Kinetics and characteristics of activator-assisted pyrolysis of municipal waste plastic and chlorine removal using hot filter filled with absorbents
2022
Jeong, Yong-Seong | Park, Ki-Bum | Kim, Joo-sik
Pyrolysis of municipal waste plastic was conducted using a two-stage pyrolysis process with auger and fluidized bed reactors. The current study comprises two parts: a kinetic study and pyrolysis experiments using activator-assisted pyrolysis. The kinetic study was performed using the distributed activation energy model, and it revealed that the average activation energy for activated molecules was 7 kJ/mol lower than that for unactivated molecules. The pyrolysis experiment confirmed that the activation of molecules resulted in an enhanced gas production. In particular, the methane and ethene yields increased by 11 and 8 wt%, respectively, when molecules were activated. A higher flow rate of the product gas used as the fluidizing gas resulted in a decrease in the gas yield. CaO and Na₂CO₃ were used as absorbents for chlorinated compounds produced during pyrolysis to reduce the level of Cl in the oil. The absorbents, at first, changed the product distribution, enhancing the production of mono-aromatics. In particular, the benzene yield with Na₂CO₃ amounted to 10 wt%. The two absorbents were excellent in reducing the Cl content in oil. Between the two absorbents, Na₂CO₃ proved to be the better, reducing the Cl content to 65 ppm.
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