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amine solution which is the stripped with water vapor in order to regenerate the MEA. The saturated water vapor can then be condensed leaving pure CO2 which can then be pressurized and sequestered (Rochelle). However, the operating cost is significantly higher in the amine absorption to regenerate the solvent. The amine absorption process takes out a portion of the process steam of the power plant reducing the overall capacity of the power plant. The energy penalty of the cryogenic distillation is prohibitively high. The average energy cost for CO2 capture is between 64.5 and 89.3 kJ/mol of CO2 removed. This process is predicted to become more efficient with a goal of 34.9 kJ/mol of CO2 removed (Rochelle). The membrane process suffers some serious drawbacks such as low flux, degradation, fouling, capital cost and stability at the extreme process conditions. An article published by the International Energy Agency (IEA) in 1994, focused the use of adsorption technologies for CO2 capture from flue gases on the basis of 500 MW power plant (International Energy Agency). Both pressure swing adsorption (PSA) and temperature swing adsorption (TSA) were evaluated used a commercial adsorbent 13X zeolite. At that time the study clouded that both PSA and TSA were too energy intensive and not feasible for CO2 capture from power plants. In 2003 another report by IEA reiterated the same results (Internal Energy Agency). However Webley and co-workers questioned findings of both report in one of their work (Chaffee, Knowles and Liang). This work reevaluated the PSA process by calculating the energy consumption by a PSA process for CO2 capture to be $67/tonne CO2 captured compared to $97/tonne CO2 captured as reported by IEA. This new energy consumption value of PSA compare much more favorably to the energy consumption by the amine absorption process at $60/tonne CO2. The cost of PSA can be brought down significantly by proper design of the PSA cycle. 2PDF Image | Development of a Pressure Swing Adsorption (PSA) Cycle for CO2 Capture
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