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首页> 外文期刊>Catalysis in industry >Sodium Methoxide Catalyzed Depolymerization of Waste Polyethylene Terephthalate Under Microwave Irradiation
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Sodium Methoxide Catalyzed Depolymerization of Waste Polyethylene Terephthalate Under Microwave Irradiation

机译：微波辐射下甲醇氧化钠催化废聚乙烯对苯二甲酸乙二醇酯的解聚

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摘要

Chemical recycling of polyethylene terephthalate (PET) to produce terephthalic acid (TPA) was studied using in situ hydrolysis with sodium methoxide in methanol and dimethyl sulfoxide (DMSO) as solvent under microwave irradiation. The microwave-assisted reaction was carried out at different temperatures, and reaction time between 5 to 30 min. High degrees of depolymerization were examined at temperature near 70°C at microwave power 300 W. The reaction was carried out in a sealed microwave reactor in which the time and temperature were controlled and recorded. The products were mainly monomers such as TPA and ethylene glycol (EG) which were isolated and purified for further analysis. Monomethyl terephthalate, dimethyl terephthalate, and terephthalic acid were formed initially then converted to TPA as a single monomer product. Purified, TPA was analyzed and identified by NMR, TGA, DSC and FTIR. It was observed that the reaction greatly depends on the amount of sodium methoxide, the volume of methanol and DMSO used, the reaction time, and temperature. Compared to conventional heating methods, the time needed to achieve complete degradation of PET was significantly reduced to 5 min by using microwave irradiation and sodium methoxide catalyst. This has led to substantial saving in energy and cost supporting the conclusion that this proposed recycling process is very beneficial for the recycling of PET wastes.
机译：以甲醇钠为溶剂，二甲基亚砜（DMSO）为溶剂，在微波辐射下原位水解聚对苯二甲酸乙二醇酯（PET）制备对苯二甲酸（TPA）。微波辅助反应在不同的温度下进行，反应时间在5到30分钟之间。在接近70°C的温度下，在微波功率300 W下检查高度解聚。反应在密封的微波反应器中进行，在该反应器中控制并记录时间和温度。产物主要为TPA和乙二醇（EG）等单体，经分离纯化后用于进一步分析。对苯二甲酸单甲酯、对苯二甲酸二甲酯和对苯二甲酸最初形成，然后作为单一单体产物转化为TPA。纯化后的TPA经核磁共振、热重分析、差示扫描量热分析和红外光谱分析鉴定。结果表明，反应在很大程度上取决于甲醇钠的用量、甲醇和二甲基亚砜的用量、反应时间和温度。与传统加热方法相比，使用微波辐射和甲醇钠催化剂可将PET完全降解所需的时间显著减少至5分钟。这大大节约了能源和成本，支持了这样一个结论，即拟议的回收工艺对PET废物的回收非常有益。

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