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

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

Energy, 2022, vol. 244, issue PA

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.

Keywords: Chlorine; Polyvinylchloride; Pyrolysis; Two-stage; Waste plastic (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:244:y:2022:i:pa:s0360544221028322

DOI: 10.1016/j.energy.2021.122583

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