Recycling of poly(ethylene terephthalate) waste through methanolic pyrolysis in a microwave reactor |
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| Institution: | 1. Chemistry Department and Center of Excellence in Nanotechnology (CENT), King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;2. Chemical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;3. Laboratory of Organic Chemical Technology, Department of Chemistry, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece;1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;2. State Key Laboratory for Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;1. Department of Chemistry, State University of Maringa, Maringa, Brazil;2. Department of Mechanical Engineering, State University of Maringa, Maringa, Brazil;3. Postgrad Program Mat Sci & Engn - Federal University Technology, Parana – UTFPR/LD, Londrina, Brazil;4. Department of Chemistry, Federal University of Piauí, Teresina, Brazil;1. University of Maribor, Faculty of Chemistry and Chemical Engineering, Laboratory for Separation Processes and Product Design, Smetanova 17, SI-2000 Maribor, Slovenia;2. University of Maribor, Faculty of Medicine, Department of Chemistry, Taborska 8, SI-2000 Maribor, Slovenia;1. Department of Chemistry, Mizoram University, Pachhunga University College Campus, Aizawl, 796001, Mizoram, India;2. Department of Chemistry, Mizoram University, Tanhril, Aizawl, 796004, Mizoram, India;3. Department of Environmental Science, Mizoram University, Tanhril, Aizawl, 796004, Mizoram, India |
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| Abstract: | 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 °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. |
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