De Wilde, JurayVan Geem, KevinBiebuyck, LouisLouisBiebuyck2025-02-052025-02-052024https://dial-mem.test.bib.ucl.ac.be/handle/123456789/39712This thesis presents the development of a novel hybrid modeling approach for the pyrolysis of high-density polyethylene (HDPE), integrating kinetic modeling for short chain lengths with the method of moments for longer chain lengths. The objective of this innovative approach is to combine the strengths of both modeling techniques to develop a fast, efficient and accurate model for HDPE. The equations were implemented with a reactor model developed by Ghent University, enabling the linkage of detailed chemistry with MoM. The comprehensive model encompasses 88 reaction families and tracks 2,840 reactions, including 114 involving aromatic compounds. However, due to computational constraints, the focus was on tracking fourteen key reaction families. Preliminary results of the model are promising when compared to experimental data. Long chain length alkanes (carbon numbers from C1 to C9) predictions were convincing, especially at higher temperatures. On the other hand, short chain length alkanes predictions (C10 and above) were going in the right direction, despite largely overestimating methane and ethylene concentrations, and underestimating those of other alkanes (C4 to C9). Despite these challenges, the hybrid model represents a significant step forward in accurately simulating the pyrolysis process of HDPE, with potential for further improvements.High density polyethyleneChemical recyclingPyrolysisMethod of momentsKinetic modelingtext::thesis::master thesisthesis:45352