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Modeling and Optimization of Grade Changes for Multistage Polyethylene Reactors

  • Per-Ola Larsson
  • Johan Åkesson (Assistant Professor)
  • Staffan Haugwitz
  • Niklas Andersson
Publiceringsår: 2011
Språk: Engelska
Dokumenttyp: Konferensbidrag
Ytterligare information: Key=pol+11IFAC project=polygradechange


Grade changes in polyethylene reactors, i.e., changes of operating conditions, are performed on a regular basis to adapt to market demands. In this paper, a dynamic optimization procedure is presented built upon the Modelica language extended with Optimica constructs for formulation of optimization problems. A Modelica library for the Borstar R multistage
polyethylene reactors at Borealis AB, consisting of two slurry and one gas phase reactor, has been constructed. Using, a framework to translate dynamic optimization problems to NLP problems, optimal grade transitions between grades currently used at Borealis AB, can be calculated. Optimal inflows and grade key variables are shown.



  • Technology and Engineering
  • optimization
  • reactor control
  • polymerization
  • chemical industry


18th IFAC World Congress
Milano, Italy
  • LCCC

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