Mathematical Modeling of Carbon Dioxide Removal from the CO2/CH4 Gas Mixture Using Amines and Blend of Amines in Polypropylene: A Comparison between Hollow Fiber Membrane Contactor and Other Membranes

Document Type : Research Paper


Shiraz university of technology


In this work, a mathematical model is established to describe the removal of CO2 from gaseous mixtures including CH4 and CO2 in a polypropylene hollow fiber membrane contactor in the presence of conventional absorbents such as monoethanolamine (MEA), methyldiethanolamine (MDEA), and a blend of them. Modeling was performed in axial and radial directions under the fully-wet condition for countercurrent gas-liquid flow arrangement. Both of axial and radial diffusions have been considered in three segments, including shell, membrane, and tube. To evaluate the model, the results of this model were compared with the experimental data and the results of COMSOL software and the results were in agreement with the experimental data and COMSOL outputs. In addition, the effect of various parameters on the removal percentage of carbon dioxide from gas mixtures was studied. It was found out that the CO2 removal percentage is the best by using MEA solution as the absorbent. This modeling shows that the removal of CO2 increases by adding MEA into MDEA solution. In this study, the factors that influence the removal percentage of CO2 from gaseous mixture were investigated. The CO2 removal efficiency increased with an increase in the liquid flow rate, number of fibers, membrane length, porosity-to-tortuosity ratio, and solvent concentration. The results show that increasing gas flow rate reduces CO2 removal due to decreasing the contact time. Finally, the performance of this membrane was compared with other membranes such as polyvinyl difluoride (PVDF) and polytetrafluoroethylene (PTFE). The results show that the percentage of CO2 removal by the polypropylene HFM is higher than that of the PVDF and PTFE hollow fiber membranes in the presence of MEA as the absorbent.


Zhang J., Webley P. A. and Xiao P., “Effect of Process Parameters on Power Requirements of Vacuum Swing Adsorption Technology for CO2 Capture from Flue Gas,” Energy Conversion and Management, 2008, 49(2), 346-350.
Powell C. E. and Qiao G. G., “Polymeric CO2/N2 Gas Separation Membranes for the Capture of Carbon Dioxide from Power Plant Flue Gases,” J. Member Sci., 2006, 279, 1-10.
Kohl A. L. and Nielsen R., “Gas Purification,” Houston Texas: Gulf Publishing Company, 1997.
Wang R., Zhang H. Y., Feron P. H. M., and Liang D. T., “Influence of membrane wetting on CO2 capture in microporous hollow fiber membrane contactors,” Separation and Purification Technology, 2005, 46, 33-40.
Singh P. and Versteeg G. F., “Structure and Activity Relationships for CO2 Regeneration from Aqueous Amine-based Absorbents,” Process Safety and Environmental Protection, 2008, 86, 347–359.
Mavroudi M., Kaldis S. P., and Sakellaropoulos G. P., “A Study of Mass Transfer Resistance in Membrane Gas-liquid Contacting Process,” Journal of Membrane Science, 2006, 272, 103-115.
Wang R., Li D. F., Zhou C., Liu M., and et al., “Impact of DEA Solutions with and without CO2 Loading on Porous Polypropylene Membranes intended for Use as Contactors,” Journal of Membrane Science, 2004, 229, 147-157.
Lv Y. X., Yu X. H., Tu S. T., Yan, J.Y., and et al., “Wetting of Polypropylene Hollow Fiber Membrane Contactors,” Journal of Membrane Science, 2010, 362, 444-452.
Lv Y. X., Yu X. H., Tu S. T., Yan J. Y., and et al., “Experimental Studies on Simultaneous Removal of CO2 and SO2 in a Polypropylene Hollow Fiber Membrane Contactor,” International Conference on Applied Energy, ICAE 2011, Italy, 2011.
Qi Z. and Cussler E. L., “Microporous Hollow Fibers for Gas Absorption,” J. Member Sci., 1985, 23(3), 321-330.
Karoor S., and Sirkar K. K., “Gas Absorption Studies in Microporous Hollow Fiber Membrane Contactors,” J. Member Sci., 2001, 194(4), 57-64.
Dindore V. Y., Brilman D. W. F., and Versteeg G. F., “Modeling of Cross-flow Membrane Contactors: Mass Transfer with Chemical Reactions,” J. Member Sci., 2005, 255, 275-285.
Wang R., Li D., and Liang D., “Modeling of CO2 Capture by Three Typical Amine Solution in Hollow Fiber Membrane Contactors,” Chem. Eng. Proc., 2004, 43, 849-860.
Al-Marzougi M., El-Nass M., Marzouk S., Abdulkarimi M., and et al., “Modeling of CO2 absorption in membrane contactors,” Sep. Purification Technology, 2008, 59(1), 286-292.
Happel J., “Viscous Flow Relative to Arrays of Cylinders,” AIChE J., 1959, 5(1), 174-182.
Bird R. B., Stewart W. E., and Lightfoot E. N., “Transport Phenomena,” New York: Wiley, 1960.
Paul S., Ghoshal A. K., and Mandal B., “Removal of CO2 by single and Blended Aqueous Alkanol amine Solvents in Hollow-Fiber Membrane Contactor: Modeling and Simulation,” Ind. Eng. Chem. Res., 2007, 46, 2576-2585.
Al-Marzougi M., El-Nass M., Marzouk S., and Abdullatif N., “Modeling Chemical Absorption of CO2 in Membrane Contactors,” Sep. Purifi. Technol., 2008, 62, 499-515.
Versteeg G. F. and Van Swaalj W., “Solubility and Diffusivity of Acid Gases (Carbon Dioxide, nitrous Oxide) in Aqueous Alkanol Amine Solutions,” Journal of Chemical and Engineering Data, 1988, 33, 29-34.
Cussler E., “Diffusion: Mass Transfer in Fluid Systems, 1,” Cambridge University Press, Cambridge, Chapters, 1984, 1, 9-21.
Hagewiesche D. P., Ashour S. S., Al-Ghawas H. A., and Sandall O. C., “Absorption of Carbon Dioxide into Aqueous Blends of Monoethanolamine and N-methyldiethanolamine,” Chemical Engineering Science, 1995, 50, 1071-1079.