Kinetic Study of Thermal De-Chlorination of PVC-Containing Waste

Abstract:

The presence of organic compounds on wastes, especially plastics, is considered an important source of energy. However, most of these plastics contain polyvinyl chloride (PVC), causing recycling problems when it is considered a thermal valorization process for its treatment [1], preventing the use of those residues on these processes, which main goal is the energy recovery [2,3]. A possible solution is to remove the chlorine from PVC containing waste through a pyrolysis process before being subjected to a thermal treatment, for energetic valorization. In this work, it was developed a kinetic model for the thermal decomposition of PVC, in view of its de-chlorination. DTA/TGA testing were performed at different temperatures (between the range of decomposition temperatures of the PVC molecule) indicated a first order reaction and an activation energy of 133800 J/mol, value very close to the one obtained in others works reported [4]. A factorial plan was carried out with different temperatures, performed in lab scale, in which best results were obtained at the temperature of 340 °C, proving the kinetic model obtained.

• Periodical: Materials Science Forum (Volumes 730-732)
• Pages: 611-616
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.730-732.611
• Online since: November 2012
• Authors: Alexandra Castro, Cândida Vilarinho, Delfim Soares, Fernando Castro
• Keywords: PVC-Containing Waste, Pyrolysis, Thermal Degradation

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