Comparative Study of CO2 Absorption in Aqueous Mixtures of Methyldiethanolamine (MDEA) and Methanol, Focusing on the Temperature and Concentration Influence over the Absorption Rate

F.J. Tamajón; Estrella Álvarez; F. Cerdeira; M.E. Vázquez

doi:10.4028/www.scientific.net/DDF.353.193

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 353Comparative Study of CO2 Absorption in Aqueous...

Comparative Study of CO₂ Absorption in Aqueous Mixtures of Methyldiethanolamine (MDEA) and Methanol, Focusing on the Temperature and Concentration Influence over the Absorption Rate

Abstract:

The use of tertiary methyldiethanolamine (MDEA) as an absorbent for the CO₂ removal from process gas streams has increased due to its advantages over primary and secondary amines. Methanol is also widely used as an organic physical solvent for the CO₂ capture. Mixed solvents are expected to have a higher capacity for the acid gases than the solvent alone. The chemical absorption rate of CO₂ was measured in mixtures of MDEA (weight 5%, 15% and 30%) and water-methanol solutions at different % weight relations by using a stirred-cell reactor with plane gas-liquid interface. Experiments provided data measured at a range from 283.15 K to 313.15 K operation temperatures. Results show how the solubility of CO₂varies in all systems involved focusing on temperature and concentration changes. The solubility of CO₂ in the aqueous mixed MDEA with methanol as a solvent becomes significantly greater than in the aqueous amine alone.