CO2 Absorption Rate and Solubility in Monoethanolamine/Piperazine/Water

Abstract

The solubility and absorption rate of carbon dioxide into monoethanolamine/ piperazine/water were measured in a wetted wall column at 40-60°C. The total amine concentration was varied from 1.0 M to 5.0 M with monoethanolamine blends containing 0 to 1.2 M piperazine. CO 2 solubility and solution speciation were simulated by nine equilibrium reactions. Two of the equilibrium constants were adjusted to match literature data. The rate of absorption was predicted by the theory of diffusion with fast chemical reaction. Piperazine at 24 mol% of the total amine decreases CO 2 equilibrium pressure by 50% and enhances CO 2 absorption rate by 50% to 100%. The CO 2 enhancement factor decreases by an order of magnitude as loading increases from 0 to 0.5 moles CO 2 /mole amine.

Methyldiethanolamine and Piperazine as Extractant in Emulsion Liquid Membrane for Carbon Dioxide Removal

“…This approach is in agreement with Bishnoi et al, [38], Dang and Rochelle [39], Cullinane et al, [40] and Khalili et al, [41] that also proposed the used of piperazine as an activator to other slower alkanolamines such as MDEA. It was also reported that piperazine has a rapid reaction rate with CO 2 than MEA [42], [43].…”

Integrating MEA Regeneration with CO2 Compression and Peaking to Reduce CO2 Capture Costs

“…In previous work, research at the University of Texas defined the actual energy, ideal/theoretical energy, and lost work involved with MEA absorption and stripping approaches (Rochelle, 2003). The result was that more than half of the energy required by a standard MEA and CO 2 compression approach was the result of lost work; losses in the MEA stripper were the largest (~70% of total).…”

“…Previous research suggested that more than half of the energy required by a standard MEA and CO 2 compression approach was the result of lost work; losses in the MEA stripper were the largest (Rochelle, 2003). Several innovative processing approaches were proposed to reduce this lost work by up to 20%; in general, these approaches involved integrating the need for heat in the MEA stripper with the needs of the CO 2 compression train and reducing temperature approaches in the lean/rich exchanger.…”

Dynamic simulation of MEA absorption process for CO2 capture from power plants

“…MEA has been blended with amines that are less corrosive and require less steam to regenerate such as MEA/2-amino-2-methyl-1-propanal (AMP) (Dey and Aroonwilas, 2009) and MEA/MDEA (Idem et al, 2006). The additive piperazine (PZ) in MEA solutions was able to accelerate CO 2 absorption and allows use of lower MEA concentrations (Dang and Rochelle, 2003;Dugas and Rochelle, 2011). Freeman et al, 2010 proposed new amine solvent, i.e., concentrated aqueous piperazine (PZ), which has an absorption rate that is higher than MEA.…”