Characteristics of absorption/regeneration of CO2–SO2 binary systems into aqueous AMP+ammonia solutions

Post-combustion CO2 capture by aqueous ammonia: A state-of-the-art review

“…According to reaction competition order, SO 2 and NO 2 can be more easily removed than CO 2 by aqueous ammonia as expected, which means that the SO 2 and NO 2 should have higher removal efficiency than CO 2 under the same conditions, e.g., an experimental result using injection of ammonia with water vapor showed that CO 2 and SO 2 can be removed with the maximum efficiency of 70% and 95% in the reaction temperature of 55-60 • C, respectively (Diao et al, 2004b). With ammonia added into AMP solution, the removal efficiency for CO 2 and SO 2 can be raised to over 90% and over 98% in the optimum conditions, respectively (Choi et al, 2009). With respect to heavy trace metals, Wang et al (2008) found that as ammonia concentration increases, the absorption efficiency for oxidized trace metals showed a decreased trend, suggesting high ammonia concentration was adverse to the removal of heavy trace metals in post-combustion flue gas.…”

Experimental study on CO2 capture by chilled ammonia process

“…The higher liquid to gas ratio require large amount of absorbent but a shorter column, while low L/G value require a low liquid flow rate and a taller column [19]. In case of experimental study using wetted column has generally been used G/L ratio in the range of 5-20 L/m 3 [2,18,20,21].…”

Mass transfer and kinetics study on combined CO2 and SO2 absorption using aqueous ammonia

“…Correspondingly, Qin et al (2010) and Liu et al (2012) reported that the CO 2 mass transfer process in aqueous NH 3 is determined by the reaction rate, and explained using the pseudofirst order-reaction mechanism. Choi et al (2009) determined that the SO 2 mass transfer in aqueous NH 3 is following the instantaneous reaction mechanism. When the reaction rate is much higher than diffusion, the diffusion rate of active NH 3 in liquid film is lower than its potential consumption, and thus, the mass transfer rate is limited by the diffusion rate of active NH 3 .…”

“…However, there is currently insufficient information on combined CO 2 and SO 2 absorption in aqueous NH 3 in the public domain, especially on the mass transfer and kinetics of combined CO 2 and SO 2 absorption. Choi et al (2009) reported that the aqueous 2-amino-2-methyl-1-propanol (AMP) and NH 3 blend solvent can simultaneously absorb CO 2 and SO 2 . Aqueous NH 3 , as an effective additive, can obviously enhance the mass transfer rate of CO 2 .…”