Metal-catalysed Poly(Ethylene) terephthalate and polyurethane degradations by glycolysis
Metal-catalysed Poly(Ethylene) terephthalate and polyurethane degradations by glycolysis
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DOI：
10.1016/j.jorganchem.2019.120972
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发表时间：
2019-12-01
影响因子：
2.3
通讯作者：
Garcia, Juventino J.
中科院分区：
文献类型：
--
作者：
Esquer, Raymundo;Garcia, Juventino J.
从聚氨酯和双酚A中回收多元醇聚对苯二甲酸（2-羟乙基）酯（BHET）采用多种简单的空气稳定金属盐、刘易斯酸、市售膦/亚磷酸酯配体与金属盐的混合物和低价的[Ni（COD）（2）]作为催化剂前体，在乙二醇作为酯交换剂的存在下进行。一个动力学研究与氯化钴导致的结论是，PET与金属盐的降解表现为一个连续的反应与诱导期。使用σ-供体或σ-供体/π-受体双齿膦配体，如dcype和dppe，沿着CoCl 2或[Ni（COD）（2）]改善PET降解过程。对于刚性和柔性PU，FeCl 3是最活跃的催化剂前体。(C)2019爱思唯尔B. V.保留所有权利。
The recovery of Polyol from PolyUretane (PU) and Bis(2-HydroxyEthyl) Terephthalate (BHET) from Poly(Ethylene) Terephthalate (PET) from plastic waste by transesterification reactions was achieved, by using a wide scope of simple air-stable metal salts, Lewis acids, mixtures of commercially available phosphine/phosphite ligands with metal salts and low-valent [Ni(COD)(2)] as catalytic precursors, in the presence of ethyleneglycol as a transesterification agent. A kinetic study with cobalt chloride led to the conclusion that the PET degradation with metal salts behaves as a consecutive reaction with an induction period. The use of sigma-donor or sigma-donor/pi-acceptor bidentate phosphine ligands, such as dcype and dppe, along with CoCl2 or [Ni(COD)(2)] improved the PET degradation process. For both rigid and flexible PU, FeCl3 was the most active catalyst precursor. (C) 2019 Elsevier B.V. All rights reserved.