Corrosion Behavior of Carbon Steel in the CO₂ Absorption Process Using Aqueous Amine Solutions

Abstract

The present study provides comprehensive information on the effects of process parameter variations on the corrosion behavior of carbon steel in CO2 absorption systems using aqueous amine solutions. The process parameters of interest are amine type, concentration of the amine solutions, solution temperature, CO2 loading, and oxygen content. An electrochemical testing technique was used for determining the system corrosiveness in terms of polarization behavior and corrosion rate. The experimental results suggest that the corrosion behavior is considerably sensitive to the variations in the process parameters. Increases in amine concentration, solution temperature, CO2 loading, and oxygen content accelerate the corrosion rate in the systems. In addition, different amine types yield different degrees of the system corrosiveness. Comparisons of the corrosiveness among single amine systems as well as between mixed amine systems and their precursors are also presented.

Advances in Liquid Absorbents for CO2 Capture: A Review

“…In terms of corrosion, Veawab et al found that MEA is the most corrosive, followed by AMP and DEA, with MDEA being the least corrosive. 23 These alkanolamines have been used for both research and industrial use, and it is apparent that each absorbent has its own advantages and drawbacks. For a better performance at a lower cost, research and development efforts have been put into improving these absorbents, by combining them or by adding additives.…”

“…Table 2 lists down some of the hybrid absorbents made from mixing alkanolamine absorbents to improve their characteristics. Veawab et al 23 Thitakamol and Veawab 24 MEA-AMP Absorption column Aroonwilas and Veawab 4 Veawab et al 23 Choi et al 27 Thitakamol Hybrid absorbents have the potential to exceed the performance of single absorbent as proven by Yeon et al 31 They used MEA and TEA as absorbents to remove CO 2 from flue gas in a hollow fiber module membrane contactor. For the hybrid absorbent containing 5wt% TEA and 5wt% MEA, the process operated for 80 h with a CO 2 removal efficiency of 90%-95%.…”

“…In terms of corrosion, Veawab et al found that MEA is the most corrosive, followed by AMP and DEA, with MDEA being the least corrosive. 23 The blends of these amines have corrosion rates that lie between the individual amines. Figure 2 demonstrates the corrosion rates of the hybrid absorbents.…”

Corrosion in CO2Post-Combustion Capture with Alkanolamines – A Review

“…The acid gas loading is defined as the quantity of acid gas absorbed by a defined quantity of solvent and is often expressed in moles of acid gas per mole of amine. Increasing the acid gas loading increases the corrosivity of amine solutions [18,19,24,25].…”

“…DiEthanolAmine, DEA) slightly less and tertiary amines (e.g. Methyl DiEthanolAmine, MDEA) exhibit the lowest risks of corrosion [18,19,25,[27][28][29][30]. Amine concentration also has an influence on corrosion.…”