Glycolysis of poly(ethylene terephthalate) wastes in xylene
Glycolysis of poly(ethylene terephthalate) wastes in xylene
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DOI：
10.1002/(sici)1097-4628(19980919)69:12
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发表时间：
1998-09
影响因子：
3
通讯作者：
G. Güçlü;A. Kas¸göz;S. Özbudak;S. Özgümüş;M. Orbay
中科院分区：
文献类型：
--
作者：
G. Güçlü;A. Kas¸göz;S. Özbudak;S. Özgümüş;M. Orbay
为了回收单体或制备适用于其他聚合物的中间体，醋酸锌催化废聚对苯二甲酸乙二醇酯 (PET) 的糖酵解，使用乙二醇或丙二醇，PET/乙二醇摩尔比为 1 : 0.5–1 : 3，在二甲苯中于 170–245°C 进行。在多相反应过程中，解聚产物从分散的 PET/乙二醇液滴转移到二甲苯介质中，将平衡转移到糖酵解。 220°C 下的乙二醇 (EG) 反应获得了最佳结果，产生了 80 mol% 对苯二甲酸双-2-羟乙酯单体和 20 mol% 相当纯的结晶形式的二聚体部分。在 PET 糖酵解中使用二甲苯的其他优点是改善高 PET/EG 比例下的混合以及过量乙二醇的回收可能性，过量乙二醇在低温下与二甲苯相分离。 © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 2311–2319, 1998
To reclaim the monomers or prepare intermediates suitable for other polymers zinc acetate catalayzed glycolysis of waste poly(ethylene terephthalate) (PET) was carried out with ethylene or propylene glycol, with PET/glycol molar ratios of1 : 0.5–1 : 3, in xylene at 170–245°C. During the multiphase reaction, depolymerization products transferred to the xylene medium from the dispersed PET/glycol droplets, shifting the equilibrium to glycolysis. Best results were obtained from the ethylene glycol (EG) reaction at 220°C, which yielded 80 mol % bis-2-hydroxyethyl terephthalate monomer and 20 mol % dimer fractions in quite pure crystalline form. Other advantages of employment of xylene in glycolysis of PET were improvement of mixing at high PET/EG ratios and recycling possibility of excess glycol, which separates from the xylene phase at low temperatures. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 2311–2319, 1998