（2-羟乙基酯）（BHET）的产率分别达到约92％和79％。此外，应该指出的是，Zn / Al混合氧化物不仅为聚对苯二甲酸乙二酯的糖酵解提供了有效的非均相催化剂，而且提出了一种废弃的有色聚酯织物脱色的新方法。

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