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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. - PowerPoint PPT Presentation
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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
10th Conference on Gas-Liquid and Gas-Liquid-Solid Reactor Engineering Braga, Portugal June, 26-29, 2011
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles
Introduction
Gas-liquid absorbers• Importance of interfacial phenomena• Classical modelling approaches: two-films,
penetration, surface renewal…• Well validated by numerous experimental works … at
the reactor scale !• Few works validating at the diffusion layer scale
Development of experimental tool and procedure enabling the study of gas-liquid absorption coupled with reaction at the interface scale
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 2
Experimental setup
Gas-liquid absorption performed in a Hele-Shaw cell and observed using a Mach-Zehnder interferometer
Test case: CO2 absorption in NaHCO3/Na2CO3 solution
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 3
coupled with chemical reactions in the liquid phase
Experimental setup
Mach-Zehnder interferometer
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 4
Experimental setup
Interferograms processing (see Chem. Eng. Sc. 66, pp.3400)• Refractive index variations field• Horizontal averaging profiles
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 5
n
Mathematical modelling
Schematic view of the gas-liquid absorption
Page 6
Interface
Gaseous phase
NaHCO3/Na2CO3 aqueous solution
x=0 Gas - liquidequilibrium
Diffusion
Chemical reactions
XDepth in the liquid phase
CO2 + CO3= + H2O ⇄ 2 HCO3-
Mathematical modelling
Mass transfer coupled with chemical reaction
Physico-chemical parameters literature correlations
Numerical solving concentration profiles
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 7
with
Procedure overview
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 8
Experiments Mass transfer model
Refractive index variations profiles
Species concentration variations profiles
How to compare ?
They have to be converted into a comparable variable Density variationsCalibration to find correlations
Procedure overview
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 9
Experiments Mass transfer model
Refractive index variations profiles
Species concentration variations profiles
Calibration(refractometry)
Experimental density variations
profiles
Simulated density variations profiles
Procedure overview
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 10
Experiments Mass transfer model
Refractive index variations profiles
Species concentration variations profiles
Calibration(refractometry)
Experimental density variations
profiles
Simulated density variations profiles
Comparison
They match ?
Experiments – model comparison
Experiments compared with simulated profiles• Simulated profiles computed with physico-chemical
parameters estimated by literature correlations
• No match some parameters are not well estimated, especially parameters towards which the model is very sensitive
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 11
Procedure overview
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 12
Experiments Mass transfer model
Refractive index variations profiles
Species concentration variations profiles
Calibration(refractometry)
Experimental density variations
profiles
Simulated density variations profiles
Comparison
They match ? Physico-chemical parameter fitting
Procedure overview
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 13
Experiments Mass transfer model
Refractive index variations profiles
Species concentration variations profiles
Calibration(refractometry)
Experimental density variations
profiles
Simulated density variations profiles
Comparison
They match ? Physico-chemical parameter fitting
Procedure overview
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 14
Experiments Mass transfer model
Refractive index variations profiles
Species concentration variations profiles
Calibration(refractometry)
Experimental density variations
profiles
Simulated density variations profiles
Comparison
They match Physico-chemical parameter fitted
Experiments – model comparison
Parameters fitted least-square fitting
Parameters :• Correlations OK for h, k11, K2• New values for and ,corrections for
and Matched results
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 15
Conclusions
Interferometry and procedure OK for the study of gas-liquid mass absorption coupled with reactions at interface scale
Results comparable to mass transfer model provided that some physico-chemical parameters are well estimated
Perspectives Study of other systems: CO2 in amines (scrubbing)
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 16
Thanks for your kind attention.
Experimental setup
Gas-liquid absorption performed in a Hele-Shaw cell and observed using a Mach-Zehnder interferometer
Test case: CO2 absorption in NaHCO3/Na2CO3 solution
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 18
coupled with chemical reactions in the liquid phase
Experimental setup
Mach-Zehnder interferometer
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 19
Calibration
Link between refractive index and density• Proposed correlation:
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 20
,
↳
Calibration
Link between species concentrations and density• Proposed correlation:
Transfers, Interfaces and ProcessesApplied Science Faculty, Université Libre de Bruxelles Page 21
↳↳