Corrosion studies of stainless steel and carbon steel in aqueous solutions of sodium glycinate used for CO2 capture
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Abstract
Corrosion is a well-known and serious issue in carbon dioxide (CO2) absorption process, which causes huge maintenance cost for restoration of corroded equipment and pipelines. Aqueous sodium glycinate (SG) is a potential solvent for CO2 capture. Corrosion study of SG solvent is very crucial for its practical applications, as such data is very limited in an open literature. Therefore, to address this significant gap, the corrosion rates of Stainless Steel (SS-304) and Carbon Steel (CS-1018) were investigated in this study by employing weight loss method using SG solvent at three different temperatures (303.15, 313.15, and 333.15 K) and concentrations (0.10, 0.20 and 0.30 mass fraction) of industrial importance. The results revealed that SS304 showed negligible corrosion in SG solvent with marginal effect of temperature and concentration. However, significant effect of temperature and concentration was observed on corrosion rate of CS1018 in SG solvent. At highest studied temperature of 333.15 K and high concentration (0.30 mass fraction), the corrosion rate of SS304 and CS1018 in SG solvent is 3.291 mpy and 32.203 mpy respectively. Moreover, the corrosion rate of CS1018 in SG solvent was compared with methyldiethanolamine (MDEA), monoethanolamine (MEA), and diethanolamine (DEA). It was found that SG solvent showed less corrosivity than various amine solvents. The findings of this study provide the guidance for practical application for SG solvent in CO2 capture process. Also, the data obtained could significantly help the design engineers to establish the appropriate operating conditions of CO2 capture process to control the corrosion.
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