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PET glycolysis optimization using ionic liquid [Bmin]ZnCl3 as catalyst and kinetic evaluation

2018; Associação Brasileira de Polímeros; Volume: 28; Issue: 5 Linguagem: Inglês

10.1590/0104-1428.00418

1984-7386

Carlos Vinícius Guimarães Silva, Eloi Alves da Silva Filho, Fabrício Uliana, Luciana Jesus, Carlos Vital Paixão de Melo, Rosângela Cristina Barthus, José Guilherme A. Rodrigues, Gabriela Vanini,

Carbon dioxide utilization in catalysis

In the present work, the depolymerization of polyethylene terephthalate (PET) was performed by the method of glycolysis with ethylene glycol. The process was carried out using a factorial design in the Box-Behnken optimization model, using a response surface methodology (RSM) in which three factors (time, temperature and mass ratio of ethylene glycol) were studied in three levels of variation (- 1, 0, +1) with two replicates of the center point, totalizing 15 experiments for which the yield of bis (2-hydroxyethyl) terephthalate (BHET) monomers formed in the process was chosen as response. In parallel, the Arrhenius kinetic test was used to determine the apparent activation energy (Ea) for the 1-butyl-3-methylimidazole trichlorozincate ([Bmin]ZnCl3) - catalyst used in the depolymerization process. The products of glycolysis obtained were characterized by spectroscopic techniques (FTIR), (1 H and 13C NMR), thermal analyses (TGA) and (DSC) and Mass Spectrometry LC-MS/MS hybrid Quadrupole-Orbitrap.