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Rubber pyrolysis: Kinetic modeling and vulcanization effects

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Listed:
  • Liu, Sheng
  • Yu, Jie
  • Bikane, Kagiso
  • Chen, Tao
  • Ma, Chuan
  • Wang, Ben
  • Sun, Lushi

Abstract

Kinetic studies and the effect of the vulcanization process on the pyrolysis of natural rubber (NR), butadiene rubber (BR) and styrene-butadiene rubber (SBR) were investigated in this work. A comprehensive kinetic study using a model-based method, a model-free method and the distribution activation energy model (DAEM) was applied and a comparison between the different models was drawn. The DAEM showed a better fitting of the experimental results than the model-based method. The activation energy distribution of the DAEM verified by the model-free method indicated that the main decomposition of rubbers followed a chain reaction mechanism. Pyrolysis of raw rubbers and their corresponding vulcanized rubbers were conducted in a fixed-bed reactor. The sulfur content and product yields were quantified. Pyrolysis oils were characterized and compared. The oil yields reached a maximum at 430 °C for NR (90.82%), 470 °C for both BR (90.61%) and SBR (92.80%). Pyrolytic oils of raw rubbers were mainly composed of their corresponding monomer or dimer, trimer compounds. However, the results of vulcanized rubbers pyrolysis were significantly different. Sulfur in the vulcanized rubbers was released at low temperatures due to the lower bond energy. Higher temperatures led to the conversion of sulfur-containing oils to gaseous compounds. Vulcanization promoted the decomposition of rubbers at low temperatures but had an insignificant influence on pyrolysis products distribution at high temperature. Pyrolysis oils of vulcanized rubbers were more complex, constituting various aromatic hydrocarbons and thiophenes.

Suggested Citation

  • Liu, Sheng & Yu, Jie & Bikane, Kagiso & Chen, Tao & Ma, Chuan & Wang, Ben & Sun, Lushi, 2018. "Rubber pyrolysis: Kinetic modeling and vulcanization effects," Energy, Elsevier, vol. 155(C), pages 215-225.
    • Handle: RePEc:eee:energy:v:155:y:2018:i:c:p:215-225
    DOI: 10.1016/j.energy.2018.04.146
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    References listed on IDEAS

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    1. Martínez, Juan Daniel & Puy, Neus & Murillo, Ramón & García, Tomás & Navarro, María Victoria & Mastral, Ana Maria, 2013. "Waste tyre pyrolysis – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 23(C), pages 179-213.
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    2. Kim, Jung-Hun & Oh, Jeong-Ik & Lee, Jechan & Kwon, Eilhann E., 2019. "Valorization of sewage sludge via a pyrolytic platform using carbon dioxide as a reactive gas medium," Energy, Elsevier, vol. 179(C), pages 163-172.
    3. Sergio Suárez & Jose Guillermo Rosas & Marta Elena Sánchez & Roberto López & Natalia Gómez & Jorge Cara-Jiménez, 2019. "Parametrization of a Modified Friedman Kinetic Method to Assess Vine Wood Pyrolysis Using Thermogravimetric Analysis," Energies, MDPI, vol. 12(13), pages 1-14, July.
    4. Navarro, M.V. & López, J.M. & Veses, A. & Callén, M.S. & García, T., 2018. "Kinetic study for the co-pyrolysis of lignocellulosic biomass and plastics using the distributed activation energy model," Energy, Elsevier, vol. 165(PA), pages 731-742.

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