Abstract
The feasibility of recovering CO[sub 2] from flue gas to generate a high-purity product by pressure swing adsorption (PSA) is studied by simulation using a proven predictive PSA model. Two promising sorbents, activated carbon and carbon molecular sieve, are examined. A nonconventional PSA cycle is designed for this purpose. With activated carbon as the sorbent, CO[sub 2] can be concentrated from 17% in the flue gas to a product of 99.997% (at a CO[sub 2] recovery of 68.4% and at a reasonably high feed throughput). Despite the favorable kinetic selectivity for CO[sub 2] in the carbon molecular sieve, separation results using this sorbent are not as good, because the kinetic selectivity (of CO[sub 2]/N[sub 2]) is not high enough and consequently the equilibrium selectivity dominates the separation.
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