Comparison of Carbon Dioxide Absorption in Aqueous MEA, DEA, TEA, and AMP Solutions

Abstract

The separation and capture process of carbon dioxide from power plants is garnering interest as a method to reduce greenhouse gas emissions. In this study, aqueous alkanolamine solutions were studied as absorbents for CO 2 capture. The solubility of CO 2 in aqueous alkanolamine solutions was investigated with a continuous stirred reactor at 313, 333 and 353 K. Also, the heat of absorption (−ΔH abs ) between the absorbent and CO 2 molecules was measured with a differential reaction calorimeter (DRC) at 298 K. The solubility and heat of absorption were determined at slightly higher than atmospheric pressure. The enthalpies of CO 2 absorption in monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), and 2-amino-2-methyl-1-propanol (AMP) were 88.91, 70.44, 44.72, and 63.95, respectively. This investigation showed that the heat of absorption is directly related to the quantity of heat for absorbent regeneration, and is dependent on amine type and CO 2 loading.

Opportunities for switchable solvents for lipid extraction from wet algal biomass: An energy evaluation

“…For secondary amines the binding energy is assumed to be 70 kJ/mol CO 2 . It is in the same range as reported by Kim et al [65].…”

Heat of absorption of carbon dioxide in mixtures of 2-amino-2-methyl-1-propanol and organic solvents

“…The heat of absorption reported for AMP in EG and in aqueous solutions shows a slower decrease, which is probably due to the formation of bicarbonate in aqueous AMP solutions and the contribution from the reaction of EG with the zwitterion (RNH + 2 COO − ), at higher loadings. Kim et al (2013) reported a heat of absorption for an aqueous solution of 30 wt% AMP of −63.95 kJ/mol CO 2 at a CO 2 loading of 0.862 mol CO 2 /mol AMP at 25 • C. This is slightly higher than the values reported by Mehdizadeh et al (2013), but lower than those reported by Arcis et al (2008) for the same AMP concentration. Fig.…”

Calcium Carbonate Precipitation for CO2 Storage and Utilization: A Review of the Carbonate Crystallization and Polymorphism

“…Surprisingly, the atmospheric level of CO2 has reached a significantly symbolic milestone, 400 parts per million (Scripps Institution of Oceanography, 2017), and moreover, a further continuous increase is expected for the foreseeable future in the absence of proper actions (Kim et al, 2013). In the context of global awareness of this issue, in 2015 COP21, also known as the 2015 Paris Climate Conference, proposed an agreement to keep the global average temperature rise below 2°C above preindustrial levels by limiting total carbon emissions in the atmosphere (COP21, 2015).…”