Poisoning Effects of Water and Dyes on the [Bmim][BF4] Catalysis of Poly(Ethylene Terephthalate) (PET) Depolymerization under Supercritical Ethanol
| Autor: | Michael J. V. da Silva, Fernanda A. Rosa, Edvani C. Muniz, Paulo R. R. De Souza, Adonilson R. Freitas, Cátia S. Nunes |
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| Rok vydání: | 2017 |
| Předmět: |
Ethanol
Depolymerization 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis Supercritical fluid 0104 chemical sciences chemistry.chemical_compound chemistry Yield (chemistry) Ionic liquid Anhydrous Polyethylene terephthalate Organic chemistry Physical and Theoretical Chemistry 0210 nano-technology polyethylene terephthalate depolymerization supercritical ethanol ionic liquids dyes-poisoning effect in catalysis |
| Zdroj: | Catalysts; Volume 7; Issue 2; Pages: 43 |
| ISSN: | 2073-4344 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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