Kinetics of sulfur dioxide- and oxygen-induced degradation of aqueous monoethanolamine solution during CO2 absorption from power plant flue gas streams

Oxidative degradation of 2-ethanolamine: The effect of oxygen concentration and temperature on product formation

“…The experiments (Supap and present paper) were performed in different experimental setups and at different temperatures and CO2 concentrations which all would influence degradation. Supap (Supap et al, 2009) also found that temperature has a higher impact on the degradation than an increase in oxygen concentration as confirmed by this work. The low gas flow system described by Sexton (Sexton and Rochelle, 2009) is quite similar to the open batch system used in the present work.…”

“…Supap (Supap et al, 2009) found that the initial degradation rate for runs at 393 K for 100% oxygen concentration was about 28 times higher than the one at 21% oxygen concentration. As comparison the initial degradation rate for the data in this work was calculated using the same method (exponential function) as described by Supap (Supap et al, 2009).…”

“…As comparison the initial degradation rate for the data in this work was calculated using the same method (exponential function) as described by Supap (Supap et al, 2009). The initial degradation rate at 328 K for the run at 98% was 2.3 times higher than the one at 21% oxygen.…”

“…Lately there has been increased focus on the effect of temperature swing under industrial operation and an integrated solvent degradation apparatus (ISDA) was developed where the solvent is exposed to both oxidative and thermal degradation conditions in a single system (Closmann and Rochelle, 2011). Over the years several oxidative degradation experiments were performed by researchers studying different aspects of degradation like overall degradation rate (Blachly and Ravner, 1966;Chi and Rochelle, 2002), degradation products formed (da Silva et al, 2012;Lepaumier et al, 2009;Sexton and Rochelle, 2011;Supap et al, 2006), stability of the amines (Kohl and Nielsen, 1997;Lepaumier et al, 2009;Rooney et al, 1998) and the effects of oxidation catalyst (Goff and Rochelle, 2006), CO2 loading (Bello and Idem, 2006;Chi and Rochelle, 2002;Lawal et al, 2005;Rooney et al, 1998;Supap et al, 2009;Uyanga and Idem, 2007), inhibitors (Chi and Rochelle, 2002;Goff and Rochelle, 2006), amine and oxygen concentration (Bello and Idem, 2006;Goff and Rochelle, 2004;Supap et al, 2009;Uyanga and Idem, 2007), agitation rate (Goff and Rochelle, 2004), temperature (Bello and Idem, 2006;Lawal et al, 2005;Supap et al, 2009;Supap et al, 2001). The overall degradation rate was often determined by monitoring the evolution of NH3 (Chi and Rochelle, 2002) or a combination of NH3 and peroxide (Blachly and Ravner, 1966).…”

Oxidative degradation of amines using a closed batch system

“…Rooney suggested that increased CO2 concentration, and thereby ionic strength, may lower the O2 solubility (Rooney et al, 1998). Supap showed that the MEA degradation rate decreased with increasing CO2 loading (Supap et al, 2009). If this holds also for MMEA, the effect of gas phase NH3 could be even stronger that found in the above experiments as the CO2 loadings in the two experiments were respectively α=0.4 and α=0.2 without and with added ammonia.…”