Liquefaction of mixed plastics containing PVC and dechlorination by calcium-based sorbent

Thallada Bhaskar, Azhar Uddin, Jun Kaneko, Toshiaki Kusaba, Toshiki Matsui, Akinori Muto, Yusaku Sakata, Katshuhide Murata

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Abstract

The pyrolysis of PVC-containing mixed plastics (PVC/PP/PE/PS) was carried out at 430°C under atmospheric pressure by semibatch operation using a carbon composite of calcium carbonate sorbent (Ca-C) and also in the absence of sorbent (thermal). An amount of 4 g of Ca-C sorbent was used for consecutive 6 batches (each batch 10 g plastic) of the mixed plastic (PVC/PP/PE/PS:1/3/3/3) pyrolysis process. Hydrogen chloride and chlorinated hydrocarbons were produced during the pyrolysis of the mixed plastics containing PVC (PVC/PP/PE/PS). The Ca-C sorbent captured the hydrogen chloride evolved from the pyrolysis process. The theoretical sorbent capacity (71%) was utilized by repeatedly using the same sorbent for up to 5 consecutive batch processes without chlorine compounds in liquid products. The chlorinated hydrocarbons observed in the liquid products were obtained during run 5 (theoretical sorbent capacity 89%) and also during run 6 (theoretical sorbent capacity 106%). The hydrocarbons produced during the pyrolysis process reacted with the sorbent (during run 5) and yielded the chlorinated hydrocarbons in liquid products. X-ray diffraction studies revealed that the calcium carbonate sorbent was converted into calcium chloride during the pyrolysis process. The calcium-based sorbent was successfully utilized for the removal of chlorine content (inorganic and organic) from the pyrolysis process (PVC/PP/PE/PS:1/3/3/3) and produced halogen-free liquid products for 4 consecutive batch processes. The liquid products can be used as a fuel oil or feedstock in refinery.

Original languageEnglish
Pages (from-to)75-80
Number of pages6
JournalEnergy and Fuels
Volume17
Issue number1
DOIs
Publication statusPublished - Jan 2003

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ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Fuel Technology

Cite this

Bhaskar, T., Uddin, A., Kaneko, J., Kusaba, T., Matsui, T., Muto, A., Sakata, Y., & Murata, K. (2003). Liquefaction of mixed plastics containing PVC and dechlorination by calcium-based sorbent. Energy and Fuels, 17(1), 75-80. https://doi.org/10.1021/ef020091g