Post consumer pet depolymerization by acid hydrolysis
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Data
2007-02-01
Autores
Mancini, Sandro Donnini
Zanin, Maria
Título da Revista
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Título de Volume
Editor
Taylor & Francis Inc
Resumo
The reaction of post-consumer poly(ethylene terephthalate) with aqueous solutions of sulfuric acid 7.5M was investigated in terms of temperature, time and particle size. The reaction extent reached 80% in four days at 100 degrees C and 90% in 5 hours at 135 degrees 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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Palavras-chave
chemical recycling, hydrolysis, PET, sulfuric acid, TPA
Como citar
Polymer-plastics Technology and Engineering. Philadelphia: Taylor & Francis Inc., v. 46, n. 2, p. 135-144, 2007.