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1 Study of the gas-liquid CO 2 absorption in aqueous monoethanolamine solutions: development of a new experimental tool C. Wylock, S. Dehaeck, E. Boulay, P. Colinet and B. Haut CO 2 Summit:Technology and Opportunity Vail, USA June, 7 th, 2010 Applied Science Faculty, Université Libre de Bruxelles
2 CO 2 capture process by Cansolv Technologies Inc. Absorption in amine solutions regeneration by boiling Packed column Applied Science Faculty, Université Libre de Bruxelles Page 2
3 Best amine selection Target : Fast reactivity with CO 2 High absorption capacity Low energy (heating) regeneration cost High stability Screening of several amine mixtures Applied Science Faculty, Université Libre de Bruxelles Page 3
4 This work Propose a new experimental tool to determine the gas-liquid mass transfer coefficient Will (hopefully) contribute to: Amine selection Absorber design Applied on monoethanolamine (MEA) as a test case Applied Science Faculty, Université Libre de Bruxelles Page 4
5 Outline Description of the tool and procedure Experimental setup Overview of the procedure Mathematical modeling Calibration Mass transfer coefficient estimation Results and discussion Conclusion Applied Science Faculty, Université Libre de Bruxelles Page 5
6 Experimental setup The absorption of a pure gaseous CO 2 in an aqueous MEA solution is realized in a Hele-Shaw cell Applied Science Faculty, Université Libre de Bruxelles Page 6
7 Experimental setup The absorption of a pure gaseous CO 2 in an aqueous MEA solution is realized in a Hele-Shaw cell CO 2 Water-MEA Applied Science Faculty, Université Libre de Bruxelles Page 7
8 Experimental setup The absorption of a pure gaseous CO 2 in an aqueous MEA solution is realized in a Hele-Shaw cell CO 2 Water-MEA Refractive index variations in the liquid phase induced by this absorption are visualized using a Mach- Zehnder interferometer Applied Science Faculty, Université Libre de Bruxelles Page 8
9 Experimental setup Mach-Zehnder interferometer (MZI) block-diagram Applied Science Faculty, Université Libre de Bruxelles Page 9
10 Experimental setup Refractive index variations are computed from the interferogram variations thanks to an image processing program (Dehaeck et al., 2008) Applied Science Faculty, Université Libre de Bruxelles Page 10
11 Experimental setup Refractive index variations are computed from the interferogram variations thanks to an image processing program (Dehaeck et al., 2008) Time evolution of the refractive index profiles Modeling of the phenomena by a 1-D model Applied Science Faculty, Université Libre de Bruxelles Page 11
12 Overview of the procedure Gas-liquid absorption experiments 1-D mass transfer model (with physico-chemical parameters) MZI Experimental profiles of refractive index variation n exp Parameter fitting Equation solver Simulated profiles of concentration variation C sim COMPARISON Simulated profiles of refractive index variation n sim Calibration by refractometry correlation n = f ( C ) Applied Science Faculty, Université Libre de Bruxelles Page 12
13 Overview of the procedure Gas-liquid absorption experiments 1-D mass transfer model (with physico-chemical parameters) MZI Experimental profiles of refractive index variation n exp Parameter fitting Equation solver Simulated profiles of concentration variation C sim COMPARISON Simulated profiles of refractive index variation n sim Calibration by refractometry correlation n = f ( C ) Applied Science Faculty, Université Libre de Bruxelles Page 13
14 Mathematical modeling Schematic view of the gas-liquid absorption (MEA = RNH 2 with R = CH 2 CH 2 OH) x=0 Gas - liquid equilibrium Diffusion Gaseous phase Interface MEA aqueous solution (close to the interface) Chemical reactions X Depth in the liquid phase Page 14
15 Mathematical modeling Mass transfer equations in the liquid phase + appropriate boundary and initial conditions with Applied Science Faculty, Université Libre de Bruxelles Page 15
16 Mathematical modeling Equations solved using the COMSOL Multiphysics software time evolution of the concentration profiles Converted into refractive index profiles by calibration Applied Science Faculty, Université Libre de Bruxelles Page 16
17 Overview of the procedure Gas-liquid absorption experiments 1-D mass transfer model (with physico-chemical parameters) MZI Experimental profiles of refractive index variation n exp Parameter fitting Equation solver Simulated profiles of concentration variation C sim COMPARISON Simulated profiles of refractive index variation n sim Calibration by refractometry correlation n = f ( C ) Applied Science Faculty, Université Libre de Bruxelles Page 17
18 Calibration Calibration curves identified by refractometry n measured for several concentrations in MEA n measured for several concentrations in MEA and several dissolved CO 2 amount Applied Science Faculty, Université Libre de Bruxelles Page 18
19 Overview of the procedure Gas-liquid absorption experiments 1-D mass transfer model (with physico-chemical parameters) MZI Experimental profiles of refractive index variation n exp Parameter fitting Equation solver Simulated profiles of concentration variation C sim COMPARISON Simulated profiles of refractive index variation n sim Calibration by refractometry correlation n = f ( C ) Applied Science Faculty, Université Libre de Bruxelles Page 19
20 Parameter fitting Method Let and be the experimental and the simulated (with a parameter set P) refractive index variation at time t j and position x i, respectively Estimation of P that minimizes using the fminsearch routine of COMSOL Script Comparison Simulated profiles Parameter fitting Experimental profiles Applied Science Faculty, Université Libre de Bruxelles Page 20
21 Results and discussion Comparison of experiments (dot) and simulated (dash) A good comparison is observed when fitted parameters are used Fitting OK Physico-chemical parameter estimation Parameters Fitted value Literature value D RNH2 [m 2 /s] k 1 [m 3 /mol s] h CO2 [mol/m 3 Pa] A good agreement is obtained A. Aboudheir et al., CES, 58, 5195 W. van Swaaij, et al, CES, 39, 207 W. van Swaaij et al., JCE Data, 33, 29 Applied Science Faculty, Université Libre de Bruxelles Page 21
22 Conclusion Simulated refractive index variation profiles (using fitted parameter values): agree pretty well with experimental profiles Fitted parameter values: in agreement with values estimated using literature correlations Procedure seems operational for the CO 2 absorption in MEA aqueous solutions Will be applied to study gas-liquid CO 2 absorption in solvents provided by Cansolv Applied Science Faculty, Université Libre de Bruxelles Page 22
23 Thanks for your kind attention.
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