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10 th Conference on Gas-Liquid and Gas-Liquid-Solid Reactor Engineering Braga, Portugal

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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10 th Conference on Gas-Liquid and Gas-Liquid-Solid Reactor Engineering Braga, Portugal

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  1. 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

  2. Introduction 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

  3. Experimental 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

  4. Experimental setup Transfers, Interfaces and Processes Applied Science Faculty, Université Libre de Bruxelles Mach-Zehnderinterferometer

  5. Experimental 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

  6. Mathematical 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

  7. Mathematical modelling with Transfers, Interfaces and Processes Applied Science Faculty, Université Libre de Bruxelles • Mass transfercoupledwithchemicalreaction • Physico-chemical parameters  literaturecorrelations • Numericalsolving  concentration profiles

  8. Procedureoverview 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

  9. Procedureoverview 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

  10. Procedureoverview 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

  11. Experiments – 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

  12. Procedureoverview 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

  13. Procedureoverview 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

  14. Procedureoverview 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

  15. Experiments – 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

  16. Conclusions 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)

  17. Thanks for your kind attention.

  18. Experimental 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

  19. Experimental setup Transfers, Interfaces and Processes Applied Science Faculty, Université Libre de Bruxelles Mach-Zehnderinterferometer

  20. Calibration , ↳ Transfers, Interfaces and Processes Applied Science Faculty, Université Libre de Bruxelles • Link betweenrefractive index and density • Proposedcorrelation:

  21. Calibration ↳ ↳ Transfers, Interfaces and Processes Applied Science Faculty, Université Libre de Bruxelles • Link betweenspecies concentrations and density • Proposedcorrelation:

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