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Experimental study of gas-liquid mass transfer coupled with chemical reactions by digital holographic interferometry C. Wylock , S. Dehaeck, T. Cartage, P. Colinet, B. Haut. 10 th Conference on Gas-Liquid and Gas-Liquid-Solid Reactor Engineering Braga, Portugal June , 26-29, 2011.

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Experimental study of gas-liquid mass transfer coupled with chemical reactions by digital holographic interferometryC. Wylock, S. Dehaeck, T. Cartage, P. Colinet, B. Haut

10th Conference on Gas-Liquid and Gas-Liquid-Solid Reactor Engineering

Braga, Portugal

June, 26-29, 2011

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles


Introduction
Introduction chemical reactions by digital holographic

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

  • Gas-liquidabsorbers

    • Importance of interfacialphenomena

    • Classicalmodellingapproaches: two-films, penetration, surface renewal…

    • Wellvalidated by numerousexperimentalworks … at the reactorscale !

    • Few worksvalidatingat the diffusion layer scale

      Development of experimentaltool and procedureenabling the study of gas-liquid absorption coupledwithreactionat the interface scale


Experimental setup
Experimental chemical reactions by digital holographic setup

coupledwithchemicalreactions in the liquid phase

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

Gas-liquid absorption performed in a Hele-Shaw cell and observed using a Mach-Zehnder interferometer

Test case: CO2 absorption in NaHCO3/Na2CO3 solution


Experimental setup1
Experimental chemical reactions by digital holographic setup

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

Mach-Zehnderinterferometer


Experimental setup2
Experimental chemical reactions by digital holographic setup

n

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

  • Interferogramsprocessing(seeChem. Eng. Sc. 66, pp.3400)

    • Refractive index variations field

    • Horizontal averaging profiles


Mathematical modelling
Mathematical chemical reactions by digital holographic modelling

Gaseous phase

Gas - liquid

equilibrium

Interface

x=0

NaHCO3/Na2CO3aqueous solution

Diffusion

CO2 + CO3= + H2O ⇄ 2 HCO3-

Chemical reactions

X

Depth in the liquid phase

Schematic view of the gas-liquid absorption


Mathematical m odelling
Mathematical m chemical reactions by digital holographic odelling

with

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

  • Mass transfercoupledwithchemicalreaction

  • Physico-chemical

    parameters

     literaturecorrelations

  • Numericalsolving

     concentration profiles


Procedure overview
Procedure chemical reactions by digital holographic overview

Experiments

Mass transfer model

Refractive index variations profiles

Species concentration variations profiles

How to compare ?

  • They have to beconvertedinto a comparable variable

  •  Density variations

  • Calibration to findcorrelations

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles


Procedure overview1
Procedure chemical reactions by digital holographic overview

Experiments

Mass transfer model

Refractive index variations profiles

Species concentration variations profiles

Calibration

(refractometry)

Simulateddensity variations profiles

Experimentaldensity variations profiles

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles


Procedure overview2
Procedure chemical reactions by digital holographic overview

Experiments

Mass transfer model

Refractive index variations profiles

Species concentration variations profiles

Calibration

(refractometry)

Simulateddensity variations profiles

Experimentaldensity variations profiles

Comparison

They match ?

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles


Experiments model comparison
Experiments chemical reactions by digital holographic – model comparison

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

  • Experimentscomparedwithsimulated profiles

    • Simulated profiles computedwith physico-chemicalparametersestimated by literaturecorrelations

    • No match  someparameters are not wellestimated, especiallyparameterstowardswhich the model isvery sensitive


Procedure overview3
Procedure chemical reactions by digital holographic overview

Experiments

Mass transfer model

Refractive index variations profiles

Species concentration variations profiles

Calibration

(refractometry)

Simulateddensity variations profiles

Experimentaldensity variations profiles

Comparison

They match ?

Physico-chemicalparameterfitting

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles


Procedure overview4
Procedure chemical reactions by digital holographic overview

Experiments

Mass transfer model

Refractive index variations profiles

Species concentration variations profiles

Calibration

(refractometry)

Simulateddensity variations profiles

Experimentaldensity variations profiles

Comparison

They match ?

Physico-chemicalparameterfitting

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles


Procedure overview5
Procedure chemical reactions by digital holographic overview

Experiments

Mass transfer model

Refractive index variations profiles

Species concentration variations profiles

Calibration

(refractometry)

Simulateddensity variations profiles

Experimentaldensity variations profiles

Comparison

They match

Physico-chemicalparameterfitted

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles


Experiments model comparison1
Experiments chemical reactions by digital holographic – model comparison

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

  • Parametersfitted least-square fitting

  • Parameters :

    • Correlations OK for h, k11, K2

    • New values for and ,corrections for and

  • Matchedresults


Conclusions
Conclusions chemical reactions by digital holographic

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

  • Interferometry and procedure OK for the study of gas-liquid mass absorption coupledwithreactionsat interface scale

  • Results comparable to mass transfer model providedthatsome physico-chemicalparameters are wellestimated

  • Perspectives

    • Study of othersystems: CO2 in amines (scrubbing)


Thanks for your kind attention

Thanks for your kind attention. chemical reactions by digital holographic


Experimental setup3
Experimental chemical reactions by digital holographic setup

coupledwithchemicalreactions in the liquid phase

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

Gas-liquid absorption performed in a Hele-Shaw cell and observed using a Mach-Zehnder interferometer

Test case: CO2 absorption in NaHCO3/Na2CO3 solution


Experimental setup4
Experimental chemical reactions by digital holographic setup

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

Mach-Zehnderinterferometer


Calibration
Calibration chemical reactions by digital holographic

,

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

  • Link betweenrefractive index and density

    • Proposedcorrelation:


Calibration1
Calibration chemical reactions by digital holographic

Transfers, Interfaces and Processes

Applied Science Faculty, Université Libre de Bruxelles

  • Link betweenspecies concentrations and density

    • Proposedcorrelation:


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