期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 98, 期 -, 页码 214-220出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jaap.2012.09.007
关键词
Recycling; PET; Methanolic pyrolysis; Microwave irradiation
资金
- King Abdulaziz City for Science and Technology (KACST), Riyadh, Saudi Arabia [AR-27-101]
- King Fand University of Petroleum and Minerals, Dhahran, Saudi Arabia
- Laboratory of Organic Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, Greece
In this study, the methanolic pyrolysis (methanolysis) of poly(ethylene terephthalate) (PET) taken from waste soft-drink bottles, under microwave irradiation, is proposed as a recycling method with substantial energy saving. The reaction was carried out with methanol with and without the use of zinc acetate as catalyst in a sealed microwave reactor in which the pressure and temperature were controlled and recorded. Experiments under constant temperature or microwave power were carried out at several time intervals. The main product dimethyl-terephthalate was analyzed and identified by FTIR and DSC measurements. It was found that PET depolymerization, is favored by increasing temperature, time and microwave power. High degrees of depolymerization were measured at temperatures near 180 degrees C and at microwave power higher than 150 W. Most of the degradation was found to occur during the initial 5-10 min. Compared to conventional pyrolysis methods, microwave irradiation during methanolic pyrolysis of PET certainly results in shorter reaction times supporting thus the conclusion that this method is a very beneficial one for the recycling of PET wastes. (c) 2012 Elsevier B.V. All rights reserved.
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