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Experimental determination of quantitative yields from polymethyl methacrylate (PMMA) flash pyrolysis in a fluidized bed reactor via online FTIR gas analysis – Supplementary dataset

Pielsticker, Stefan^RWTH* ; Hendricks, Katja^RWTH* ; Knevels, Christoph^RWTH* ; Lehnertz, Marcus^RWTH* ; Palkovits, Regina^RWTH* ; Kneer, Reinhold^RWTH*

2025

Online
DOI: 10.18154/RWTH-2024-08099
URL: https://publications.rwth-aachen.de/record/992259/files/Data_set.zip

Einrichtungen

1. Lehrstuhl für Wärme- und Stoffübertragung (412610)
2. Institut für Technische und Makromolekulare Chemie (154005)
3. Fachgruppe Chemie (150000)

Projekte

1. DFG project G:(GEPRIS)240954932 - Experimentelle Untersuchung von Pyrolyse- und Koksumsatzkinetiken in einem „Well-Stirred-Reactor“ unter atmosphärischen und druckbeaufschlagten Bedingungen (A01) (240954932) (240954932)
2. DFG project G:(GEPRIS)215035359 - TRR 129: Oxyflame - Entwicklung von Methoden und Modellen zur Beschreibung der Reaktion fester Brennstoffe in einer Oxyfuel-Atmosphäre (215035359) (215035359)
3. PFKA008 - Cluster 4 Plastics Recycling (EXS-PF-PFKA008) (EXS-PF-PFKA008)
4. ERS Prep Fund - Exploratory Research Space: Prep Fund als Anschubfinanzierung zur Schließung strategischer Lücken (EXS-PF) (EXS-PF)
5. EXS - Excellence Strategy (EXS) (EXS)

Inhaltliche Beschreibung (Schlagwörter)
Chemical recycling (frei) ; Decomposition products (frei) ; Fluidized bed reactor (frei) ; Online FTIR gas analysis (frei) ; PMMA pyrolysis (frei)

Kurzfassung
Chemical recycling processes, such as pyrolysis, have the potential to break down the polymer (e.g., polymethyl methacrylate, PMMA) into its main building blocks (monomers), and thus enable to preserve the full functionality in closed-loop recycling processes. In this study, products from flash pyrolysis of PMMA are quantitatively determined using an ex-situ exhaust gas analysis by means of Fourier-transform infrared (FTIR) spectroscopy. To achieve this, the FTIR is additionally calibrated for methyl methacrylate (MMA) with an MMA/N2 mixture of various concentrations. Flash pyrolysis conditions (heating rates of approximately 1000 K/s are realized with a small-scale fluidized bed reactor operated with a nitrogen atmosphere and temperatures between 573 and 873 K with a continuous feed of PMMA granules. The experiments reveal MMA yields up to 90 % at 673 K. With increasing temperature, the MMA yield drops to approximately 50 % at 873 K. In return, the yields of the MMA decomposition products such as carbon dioxide (CO2), methane (CH4), carbon monoxide (CO), propylene (C3H6), and formaldehyde (CH2O) increase. The approximated residence time of 20 to 30 seconds leads to a stronger decomposition of the MMA into its fragments (especially at higher temperatures) than in other studies, which can be well modeled with a single first-order decomposition mechanism. A detailed analysis of captured condensate reveals a high purity of MMA, which enables the feedback into the polymerization process.

OpenAccess:
ZIP
(additional files)

Dokumenttyp
Dataset

Format
online

Sprache
English

Interne Identnummern
RWTH-2024-08099
Datensatz-ID: 992259

Beteiligte Länder
Germany