Poisoning Effects of Water and Dyes on the BmimBF4 Catalysis of PolyEthylene Terephthalate PET Depolymerization under Supercritical EthanolReportar como inadecuado


Poisoning Effects of Water and Dyes on the BmimBF4 Catalysis of PolyEthylene Terephthalate PET Depolymerization under Supercritical Ethanol


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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

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 BmimBF4 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





Autor: Cátia S. Nunes 1, Paulo R. Souza 1, Adonilson R. Freitas 1, Michael Jackson Vieira da Silva 2, Fernanda A. Rosa 2 and Edvani C. Muniz 1,3,4,*

Fuente: http://mdpi.com/



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