Recovery of high-valued products from styrene-based polymers through coprocessing: Experiments and mechanistic modeling

Oh Sang Woo, Linda J. Broadbelt*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

The recent emergence of pyrolysis as a viable resource recovery strategy has focused attention on understanding the complex chemistry underlying the decomposition processes. In this work, a quantitative link between measurable experimental changes and kinetics analysis was established to explain the behavior of styrene-based polymers alone and in binary mixtures during pyrolysis. Experiments with low molecular weight polystyrene and poly(α-methylstyrene) were carried out which showed that a higher selectivity to monomer was obtained for poly(α-methylstyrene) than for polystyrene. The binary mixture experiments revealed that the reactivity of polystyrene was enhanced in the presence of poly(α-methylstyrene), and the selectivity to styrene monomer was increased. Overall, the experimental results suggest that coprocessing is a viable polymer resource recovery strategy when the addition of an appropriate co-reactant is used to tailor the product distribution. Furthermore, novel polymer structures may be designed to promote degradation to high-valued products. The experimental results were interpreted using a detailed mechanistic model which described the reactions of α-methylstyrene and styrene trimers and was generated using software for automated model construction to describe 901 species using over 4000 reactions. By exploiting the capability to label the model reactants, a quantitative link between polymers and their mimics was established and probed the impact of the kinetic coupling between different polymers.

Original languageEnglish (US)
Pages (from-to)121-140
Number of pages20
JournalCatalysis Today
Volume40
Issue number1
DOIs
StatePublished - Feb 2 1998

Keywords

  • Kinetic coupling
  • Mechanistic modeling
  • Polymer resource recovery
  • Polystyrene degradation

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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