Nonlinear approach to design of monolithic loop reactor for fischer-tropsch synthesis

Montree Lumluksanaphaiboon, Costin Sorin Bildea, Johan Grievink

Research output: Contribution to journalArticle

Abstract

The nonlinear behaviour of the monolithic loop reactor for Fischer-Tropsch synthesis is investigated. The model consists of non-stationary mass balances in gas, liquid and solid (catalyst) phases, together with energy balance. If the external heat-exchanger is small, the system exhibits multiple steady states and the moderte-conversion state is unstable. Due to occurrence of Hopf bifurcation, only part of the high- and low-conversion states are stable. State multiplicity disappears for a large heat exchanger. However, sustained oscillations occur around desired operating points. By calculating relevant bifurcation varieties, the reactor can be designed such that the reaction ignition/ extinction and the oscillatory behaviour are avoided, even when the design parameters are uncertain or the plant is subjected to disturbances. A control structure is proposed, as an alternative solution for achieving stable operation.

Original languageEnglish
Pages (from-to)769-774
Number of pages6
JournalComputer Aided Chemical Engineering
Volume20
Issue numberC
DOIs
Publication statusPublished - Dec 1 2005

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Keywords

  • Fischer-Tropsch
  • Hopf bifurcations
  • design
  • monolithic reactor
  • multiplicity

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Computer Science Applications

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