SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (2): 400-406.DOI: 10.1016/j.cjche.2017.08.001

• Energy, Resources and Environmental Technology • 上一篇    下一篇

Molten waste plastic pyrolysis in a vertical falling film reactor and the influence of temperature on the pyrolysis products

Zechen Jin, Dezhen Chen, Lijie Yin, Yuyan Hu, Huangqing Zhu, Liu Hong   

  1. Thermal and Environmental Engineering Institute, Tongji University, Shanghai 200092, China
  • 收稿日期:2017-03-29 修回日期:2017-08-02 出版日期:2018-02-28 发布日期:2018-03-16
  • 通讯作者: Lijie Yin
  • 基金资助:

    Supported by the National Natural Science Foundation of China (51503154), Major Projects of China Water Pollution Control and Treatment Science and Technology (2017ZX07202005), and the Shanghai Municipal Science and Technology Commission Fund for improving the economy in the Yangtze River Delta region (12195811100).

Molten waste plastic pyrolysis in a vertical falling film reactor and the influence of temperature on the pyrolysis products

Zechen Jin, Dezhen Chen, Lijie Yin, Yuyan Hu, Huangqing Zhu, Liu Hong   

  1. Thermal and Environmental Engineering Institute, Tongji University, Shanghai 200092, China
  • Received:2017-03-29 Revised:2017-08-02 Online:2018-02-28 Published:2018-03-16
  • Contact: Lijie Yin
  • Supported by:

    Supported by the National Natural Science Foundation of China (51503154), Major Projects of China Water Pollution Control and Treatment Science and Technology (2017ZX07202005), and the Shanghai Municipal Science and Technology Commission Fund for improving the economy in the Yangtze River Delta region (12195811100).

摘要: Molten plastics are characterised with high viscosity and low thermal conductivity. Applying falling film pyrolysis reactor to deal with waste plastics can not only improve heat transfer efficiency, but also solve the flow problem. In this work, the pyrolysis process of molten polypropylene (PP) in a vertical falling film reactor is experimentally studied, and the influence of heating temperature on pyrolysis products is discussed. It has been found that with the temperature increases from 550℃ to 625℃, the yield of pyrolysis oil decreases from 74.4 wt% (±2.2 wt%) to 53.5 wt% (±1.3 wt%). The major compositions of the pyrolysis oil are C9, C12 and C18, and β-scission reactions are predominant. The content of the light fraction C6-C12 of pyrolysis oil is 69.7 wt%. Compared with other pyrolysis reactors, the yield of oil from vertical falling film pyrolysis reactor is slightly higher than that from tubular reactor, equal to that from rotary kiln reactor, and slightly lower than that in medium fluidised-bed reactor.

关键词: Pyrolysis, Reactor, Molten plastic, Pyrolysis oil, Fractional condensation

Abstract: Molten plastics are characterised with high viscosity and low thermal conductivity. Applying falling film pyrolysis reactor to deal with waste plastics can not only improve heat transfer efficiency, but also solve the flow problem. In this work, the pyrolysis process of molten polypropylene (PP) in a vertical falling film reactor is experimentally studied, and the influence of heating temperature on pyrolysis products is discussed. It has been found that with the temperature increases from 550℃ to 625℃, the yield of pyrolysis oil decreases from 74.4 wt% (±2.2 wt%) to 53.5 wt% (±1.3 wt%). The major compositions of the pyrolysis oil are C9, C12 and C18, and β-scission reactions are predominant. The content of the light fraction C6-C12 of pyrolysis oil is 69.7 wt%. Compared with other pyrolysis reactors, the yield of oil from vertical falling film pyrolysis reactor is slightly higher than that from tubular reactor, equal to that from rotary kiln reactor, and slightly lower than that in medium fluidised-bed reactor.

Key words: Pyrolysis, Reactor, Molten plastic, Pyrolysis oil, Fractional condensation