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首页> 外文期刊>Journal of Applied Polymer Science >Microwave assisted glycolysis of poly(ethylene terephthalate) catalyzed by 1-butyl-3-methylimidazolium bromide ionic liquid
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Microwave assisted glycolysis of poly(ethylene terephthalate) catalyzed by 1-butyl-3-methylimidazolium bromide ionic liquid

机译：1-丁基-3-甲基咪唑鎓溴化物离子液体催化的聚对苯二甲酸乙二醇酯的微波辅助糖解

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摘要

The combination of ionic liquid (IL) associated with microwave energy may have some potential application in the chemical recycling of poly (ethylene terephthalate). In this processes, glycolysis of waste poly (ethylene terephthalate) recovered from bottled water containers were thermally depolymerized with solvent ethylene glycol (EG) in the presence of 1-butyl-3-methyl imidazolium bromide ([bmim]Br) as catalyst (IL) under microwave condition. It was found that the glycolysis products consist of bis (2-hydroxyethyl) terephthalate (BHET) monomer that separated from the catalyst IL in pure crystalline form. The conversion of PET reach up to 100% and the yield of BHET reached 64% (wt %). The optimum performance was achieved by the use of 1-butyl-3-methyl imidazolium bromide as a catalyst, microwave irradiations temperature (170-175 degrees C) and reaction time 1.75-2 h. The main glycolysis products were analyzed by H-1 NMR, C-13 NMR, LC-MS, FTIR, DSC, and TGA. When compared to conventional heating methods, microwave irradiation during glycolysis of PET resulted in short reaction time and more control over the temperature. This has allowed substantial saving in energy and processing cost. In addition, a more efficient, environmental-friendly, and economically feasible chemical recycling of waste PET was achieved in a significantly reduced reaction time. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41666.
机译：与微波能量相关的离子液体（IL）的组合在聚对苯二甲酸乙二醇酯的化学回收中可能具有某些潜在的应用。在此过程中，在有1-丁基-3-甲基咪唑鎓溴化物（[bmim] Br）作为催化剂（IL）的情况下，从溶剂瓶（EG）对从瓶装水容器中回收的废聚对苯二甲酸乙二醇酯的糖酵解进行热解聚。 ）在微波条件下。发现糖酵解产物由双（2-羟乙基）对苯二甲酸酯（BHET）单体组成，其以纯结晶形式与催化剂IL分离。 PET的转化率高达100％，BHET的产率达到64％（wt％）。通过使用1-丁基-3-甲基咪唑鎓溴化物作为催化剂，微波辐射温度（170-175摄氏度）和反应时间1.75-2小时获得了最佳性能。主要糖酵解产物通过H-1 NMR，C-13 NMR，LC-MS，FTIR，DSC和TGA分析。与常规加热方法相比，PET糖酵解过程中的微波照射缩短了反应时间，并更好地控制了温度。这已经大大节省了能源和加工成本。另外，在显着减少的反应时间中，实现了废PET的更有效，环保和经济可行的化学回收。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41666。

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