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Catalysts 2017, 7(2), 43; doi:10.3390/catal7020043

Poisoning Effects of Water and Dyes on the [Bmim][BF4] Catalysis of Poly(Ethylene Terephthalate) (PET) Depolymerization under Supercritical Ethanol

1
Grupo de Materiais Poliméricos e Compósitos (GMPC), Departamento de Química, Universidade Estadual de Maringá (UEM), 87020-900 Maringá-PR, Brazil
2
Estereoquímica de Compostos Orgânicos e Docking Molecular (ECO-DM), Departamento de Química, Universidade Estadual de Maringá (UEM), 87020-900 Maringá-PR, Brazil
3
Programa de Pós-graduação em Ciência e Engenharia de Materiais (PPGCEM), University Tecnológica Federal do Paraná (UTFPR-LD), 860368-370 Londrina, PR, Brazil
4
Program Pós-grad. Biotecnologia Aplicada a Agricultura UNIPAR), 87502-210 Umuarama, PR, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Dionysios (Dion) Demetriou Dionysiou
Received: 9 November 2016 / Revised: 11 January 2017 / Accepted: 12 January 2017 / Published: 28 January 2017
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Abstract

Supercritical ethanolysis (scEtOH) is a method that allows the production of monomers, e.g., diethyl terephthalate (DET), from Polyethylene terephthalate PET chemical recycling. The use of the ionic liquids (ILs) such as 1-n-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) as a catalyst has advantages in such processes by enhancing the yield at reduced times, as shown in previous work from our lab. However, the effects of water and dyes (from the coloured PET-bottles) regarding those advantages have not been investigated. Here, a study of the effects of water and dyes on IL-catalysis is provided. Results showed that the yield related to DET formation was 98% when anhydrous ethanol was employed, but decreased to 30% (or less) when water was present in the reaction even in low amounts. Furthermore, the DET-formation yield also decreased to 66% or to 21% if 2-aminoanthraquinone or zinc phthalocyanine were present, respectively, even in anhydrous conditions. Poisoning effect on the IL-catalysis was observed in both cases. Thus, these data are relevant for expanding the study of ILs as catalysts in this and other reaction systems. View Full-Text
Keywords: polyethylene terephthalate; depolymerization; supercritical ethanol; ionic liquids; dyes-poisoning effect in catalysis polyethylene terephthalate; depolymerization; supercritical ethanol; ionic liquids; dyes-poisoning effect in catalysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Nunes, C.S.; Souza, P.R.; Freitas, A.R.; Silva, M.J.V.; Rosa, F.A.; Muniz, E.C. Poisoning Effects of Water and Dyes on the [Bmim][BF4] Catalysis of Poly(Ethylene Terephthalate) (PET) Depolymerization under Supercritical Ethanol. Catalysts 2017, 7, 43.

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