(417g) Modeling of Diffusion Resistance of CO2 Adsorption on Poly(ethyleneimine) Impregnated Hollow Fiber Adsorbents

In the recent years, carbon di-oxide capture and separation from flue gas has become an active area of research of increasing importance, because of the influence of greenhouse gases like CO2 on global climate change. A significant amount of research is being carried out in different areas on post combustion CO2 capture including liquid amine scrubbing, absorption into ionic liquids, chemical looping combustion and adsorption on solid adsorbents [1]. Among the different technologies, adsorption on solid adsorbents stands out as a promising approach due to the potential of handling higher throughput and lower energy cost for regeneration compared to current liquid amine scrubbing technology [1]. In [2], Lively et al have compared the energy penalties of different technologies and showed that the fiber adsorbents loaded with zeolite MFI with heat integration is very promising in terms of energetics. As zeolite, which was used as proof of concept in [2], is not well suited for direct capture of CO2 from flue gas, later related studies had been performed in supported amine sorbents. Fan et al [3] in a related work, have evaluated the feasibility of CO2 adsorption on hollow fibers with poly(ethyleneimine) (PEI) impregnated amine sorbent, which is better amenable to CO2 capture from wet flue gas.
A rigorous evaluation of the technology feasibility, heat integration and process scalability requires a detailed mathematical modeling of the process and in particular the mass transfer resistance. As in most adsorption process, the mass transfer kinetics is critical to achieving a better heat integration and high purity and recovery of the product [4]. In this paper, we develop
a detailed mathematical model of the diffusion resistance of CO2 adsorption on PEI impregnated hollow fiber sorbents [3] and rigorously validate the model under different hollow fiber
membrane module configurations varying the flue gas flow rate, number of fibers, length of the fiber and support silica sorbent particle size.
References
[1] Yang, H., Xu, Z., Fan, M., Gupta, R., Slimane, R.B., Bland, A.E., and Wright, I., â??Progress in carbon dioxide separation and capture: A reviewâ??, Journal of Environmental Sciences, 2008, vol.20, pp-14-27.
[2] Lively, R.P., Chance, R.R., and Koros, W.J., â??Enabling low-cost CO2 capture via heat
integrationâ??, Ind.Eng.Chem.Res, 2010, vol. 49, pp.7550-7562.
[3] Fan, Y., Lively, R.P., Labreche, Y., Rezeai, F., Koros, W.J., and Jones, C.W., â??Evaluation of
CO2 adsorption dynamics of polymer/silica supported poly(ethylenimine) hollow fiber sorbents
in rapid temperature swing adsorptionâ??, Int. J. Greenhouse Gas Control, 2014, vol. 21, pp-61-71. [4] Ruthven, D.M., 1984. Principles of Adsorption and Adsorption Processes. Wiley, New York