Investigation of Heavy Polyethylene Catalytic Pyrolysis

Han, Kim Lo

doi:10.5281/zenodo.7362353

Investigation of Heavy Polyethylene Catalytic Pyrolysis

Document Type : Original Article

Author

Kim Lo Han

Department of Chemical Engineering, Seoul University, Korea

https://doi.org/10.5281/zenodo.7362353

Abstract

Heavy polyethylene catalytic pyrolysis with 15% HZSM-5 catalyst was performed at 500 ° C in a semi-continuous stirrer reactor under nitrogen gas. In the first experiment, about 46.7% of the liquid product, 29.2% of the gas product and 4.5% of coke was produced. In the second experiment, with the changes made on the reactor and condenser, the liquid product output increased by about 8%. In a similar study, the effect of HZSM-5 zeolite catalyst acidity on the catalytic degradation of heavy polyethylene was evaluated. To have HZSM-5 with different acidities, sodium nitrate solution with different concentrations was used. Displacement of protons in the original sample by sodium cations (at room temperature for 4 hours) reduces the acidity of the samples. By adding sodium to HZSM-5 and ion transfer, the acidity of the catalyst decreased and the degradation temperature increased from 390 °C to 555 °C. The gases released from pyrolysis were also analyzed by gas chromatography and it was concluded that the selectivity of volatile products changes with catalytic acidity.

Keywords

Heavy polyethylene

catalytic pyrolysis

HZSM

Gas Chromatography

Subjects