Multiple steady states detection in a packed-bed reactive distillation column using bifurcation analysis

Naveed Ramzan, Muhammad Faheem, Rafiqul Gani, Werner Witt

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A packed reactive distillation column producing ethyl tert-butyl ether from tert-butyl alcohol and ethanol was simulated for detection of multiple steady states using Aspen Plus®. A rate-based approach was used to make the simulation model more realistic. A base-case was first developed and fine-tuned to fit experimental data. Sensitivity analyses were then performed for reboiler duty and distillate molar flow as continuation parameters to trace the respective bifurcation curves in the region of multiplicity. The results show output multiplicity at three distinct steady states at high reboiler duties. Input multiplicities were detected at high reflux ratios. Temperature and composition profiles of the solution branches were analyzed to identify the stable and desirable steady state. The optimum operating point was determined to be at a reboiler duty of 0.38 kW and a reflux ratio of 5–7. These results closely match the experimental results.
Original languageEnglish
JournalComputers & Chemical Engineering
Volume34
Issue number4
Pages (from-to)460-466
ISSN0098-1354
DOIs
Publication statusPublished - 2010

Cite this

Ramzan, Naveed ; Faheem, Muhammad ; Gani, Rafiqul ; Witt, Werner. / Multiple steady states detection in a packed-bed reactive distillation column using bifurcation analysis. In: Computers & Chemical Engineering. 2010 ; Vol. 34, No. 4. pp. 460-466.
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abstract = "A packed reactive distillation column producing ethyl tert-butyl ether from tert-butyl alcohol and ethanol was simulated for detection of multiple steady states using Aspen Plus{\circledR}. A rate-based approach was used to make the simulation model more realistic. A base-case was first developed and fine-tuned to fit experimental data. Sensitivity analyses were then performed for reboiler duty and distillate molar flow as continuation parameters to trace the respective bifurcation curves in the region of multiplicity. The results show output multiplicity at three distinct steady states at high reboiler duties. Input multiplicities were detected at high reflux ratios. Temperature and composition profiles of the solution branches were analyzed to identify the stable and desirable steady state. The optimum operating point was determined to be at a reboiler duty of 0.38 kW and a reflux ratio of 5–7. These results closely match the experimental results.",
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Multiple steady states detection in a packed-bed reactive distillation column using bifurcation analysis. / Ramzan, Naveed; Faheem, Muhammad; Gani, Rafiqul; Witt, Werner.

In: Computers & Chemical Engineering, Vol. 34, No. 4, 2010, p. 460-466.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Multiple steady states detection in a packed-bed reactive distillation column using bifurcation analysis

AU - Ramzan, Naveed

AU - Faheem, Muhammad

AU - Gani, Rafiqul

AU - Witt, Werner

PY - 2010

Y1 - 2010

N2 - A packed reactive distillation column producing ethyl tert-butyl ether from tert-butyl alcohol and ethanol was simulated for detection of multiple steady states using Aspen Plus®. A rate-based approach was used to make the simulation model more realistic. A base-case was first developed and fine-tuned to fit experimental data. Sensitivity analyses were then performed for reboiler duty and distillate molar flow as continuation parameters to trace the respective bifurcation curves in the region of multiplicity. The results show output multiplicity at three distinct steady states at high reboiler duties. Input multiplicities were detected at high reflux ratios. Temperature and composition profiles of the solution branches were analyzed to identify the stable and desirable steady state. The optimum operating point was determined to be at a reboiler duty of 0.38 kW and a reflux ratio of 5–7. These results closely match the experimental results.

AB - A packed reactive distillation column producing ethyl tert-butyl ether from tert-butyl alcohol and ethanol was simulated for detection of multiple steady states using Aspen Plus®. A rate-based approach was used to make the simulation model more realistic. A base-case was first developed and fine-tuned to fit experimental data. Sensitivity analyses were then performed for reboiler duty and distillate molar flow as continuation parameters to trace the respective bifurcation curves in the region of multiplicity. The results show output multiplicity at three distinct steady states at high reboiler duties. Input multiplicities were detected at high reflux ratios. Temperature and composition profiles of the solution branches were analyzed to identify the stable and desirable steady state. The optimum operating point was determined to be at a reboiler duty of 0.38 kW and a reflux ratio of 5–7. These results closely match the experimental results.

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DO - 10.1016/j.compchemeng.2009.09.001

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