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Étude expérimentale de la pyrolyse de poly(téréphtalate d’éthylène) (PET) : caractérisation fine des produits et de leur cinétique de formation

Abstract : Pyrolysis is the primary step in all thermochemical transformations of solids and therefore the detailed characterization of the pyrolysis products and the understanding of the involved mechanisms are mandatory. In this context, this PhD thesis aims to study the slow pyrolysis of PET using different analytical devices. In the first part, slow pyrolysis experiments (5 °C/min) were carried out in a tubular reactor for four final temperatures ranging from 410 °C to 480 °C. Unlike other studies from the literature, light products as well as heavy products were identified. The non-condensable gas was analyzed online using Gas micro-Chromatography (μ-GC), which allows acquiring the gas temporal profiles. The carbonyl compounds were trapped, derivatized and analyzed by High Performance - Liquid Chromatography (HPLC). The waxy products were characterized by Fourier Transform Infrared Spectroscopy (FTIR) and by Ion Cyclotron Resonance Mass Spectrometry (FT-ICR MS) using an Electrospray Ionization (ESI). Some waxy molecules were quantified by Gas Chromatography / Mass Spectrometry and Flame Ionization Detection (GC/MS-FID). The characterization of the solid residue was performed by FT-ICR MS coupled with Laser Desorption ionization (LDI). In the second part, the formation kinetics of volatile compounds during PET pyrolysis was studied using a Thermogravimetric Analyzer coupled with mild ionization methods (SPI: Single Photon Ionization; REMPI: Resonance Enhanced Multiple Photon Ionization; APCI: Atmospheric Pressure Chemical Ionization). The combination of these different techniques allowed a detailed characterization of the products and consequently the identification of reaction pathways of PET degradation, which are mostly molecular pathways.
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Submitted on : Tuesday, January 11, 2022 - 2:53:17 PM
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Asma Dhahak. Étude expérimentale de la pyrolyse de poly(téréphtalate d’éthylène) (PET) : caractérisation fine des produits et de leur cinétique de formation. Génie des procédés. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0219⟩. ⟨tel-02529704⟩



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