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Separate two-step and continuous two-stage pyrolysis of a waste plastic mixture to produce a chlorine-depleted oil

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  • Park, Ki-Bum
  • Choi, Min-Jun
  • Chae, Da-Yeong
  • Jung, Jaeheum
  • Kim, Joo-Sik

Abstract

In this study, a separate two-step pyrolysis (using auger and fixed-bed reactors) and a continuous two-stage pyrolysis (using auger and fluidized bed reactors) were conducted. This two-step pyrolysis was conducted to understand the effect of a 300 °C thermal pretreatment with the auger reactor before main pyrolysis on the chlorine removal. The fixed-bed pyrolysis of a solid product obtained after the pretreatment produced an oil with 464 ppm chlorine. An oil with only 14 ppm of organic chlorine could be obtained when a solid containing CaO was pyrolyzed in the fixed-bed reactor. Thermal pretreatment also caused changes in the yield and product composition; pretreatment led to an increase in gas yield and aromatic content of the oil. In the continuous two-stage pyrolysis of a waste plastic mixture having 3 wt% polyvinyl chloride at 730 °C, chlorinated gases were removed in parallel from the outlet of the auger reactor line and through a CaO hot filter; this produced an oil with 6.3 ppm organic chlorine. In the two-stage pyrolysis, an aromatic-rich oil (80 wt%) was obtained. The two-stage pyrolysis successfully converted the waste plastic mixture into an oil which could be acceptable as a feedstock for petrochemical industries.

Suggested Citation

  • Park, Ki-Bum & Choi, Min-Jun & Chae, Da-Yeong & Jung, Jaeheum & Kim, Joo-Sik, 2022. "Separate two-step and continuous two-stage pyrolysis of a waste plastic mixture to produce a chlorine-depleted oil," Energy, Elsevier, vol. 244(PA).
    • Handle: RePEc:eee:energy:v:244:y:2022:i:pa:s0360544221028322
    DOI: 10.1016/j.energy.2021.122583
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    References listed on IDEAS

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    1. Panda, Achyut K. & Singh, R.K. & Mishra, D.K., 2010. "Thermolysis of waste plastics to liquid fuel: A suitable method for plastic waste management and manufacture of value added products--A world prospective," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(1), pages 233-248, January.
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    3. Park, Ki-Bum & Oh, Seung-Jin & Begum, Guzelciftci & Kim, Joo-Sik, 2018. "Production of clean oil with low levels of chlorine and olefins in a continuous two-stage pyrolysis of a mixture of waste low-density polyethylene and polyvinyl chloride," Energy, Elsevier, vol. 157(C), pages 402-411.
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    Cited by:

    1. Choudhary, Rajesh & Mukhija, Abhishek & Sharma, Subhash & Choudhary, Rohitash & Chand, Ami & Dewangan, Ashok K. & Gaurav, Gajendra Kumar & Klemeš, Jiří Jaromír, 2023. "Energy-saving COVID–19 biomedical plastic waste treatment using the thermal - Catalytic pyrolysis," Energy, Elsevier, vol. 264(C).
    2. Muhammad Irfan & Rao Adeel Un Nabi & Hammad Hussain & Muhammad Yasin Naz & Shazia Shukrullah & Hassan Abbas Khawaja & Saifur Rahman & Abdulnoor A. J. Ghanim & Izabela Kruszelnicka & Dobrochna Ginter-K, 2022. "Response Surface Methodology Analysis of Pyrolysis Reaction Rate Constants for Predicting Efficient Conversion of Bulk Plastic Waste into Oil and Gaseous Fuels," Energies, MDPI, vol. 15(24), pages 1-17, December.

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