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Two-stage thermochemical conversion of polyethylene terephthalate using steam to produce a clean and H2- and CO-rich syngas

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  • Kim, Jae-Kyung
  • Jeong, Yong-Seong
  • Kim, Jong-Woo
  • Kim, Joo-Sik

Abstract

This study deals with thermochemical conversion of polyethylene terephthalate using steam and a two-stage process having fluidized bed packed bed reactors. In the study, the temperatures of the fluidized bed reactor and packed reactor were varied in the range of 600–800 and 700−800 °C, respectively. In the experiments, active carbon used as a tar removal additive sharply increased the yields of syngas, char, H2, and CO and decreased the condensed tar yield. Although toluene, styrene, naphthalene, biphenyl, and anthracene were found in the syngas obtained without active carbon, none were found in the experiment with active carbon. The tar content in the gas with active carbon was 13 mg/Nm3. A high tar-cracking reactor temperature and a high steam/fuel ratio favored the production of syngas and H2. In the present study, the highest H2 yield was 93 g/kg-feed, the highest H2 content in syngas was 53 vol%, and the CO yield was 418 g/kg-feed. Also, a long-term thermochemical conversion of PET was explored for 4 h, and there were no operational problems during the experiment. In the long-term operation, tar appeared only after 2 h reaction time, and anthracene appeared only in the gas sample drawn after 4 h reaction time.

Suggested Citation

  • Kim, Jae-Kyung & Jeong, Yong-Seong & Kim, Jong-Woo & Kim, Joo-Sik, 2023. "Two-stage thermochemical conversion of polyethylene terephthalate using steam to produce a clean and H2- and CO-rich syngas," Energy, Elsevier, vol. 276(C).
  • Handle: RePEc:eee:energy:v:276:y:2023:i:c:s0360544223010459
    DOI: 10.1016/j.energy.2023.127651
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    References listed on IDEAS

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    1. Kim, Jong-Woo & Jeong, Yong-Seong & Kim, Joo-Sik, 2022. "Bubbling fluidized bed biomass gasification using a two-stage process at 600 °C: A way to avoid bed agglomeration," Energy, Elsevier, vol. 250(C).
    2. Jeong, Yong-Seong & Park, Ki-Bum & Kim, Joo-Sik, 2020. "Hydrogen production from steam gasification of polyethylene using a two-stage gasifier and active carbon," Applied Energy, Elsevier, vol. 262(C).
    3. Jeong, Yong-Seong & Kim, Jong-Woo & Seo, Myung-Won & Mun, Tae-Young & Kim, Joo-Sik, 2021. "Characteristics of two-stage air gasification of polystyrene with active carbon as a tar removal agent," Energy, Elsevier, vol. 219(C).
    4. Fernandez, Enara & Santamaria, Laura & Amutio, Maider & Artetxe, Maite & Arregi, Aitor & Lopez, Gartzen & Bilbao, Javier & Olazar, Martin, 2022. "Role of temperature in the biomass steam pyrolysis in a conical spouted bed reactor," Energy, Elsevier, vol. 238(PC).
    5. Choi, Min-Jun & Jeong, Yong-Seong & Kim, Joo-Sik, 2021. "Air gasification of polyethylene terephthalate using a two-stage gasifier with active carbon for the production of H2 and CO," Energy, Elsevier, vol. 223(C).
    6. Cho, Min-Hwan & Mun, Tae-Young & Kim, Joo-Sik, 2013. "Air gasification of mixed plastic wastes using calcined dolomite and activated carbon in a two-stage gasifier to reduce tar," Energy, Elsevier, vol. 53(C), pages 299-305.
    7. Choi, Young-Kon & Cho, Min-Hwan & Kim, Joo-Sik, 2015. "Steam/oxygen gasification of dried sewage sludge in a two-stage gasifier: Effects of the steam to fuel ratio and ash of the activated carbon on the production of hydrogen and tar removal," Energy, Elsevier, vol. 91(C), pages 160-167.
    8. Jeong, Yong-Seong & Choi, Young-Kon & Kim, Joo-Sik, 2019. "Three-stage air gasification of waste polyethylene: In-situ regeneration of active carbon used as a tar removal additive," Energy, Elsevier, vol. 166(C), pages 335-342.
    9. Wang, Zhiwei & Burra, Kiran G. & Li, Xueqin & Zhang, Mengju & He, Xiaofeng & Lei, Tingzhou & Gupta, Ashwani K., 2020. "CO2-assisted gasification of polyethylene terephthalate with focus on syngas evolution and solid yield," Applied Energy, Elsevier, vol. 276(C).
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    1. Suarez, Mayra Alejandra & Januszewicz, Katarzyna & Cortazar, Maria & Lopez, Gartzen & Santamaria, Laura & Olazar, Martin & Artetxe, Maite & Amutio, Maider, 2024. "Selective H2 production from plastic waste through pyrolysis and in-line oxidative steam reforming," Energy, Elsevier, vol. 302(C).

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