Hydrogen response in liquid propylene polymerization: Towards a generalized model

M.Q.K. Al Haj Ali, Bernardus H.L. Betlem, B. Roffel, G. Weickert

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27 Citations (Scopus)


Liquid propylene batch experiments in the absence of a gas phase have been carried out using a highly-active MgCl2/TiCl4/phthalate/silane/AlR3 catalyst at varying temperatures (60-80°C) and molar hydrogen-monomer ratios of 0-10 mmol/mol. With increasing hydrogen concentration the: 1. polymerization rate increases rapidly, reaching a constant value at concentrations above 1.4 mmol/mol; 2. pseudo-first-order catalyst deactivation constant increases; 3. molecular weight decreases; 4. polydispersity decreases slightly; but average molecular weight and polydispersity increase with increasing temperature. Polymerization rate, deactivation constant, and average molecular weight can be modeled based on a consistent dormant site mechanism assuming an (averaged) quasi-single-site model.
Original languageUndefined
Pages (from-to)1866-1876
JournalAIChE journal
Issue number5
Publication statusPublished - 2006


  • Liquid phase propylene polymerization
  • polymerization kinetics
  • catalyst decay
  • hydrogen response
  • dormant-site theory
  • METIS-235405
  • IR-67301
  • Molecular weight distribution

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