Degradation of poly(ethylene terephthalate) using ionic liquids

被引：173
作者：
Wang, Hui [1 ]
Li, Zengxi [1 ]
Liu, Yanqing [1 ]
Zhang, Xiangping [2 ]
Zhang, Suojiang [2 ]
机构：
[1] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
[2] Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
来源：
GREEN CHEMISTRY | 2009年 / 11卷 / 10期
基金：
国家杰出青年科学基金; 国家高技术研究发展计划(863计划);
关键词：
SOFT-DRINK BOTTLES; SULFURIC-ACID; CHLORIDE; DEPOLYMERIZATION; HYDROLYSIS; GLYCOLYSIS; WASTE; POLYETHYLENE; DISSOLUTION; CELLULOSE;
D O I：
10.1039/b906831g
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The degradation of poly(ethylene terephthalate) (PET) was successfully achieved using ionic liquids. The products were separated according to their solubilities in boiling water. Average molecular weights of the main product were determined by gel permeation chromatography (GPC). The physicochemical properties of the product have been characterized by scanning electron microscopy equipped with an energy dispersive X-ray analyzer (SEM/EDX), X-ray diffractometer, infrared spectrometric analyzer, differential scanning calorimeter, and thermogravimetric analysis instrument. The influences of experimental parameters, such as the reaction time, reaction temperature, and addition of different catalysts on the solubility of PET were investigated. A study on the recycling of the ionic liquid shows that ionic liquid could be used repeatedly. Moreover, the solubility of PET in the recycled ionic liquid is higher than that in fresh ionic liquid. Further study shows that the increase of solubility in the recycled ionic liquid is attributable to the presence of a minor amount of water. A mechanism of the degradation of PET in 1-butyl-3-methylimidazolium chloride ([bmim]Cl) was proposed. In addition, the kinetics of this reaction was investigated. Results show that this degradation process is a first-order kinetic reaction and the activation energy is 232.79 kJ mol(-1).
引用
收藏
页码：1568 / 1575
页数：8
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