Validation of the Danckwerts-plot technique by simultaneous chemical absorption of CO2 and physical desorption of O2

A.H.G. Cents, F.T. de Bruijn, Derk Willem Frederik Brilman, Geert Versteeg

  • 12 Citations

Abstract

The Danckwerts-plot technique [Danckwerts et al., 1963. Chemical Engineering Science 18, 63–72] is used in chemical engineering to simultaneously obtain the mass transfer parameters, kL and a, from mass transfer experiments. This method requires variation of the reaction kinetics by adding different amounts of catalyst. Although the method is known for several decades, it was never verified that the variation of the amount of catalyst does not affect the hydrodynamics of the system under investigation. To study this, absorption of CO2 in a carbonate/bicarbonate buffer solution was performed simultaneously with desorption of oxygen from this solution, after verification that absorption and desorption are processes, taken place at identical rates, but in a different direction. It was shown that the addition of catalyst did not affect the desorption rate of oxygen. The obtained kLa for oxygen was, however, 64% higher compared to the kLa of carbon dioxide. This was probably due to a lower effective interfacial area, caused by the complete depletion of small bubbles containing CO2. Mass transfer experiments with oxygen, with a low gas phase conversion, are therefore to be preferred, as the measured mass transfer parameters are less affected by the gas phase RTD and the shape of the bubble size distribution.
Original languageUndefined
Pages (from-to)5809-5818
Number of pages9
JournalChemical engineering science
Volume60
Issue number21
DOIs
StatePublished - 2005

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Mass transfer
Oxygen
Desorption
Catalysts
Chemical engineering
Gases
Experiments
Reaction kinetics
Carbonates
Carbon dioxide
Hydrodynamics

Keywords

  • IR-76897
  • Mass transfer
  • Danckwerts-plot technique
  • Gas absorption
  • Interfacial area
  • METIS-226334

Cite this

Cents, A.H.G.; de Bruijn, F.T.; Brilman, Derk Willem Frederik; Versteeg, Geert / Validation of the Danckwerts-plot technique by simultaneous chemical absorption of CO2 and physical desorption of O2.

In: Chemical engineering science, Vol. 60, No. 21, 2005, p. 5809-5818.

Research output: Scientific - peer-reviewArticle

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title = "Validation of the Danckwerts-plot technique by simultaneous chemical absorption of CO2 and physical desorption of O2",
abstract = "The Danckwerts-plot technique [Danckwerts et al., 1963. Chemical Engineering Science 18, 63–72] is used in chemical engineering to simultaneously obtain the mass transfer parameters, kL and a, from mass transfer experiments. This method requires variation of the reaction kinetics by adding different amounts of catalyst. Although the method is known for several decades, it was never verified that the variation of the amount of catalyst does not affect the hydrodynamics of the system under investigation. To study this, absorption of CO2 in a carbonate/bicarbonate buffer solution was performed simultaneously with desorption of oxygen from this solution, after verification that absorption and desorption are processes, taken place at identical rates, but in a different direction. It was shown that the addition of catalyst did not affect the desorption rate of oxygen. The obtained kLa for oxygen was, however, 64% higher compared to the kLa of carbon dioxide. This was probably due to a lower effective interfacial area, caused by the complete depletion of small bubbles containing CO2. Mass transfer experiments with oxygen, with a low gas phase conversion, are therefore to be preferred, as the measured mass transfer parameters are less affected by the gas phase RTD and the shape of the bubble size distribution.",
keywords = "IR-76897, Mass transfer, Danckwerts-plot technique, Gas absorption, Interfacial area, METIS-226334",
author = "A.H.G. Cents and {de Bruijn}, F.T. and Brilman, {Derk Willem Frederik} and Geert Versteeg",
year = "2005",
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volume = "60",
pages = "5809--5818",
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Validation of the Danckwerts-plot technique by simultaneous chemical absorption of CO2 and physical desorption of O2. / Cents, A.H.G.; de Bruijn, F.T.; Brilman, Derk Willem Frederik; Versteeg, Geert.

In: Chemical engineering science, Vol. 60, No. 21, 2005, p. 5809-5818.

Research output: Scientific - peer-reviewArticle

TY - JOUR

T1 - Validation of the Danckwerts-plot technique by simultaneous chemical absorption of CO2 and physical desorption of O2

AU - Cents,A.H.G.

AU - de Bruijn,F.T.

AU - Brilman,Derk Willem Frederik

AU - Versteeg,Geert

PY - 2005

Y1 - 2005

N2 - The Danckwerts-plot technique [Danckwerts et al., 1963. Chemical Engineering Science 18, 63–72] is used in chemical engineering to simultaneously obtain the mass transfer parameters, kL and a, from mass transfer experiments. This method requires variation of the reaction kinetics by adding different amounts of catalyst. Although the method is known for several decades, it was never verified that the variation of the amount of catalyst does not affect the hydrodynamics of the system under investigation. To study this, absorption of CO2 in a carbonate/bicarbonate buffer solution was performed simultaneously with desorption of oxygen from this solution, after verification that absorption and desorption are processes, taken place at identical rates, but in a different direction. It was shown that the addition of catalyst did not affect the desorption rate of oxygen. The obtained kLa for oxygen was, however, 64% higher compared to the kLa of carbon dioxide. This was probably due to a lower effective interfacial area, caused by the complete depletion of small bubbles containing CO2. Mass transfer experiments with oxygen, with a low gas phase conversion, are therefore to be preferred, as the measured mass transfer parameters are less affected by the gas phase RTD and the shape of the bubble size distribution.

AB - The Danckwerts-plot technique [Danckwerts et al., 1963. Chemical Engineering Science 18, 63–72] is used in chemical engineering to simultaneously obtain the mass transfer parameters, kL and a, from mass transfer experiments. This method requires variation of the reaction kinetics by adding different amounts of catalyst. Although the method is known for several decades, it was never verified that the variation of the amount of catalyst does not affect the hydrodynamics of the system under investigation. To study this, absorption of CO2 in a carbonate/bicarbonate buffer solution was performed simultaneously with desorption of oxygen from this solution, after verification that absorption and desorption are processes, taken place at identical rates, but in a different direction. It was shown that the addition of catalyst did not affect the desorption rate of oxygen. The obtained kLa for oxygen was, however, 64% higher compared to the kLa of carbon dioxide. This was probably due to a lower effective interfacial area, caused by the complete depletion of small bubbles containing CO2. Mass transfer experiments with oxygen, with a low gas phase conversion, are therefore to be preferred, as the measured mass transfer parameters are less affected by the gas phase RTD and the shape of the bubble size distribution.

KW - IR-76897

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KW - Danckwerts-plot technique

KW - Gas absorption

KW - Interfacial area

KW - METIS-226334

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M3 - Article

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