Additional steps in mechanical recyling of PET
| Autor: | Dennis Akira Kagohara, Jonas Age Saide Schwartzman, Alex Rodrigues Nogueira, Sandro Donnini Mancini, Maria Zanin |
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| Rok vydání: | 2010 |
| Předmět: |
Terephthalic acid
Aqueous solution business.product_category Renewable Energy Sustainability and the Environment Strategy and Management Industrial and Manufacturing Engineering Thermogravimetry chemistry.chemical_compound chemistry Elemental analysis Sodium hydroxide Bottle Polyethylene terephthalate Organic chemistry Gas chromatography business General Environmental Science Nuclear chemistry |
| Zdroj: | Journal of Cleaner Production. 18:92-100 |
| ISSN: | 0959-6526 |
| DOI: | 10.1016/j.jclepro.2009.09.004 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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