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Steam gasification of polyethylene terephthalate (PET) with CaO in a bubbling fluidized bed gasifier for enriching H2 in syngas with Response Surface Methodology (RSM)

Author

Listed:
  • Li, Shouzhuang
  • Inayat, Muddasser
  • Järvinen, Mika

Abstract

Polyethylene terephthalate (PET) is widely used as packaging and textile materials. Although PET bottles recycling is mature in many countries, steam gasification could be a solution to recover valuable products from end-of-life PET. CaO has been investigated as an absorbent to capture CO2 and improve H2 production in gasification but mostly it was analyzed as an individual effect. As the main novelty, this work studied not only the individual effect of temperature, steam/PET ratio and CaO/PET ratio on gas products, tars, and char but also the combined interaction of them on gas yields using response surface methodology in PET steam gasification with CaO. The experimental work was conducted in a bubbling fluidized bed gasifier and mathematical models were fitted with considering all significant terms. The results showed that H2 yield was doubled at 800 °C but increasing by 44% at 750 °C when the CaO/PET ratio raised from 0 to 2.0. Thus, temperature, CaO, and their interaction had significant effect on H2 yield, which was also reflected by the P-values calculated from the coefficients of the mathematical models. Tar analysis showed that benzene accounted for 80 wt% in tar products and adding CaO can reduce benzene by 34%. However, CO2 increased with adding CaO at temperatures of 700 °C – 800 °C implying that CaO mainly functioned as a catalyst instead of an absorbent. The models fitted well in R2 and model validations with non-model-fitting points. Therefore, the models can be applied for the prediction of gas product yield in the studied range.

Suggested Citation

  • Li, Shouzhuang & Inayat, Muddasser & Järvinen, Mika, 2023. "Steam gasification of polyethylene terephthalate (PET) with CaO in a bubbling fluidized bed gasifier for enriching H2 in syngas with Response Surface Methodology (RSM)," Applied Energy, Elsevier, vol. 348(C).
  • Handle: RePEc:eee:appene:v:348:y:2023:i:c:s0306261923009005
    DOI: 10.1016/j.apenergy.2023.121536
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    References listed on IDEAS

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    1. Inayat, Abrar & Inayat, Muddasser & Shahbaz, Muhammad & Sulaiman, Shaharin A. & Raza, Mohsin & Yusup, Suzana, 2020. "Parametric analysis and optimization for the catalytic air gasification of palm kernel shell using coal bottom ash as catalyst," Renewable Energy, Elsevier, vol. 145(C), pages 671-681.
    2. Yan, Xianyao & Li, Yingjie & Sun, Chaoying & Zhang, Chunxiao & Yang, Liguo & Fan, Xiaoxu & Chu, Leizhe, 2022. "Enhanced H2 production from steam gasification of biomass by red mud-doped Ca-Al-Ce bi-functional material," Applied Energy, Elsevier, vol. 312(C).
    3. Li, Bin & Wei, Liangyuan & Yang, Haiping & Wang, Xianhua & Chen, Hanping, 2014. "The enhancing mechanism of calcium oxide on water gas shift reaction for hydrogen production," Energy, Elsevier, vol. 68(C), pages 248-254.
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    More about this item

    Keywords

    PET; Steam gasification; CaO; Response surface methodology; H2; CO2;
    All these keywords.

    JEL classification:

    • H2 - Public Economics - - Taxation, Subsidies, and Revenue

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