Comparative Analysis of the Carbon Dioxide Absorption and Recuperation Capacities in Aqueous 2-(2-Aminoethylamino)ethanol (AEE) and Blends of Aqueous AEE and N-Methyldiethanolamine Solutions

Abstract

A study of carbon dioxide (CO 2 ) absorption/desorption has been carried out in diverse aqueous amine solutions consisting of 2-(2-aminoethylamino)ethanol (AEE), monoethanolamine (MEA), and the blends of AEE and N-methyldiethanolamine (MDEA) at different concentrations to compare the CO 2 loading and recuperation properties of these amines. The CO 2 absorption loading has been estimated in 0.476, 0.951, 1.427, and 2.378 M AEE solutions, a 2.378 M MEA solution, and two blends of 1.427 M AEE + 0.418 M MDEA and 1.427 M AEE + 0.836 M MDEA with two CO 2 concentrations of 5.01 and 100 vol % at 23 °C and a flow rate of 3.067 L/min. The CO 2 desorption was performed by heating these solutions at 100-102 °C. The results revealed that the AEE diamine possesses a greater CO 2 absorption capacity than MEA while its CO 2 desorption capacity was inferior to that observed for MEA. Moreover, the CO 2 recuperation capacity obtained for AEE was greater than that of MEA at the same concentration. Interestingly, the CO 2 absorption in an aqueous AEE solution was also slightly increased in the presence of MDEA while its desorption was highly enhanced, resulting in an increase of about 15% of its CO 2 recuperation capacity. Taken together, these results suggest that the structural properties of AEE, including the presence of two amino groups, as compared to MEA could favor its CO 2 absorption and recuperation capacities. Therefore, AEE and the blends of AEE + MDEA could represent interesting absorbents for the development of new methods to eliminate the CO 2 emanation into the atmosphere by industrial combustion processing.

CO2 capture by aqueous solutions of glucosamine in a bubble column reactor

“…3, and these data indicate that an increase in the amine concentration produces a decrease in the CO 2 loading. This behaviour is in agreement with previous studies using different amines as a reagent to capture acid gases [11][12][13]. This behaviour has been assigned to different causes in previous works: (i) an increase in the liquid phase viscosity due to an increase in the amine concentration, that produces a decrease in the diffusion coef- ficients, and (ii) aggregation processes between amine molecules when the concentration increases, being an inconvenient to the access of CO 2 molecules into the amino group in order to produce the reaction.…”

Solubility of CO2 in Nonaqueous Absorption System of 2-(2-Aminoethylamine)ethanol + Benzyl Alcohol

“…2−5 Among them, aqueous 2-(2-aminoethylamine)ethanol (AEEA) solutions (5 to 25) wt % have a CO 2 capacity of (1.35 to 1.12) mol CO 2 /mol amine at 296 K and atmospheric pressure. 2,3 In the modern industry, the heat of regeneration for the stripping out of CO 2 from rich amine solutions in a regeneration process, which consists of sensible heat, reaction heat, latent heat of partial water, and partial latent heat of solvent vaporization, contributes (50 to 80) % of the total energy consumption in a chemical solvent based on the CO 2 separation process. 6 Many researchers have used blended amines, a solution of two or more amines in a variety of compositions, to improve absorption or desorption ability.…”

A 13C NMR investigation of CO2 absorption and desorption in aqueous 2,2′-iminodiethanol and N-methyl-2,2′-iminodiethanol

“…In particular, aqueous alkanolamines have been largely exploited as efficient solvents to separate and recover CO 2 from steel and cement production plants, to reduce greenhouse gas emissions from fossil fuel fired power plants, and in areas related to petroleum drilling and natural gas purification (Astarita et al, 1984;Bonenfant et al, 2005;Choi et al, 2007;Idem et al, 2006;Jassim and Rochelle, 2006;Oyenekan and Rochelle, 2006;Park et al, 2002;Yeh et al, 2001). In postcombustion capture methods, alkanolamines quickly react with low CO 2 content (5-10%) flue gas with high absorption efficiency and good loading capacity.…”