Chaotic behavior of industrial fluidized-bed reactors for polyethylene production

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Recent theories of bifurcation and chaos are used to analyze the dynamic behavior of the UNIPOL process for the production of polyethylene in the gas phase using the Ziegler-Natta catalyst. Dynamic behavior covers wide regions of the design and operating parameters domain of this industrially important unit. A conventional proportional-integral (PI) controller was implemented to stabilize the desired operating point on the unstable steady-state branch. The presence of the PI controller stabilized the desired unstable steady-state regions to a certain range of catalyst injection rate, by contrast, it is found out that the controlled process can go through a period doubling sequence leading to chaotic strange attractors. The practical implications of this analysis can be very serious, since chaos is shown to exist right near the desired operating point where high polyethylene production rates can be achieved.

Original languageEnglish
Pages (from-to)297-303
Number of pages7
JournalChemical Engineering and Technology
Issue number3
Publication statusPublished - Mar 2001
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


Dive into the research topics of 'Chaotic behavior of industrial fluidized-bed reactors for polyethylene production'. Together they form a unique fingerprint.

Cite this