Additional steps in mechanical recyling of PET |
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| Authors: | Sandro Donnini Mancini Jonas Age Saide Schwartzman Alex Rodrigues Nogueira Dennis Akira Kagohara Maria Zanin |
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| Institution: | 1. Environmental Engineering Department. Universidade Estadual Paulista (UNESP), Campus Experimental de Sorocaba, Av. 3 de Março, 511 – Altos da Boa Vista, Sorocaba-SP, CEP 18087-180, Brazil;2. Regional Incubator of Popular Cooperatives (INCOOP), Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luís, km 235, São Carlos-SP, CEP 13565-905, Brazil;1. INGESIA Engineering and Enviroment S.L., Spain;2. Department of Chemical Engineering University of Granada, 18071 Granada Spain;3. Department of Chemical Engineering University of Granada, 18071 Granada Spain;4. Department of Chemical Engineering University of Granada, 18071 Granada Spain;5. Department of Chemical Engineering University of Granada, 18071 Granada Spain;6. Department of Chemical Engineering University of Granada, 18071 Granada Spain;1. College of Engineering, Department of Chemical Engineering, King Saud University, 11421 Riyadh, Saudi Arabia;2. Department of Chemical and Biomolecular Engineering and Center for Ultramicrochemical Process Systems, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, South Korea;3. Department of Polymer Engineering, Faculty of Chemical and Natural Resource Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia;1. Centre for Fire, Explosive and Environment Safety, DRDO, Delhi-54, India;2. Department of Chemistry, Indian Institute of Technology Delhi, New Delhi-16, India;1. School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310, Skudai, JohorBahru, Malaysia;2. Centre of Environmental Sustainability and Water Security, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia;3. Chemical Engineering Department, Faculty of Engineering, University of Port-Harcourt, Port-Harcourt, Nigeria;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 |
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| Abstract: | This study presents the laboratory scale results of an extra step in Poly (ethylene terephthalate) – PET mechanical recycling (grinding, washing, drying and reprocessing): a chemical washing after the conventional one. Cooking oil PET bottle flakes were washed in water and then subjected to a reaction with an aqueous solution of sodium hydroxide 5 M at 90 °C for 10 min (chemical washing). After rinsing and drying, the flakes were characterized by thermogravimetry, gas chromatography and elemental analysis tests. The results indicated that the chemically washed material had higher purity than PET washed only with water: 99.3% and 96.7%, respectively, which undoubtedly implies properties, applications and prices closer to those of virgin resin. The production of purified terephthalic acid (TPA) from the chemical washing residue was optimized and reached a purity of 99.6%. Despite the results, the use of chemically washed PET and of TPA obtained is not recommended for direct contact with food, since they still contain some impurities. |
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