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Modeling and Optimization of Grade Changes for Multistage Polyethylene Reactors

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Author

Summary, in English

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 JModelica.org, 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.

Publishing year

2011

Language

English

Document type

Conference paper

Topic

  • Control Engineering
  • Chemical Engineering

Keywords

  • optimization
  • reactor control
  • polymerization
  • chemical industry

Conference name

18th IFAC World Congress, 2011

Conference date

2011-08-28 - 2011-09-02

Conference place

Milan, Italy

Status

Published

Project

  • PICLU

Research group

  • LCCC