New Pressure Swing Adsorption Cycles for Carbon Dioxide Sequestration

Author： Reynolds Steven Ebner Armin Ritter James

ISSN： 0929-5607

Source： Adsorption, Vol.11, Iss.1, 2005-07, pp. : 531-536

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Abstract

A rigorous pressure swing adsorption (PSA) process simulator was used to study a new, high temperature PSA cycle, based on the use of a K-promoted HTlc adsorbent and a simple, 4-step, Skarstrom-type, vacuum swing cycle designed to process a typical stack gas effluent at 575 K containing (in vol%) 15% CO₂, 75% N₂ and 10% H₂O. The effects of the purge-to-feed ratio (γ), cycle step time (t_s) (with all four steps of equal time), and pressure ratio (π _t) on the process performance was studied in terms of the CO₂ recovery (R) and enrichment (E) at a constant throughput θ of 14.4 L STP/hr/ kg. R increased with increasing γ and π_t and decreasing t_s, while E increased with increasing t_s and π _t and decreasing γ. The highest E of 3.9 was obtained at R = 87% and π_t = 12, whereas at R = 100% the highest E of 2.6 was obtained at π_t = 12. These results are very encouraging and show the potential of a high temperature PSA cycle for CO₂ capture.