Abstract
This research presents an electrochemical corrosion investigation to quantify the corrosiveness of carbon steel in blends of methyldiethanolamine (MDEA) and arginine (Arg) at two molar concentration and different solvent proportions. The selected temperatures range varied from 20 °C to 50 °C and the CO2 partial pressure was in the range of 49-100 kPa. The obtained data showed increased corrosion rate with increased CO2 partial pressure and increased the temperature of the solution. However, when added to MDEA, arginine was found to act as an inhibitor, the higher Arginine proportion in the mixture, the more inhibition effect was observed.
Highlights
The CO2 absorption process using aqueous amine solutions is still the choice for the removal of CO2 from natural and industrial gas streams
Electrochemical techniques were used to investigate the corrosiveness of blends of MDEA and Arginine on carbon steel at a total two molar concentration with different solvent proportions, temperatures, and different CO2 partial pressures
Increasing CO2 partial pressure led to increased CO2 loading in the solution, which in turn led to an increase in the corrosion rate
Summary
The CO2 absorption process using aqueous amine solutions is still the choice for the removal of CO2 from natural and industrial gas streams. Common industrial applications include natural gas processing, coal gasification, and manufacturing of hydrogen and ammonia Besides such industrial applications, the CO2 absorption process is considered to be a highly rated potential technique for reducing greenhouse gas emission from flue gas streams [1]. Amino acids typically have significantly lower vapor pressures, resulting in reduced solvent losses. They demonstrated greater resistance to oxidative degradation and lower toxicity than alkanolamines. Amino acids, such as arginine, glycine, alanine, and taurine, have been proposed as alternatives to amines in recent years [6, 7] and have been used commercially in acidic gas treating processes.
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