Dynamic Multi-Objective Optimization of Batch Chromatographic Separation Processes

Anders Holmqvist, Fredrik Magnusson, Bernt Nilsson

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

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Abstract

This contribution presents a novel offline dynamic multi-objective optimization framework for high-pressure liquid chromatographic (HPLC) processes in batch elution mode. The framework allows for optimization of general elution trajectories parametrized with piecewise constant control signals. It is based on a simultaneous method where both the control and state variables are fully discretized in the temporal domain, using orthogonal collocations on finite elements, and the state variables are discretized in the spatial domain, using a finite volume weighted essentially non-oscillatory (WENO) scheme. The resulting finite dimensional nonlinear program (NLP) is solved using a primal-dual interior point method and automatic differentiation techniques. The advantages of this open-loop optimal control methodology are highlighted through the solution of a challenging ternary complex mixture separation problem for a hydrophobic interaction chromatography (HIC) system. For a bi-objective optimization of the target component productivity and yield, subject to a purity constraint, the set of Pareto solutions generated with general elution trajectories showed considerable improvement in the productivity objective when compared to the Pareto set obtained using conventional linear elution trajectories.
Original languageEnglish
Title of host publicationComputer Aided Chemical Engineering
EditorsKrist V. Gernaey, Jakob K. Huusom, Rafiqul Gani
PublisherElsevier
Pages815-820
Number of pages6
Volume37
ISBN (Print)978-0-444-63429-0
DOIs
Publication statusPublished - 2015
Event12th International Symposium on Process Systems Engineering and 25th European Symposium on Computer Aided Process Engineering - Copenhagen, Denmark
Duration: 2015 May 312015 Jun 4

Publication series

Name
Volume37
ISSN (Print)1570-7946

Conference

Conference12th International Symposium on Process Systems Engineering and 25th European Symposium on Computer Aided Process Engineering
Country/TerritoryDenmark
CityCopenhagen
Period2015/05/312015/06/04

Subject classification (UKÄ)

  • Control Engineering
  • Chemical Engineering

Free keywords

  • Batch chromatography
  • Dynamic multi-objective optimization
  • Collocation

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