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1860 Pressure swing adsorption (PSA) is utilized to capture CO2 from the exit stream of water-gas-shift reactor at room temperature. The best operating conditions for the 2-bed 8-step PSA process at room temperature is shown in Figure 5. The results of best operating condition for the dual-bed 8-step process at room temperature are 99.98 % purity and 78.55 % recovery of H2 as top product, and 91.97 % purity and 97.8 % recovery of CO2 as bottom product as shown in Figure 5. Figure 5: Results of the two stages of the 2-bed 8-step PSA process at room temperature 4. Conclusion This study can obtain high purity of CO2 through second stage by 13X-Ca. The purified H2 through first stage by AC5-KS can be sent to gas turbine for generating electrical power or can be used for other energy source. It is assumed that the gas mixture from which water has been removed enters the PSA process. The optimal operating condition is obtained by varying the operating variables, such as feed pressure, bed length, etc. Furthermore, the first stage H2-PSA could achieve 99.98 % purity and 79 % recovery of H2 as the top product and the second stage CO2-PSA could obtain about 92 % purity and 98 % recovery of CO2 as the bottom product. By PSA process, the goal of energy generation and environmental protection could be achieved at the same time. Acknowledgement Reference Abu-Zahra M.R.M., Feron P.H.M., Jansens P.J., Goetheer E.L.V., 2009, New process concepts for CO2 post-combustion capture process integrated with co-production of hydrogen, International J. of Hydrogen Energy, 34, 3992-4004. Bell D.A., Towler B.F, Fan M., 2011, Coal gasification and its applications, Elsevier, London, UK. IPCC (Intergovernmental Panel on Climate Change), 2005, Carbon dioxide capture and storage, Cambridge University Press. Lopes F. V. S., Grande C. A., Ribeiro A. M., Oliveira E. L. G., Loureiro J. M., Rodrigues A. E., 2009, Enhancing capacity of activated carbons for hydrogen purification, Ind. Eng. Chem. Res., 48(8), 3978– 3990. Lopes F. V. S., Grande C. A., Ribeiro A. M., Vilar V. J. P., Loureiro J. M., Rodrigues A. E., 2010, Effect of Ion exchange on the adsorption of steam methane reforming off-gases on zeolite 13X, J. Chem. Eng. Data, 55(1), 184–195. Malek A., Farooq S., 1997, Kinetics of hydrocarbon adsorption on activated carbon and silica gel, AIChE J., 43(3),761–776. NETL (The United States Department of Energy, National Energy Technology Laboratory), 2009, Evaluation of Alternate Water Gas Shift Configurations for IGCC Systems, DOE/NETL-401/080509. Yang J., Han S., Cho C., Lee C.H., Lee H., 1995, Bulk separation of hydrogen mixtures by a one-column PSA process, Separations Technology, 5(4), 239-249. The authors wish to thank the financial support from National Science Council, Taiwan under project number NSC 102-3113-P-008 -007.PDF Image | Carbon Dioxide Capture and Hydrogen Purification PSA
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