Post Consumer Pet Depolymerization by Acid Hydrolysis |
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Authors: | Sandro Donnini Mancini Maria Zanin |
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Affiliation: | 1. Environmental Engineering Department , Universidade Estadual Paulista (UNESP), Unidade Diferenciada Sorocaba/Iperó , Altos da Boa Vista, Sorocaba-SPmancini@sorocaba.unesp.br;3. Materials Engineering Department (DEMa) , Recycling Residues Center (3R-NRR), Universidade Federal de S?o Carlos (UFSCar), Rodovia Washington Luís , S?o Carlos-SP |
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Abstract: | The reaction of post-consumer poly(ethylene terephthalate) with aqueous solutions of sulfuric acid 7.5 M was investigated in terms of temperature, time and particle size. The reaction extent reached 80% in four days at 100°C and 90% in 5 hours at 135°C. TPA obtained was purified and considered in the same level of quality of the commercial one after tests of elemental analysis, particle size and color. It was concluded that the hydrolysis occurred preferentially at the chain ends and superficially, having as controller mechanism the acid diffusion into the polymer structure. The shrinking-core model can explain the reaction kinetics. |
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Keywords: | Chemical recycling Hydrolysis PET Sulfuric acid TPA |
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