Despolimerização Química de PET Grau Garrafa Pós-consumo na Presença de um Catalisador Catiônico, o Brometo de Hexadeciltrimetrilamônio (CTAB)

Abstract

In this wordok, a new analytical methodology has been developed for the chemical roecycling of post-consumption bottle-grade poly(ethylene therpthalate), PETpc through depolymerization reaction in alkaline solution (NaOH solution 7.5 mol L-1 at 100°C), using surfactant cetyl trimethyl ammonium bromide (CTAB, 1 × 10-2 mol L -1) as catalyst. The presence CTAB increased the reaction performance by ca. 85%, whiole the reaction time was decreased from 6 to 2 h when the mixture NaOH/CTAB was used in a proportion of 4:1 (% v/v) with 2 g of PET pc. The final product the monomer terephthalic acid (TPA), was characterized by thermogravimetry analysis, differential scanning calorimetry, Fourier transform infrared spectroscopy and mass spectrometry. The results were compared with those for the raw material, PETpc. Furthermore, the catalyst CTAB remained in the alkaline environment (aqueous phase), without interfering with the TPA purification process.