The analysis of solubility, absorption kinetics of CO₂ absorption into aqueous 1‐diethylamino‐2‐propanol solution

Abstract

In this present work, the CO2 absorption performance of aqueous 1‐diethylamino‐2‐propanol (1DEA2P) solution was studied with respect to CO2 equilibrium solubility, absorption kinetics, and absorption heat. The equilibrium solubility of CO2 in 2M 1DEA2P solution was measured over the temperature range from 298 to 333 K and CO2 partial pressure range from 8 to101 kPa. The absorption kinetics data were developed and analyzed using the base‐catalyzed hydration mechanism and artificial neural network models (radial basis function neural network [RBFNN] and back‐propagation neural network [BPNN] models) with an acceptable absolute average deviation of 10% for base‐catalyzed hydration mechanism, 2.6% for RBFNN model and 1.77% for BPNN model, respectively. The CO2 absorption heat of 1DEA2P was estimated to be −43.6 kJ/mol. In addition, the ions (1DEA2P, 1DEA2PH+, , CO32−) speciation plots of the 1DEA2P‐CO2‐H2O system were developed to further understand the reaction process of 1DEA2P with CO2. Based on a comparison with conventional amines (e.g., MEA, DEA, MDEA) and alternative amines (i.e., 1DMA2P and 4‐(diethylamino)−2‐butanol [DEAB]), 1DEA2P exhibited good performance with respect to CO2 equilibrium solubility, reaction kinetics, and CO2 absorption heat. Meanwhile, the overall evaluation of 1DEA2P for application in CCS in terms of absorption and desorption is presented, giving helpful information for the screening of these novel amines. © 2017 American Institute of Chemical Engineers AIChE J, 63: 2694–2704, 2017

Study of Equilibrium Solubility, NMR Analysis, and Reaction Kinetics of CO2 Absorption into Aqueous N1,N2-Dimethylethane-1,2-diamine Solutions

“…In addition, to evaluate the CO 2 absorption performance of DMEDA for CO 2 capture in terms of the CO 2 equilibrium solubility, a comparison between DMEDA and other widely used conventional amines (2-methylpiperazine (2MPZ), 1diethylamino-2-propanol (1DMA2P), 27 EDA, 28 and N-(2hydroxyethyl)pyrrolidine (1-(2HE)PRLD) 18 ) is made as shown in Figure 5. It shows clearly that DMEDA has the highest CO 2 equilibrium solubility compared to tertiary amines at the same CO 2 partial pressure.…”

Effects of Transition Metal Oxide Catalysts on MEA Solvent Regeneration for the Post-Combustion Carbon Capture Process

“…Puxty et al analyzed 76 amines including primary, secondary, and tertiary amines; alkanolamines; polyamines; and amino acids to find better amine solvents, on the basis of absorption capacity and kinetics comparable to MEA. Recently, diethylenetriamine (DETA), 1-dimethylamine-2-propanol (1DMA2P), 1-diethylamino-2-propanol (1DEA2P), and triethylenetetramine (TETA) and its blend with MDEA have also been studied and found to have a lower regeneration heat duty than MEA. − However, the vital factors required for commercialization of any solvent such as the availability, price, process economics, and annual productions of these solvents are yet to be evaluated.…”

Reducing Heat Duty of MEA Regeneration Using a Sulfonic Acid-Functionalized Mesoporous MCM-41 Catalyst

“…Third, the desorption heat is used to break the chemical bond between CO 2 and MEA, which account for approximately 50% of the total energy consumption of 5 M CO 2 -rich MEA regeneration . To reduce the energy consumption for amine regeneration, much effort has been put into solving this problem, such as screening for a novel amine, − using blended amine, designing for better mass and heat transfer, optimizing the process configuration, , and developing biphasic solvents. − …”