Kinetics and characteristics of activator-assisted pyrolysis of municipal waste plastic and chlorine removal using hot filter filled with absorbents

Yong-Seong Jeong, Ki-Bum Park and Joo-Sik Kim

Energy, 2022, vol. 238, issue PB

Abstract: 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.

Keywords: Municipal waste plastic; Activator-assisted pyrolysis; Calcium oxide; Sodium carbonate; Chlorine (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:238:y:2022:i:pb:s0360544221020624

DOI: 10.1016/j.energy.2021.121814

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