Correlation of CO2 absorption performance and electrical properties in a tri-ethanolamine aqueous solution compared to mono- and di-ethanolamine systems

Han, Sang‐Jun; Wee, Jung‐Ho

doi:10.1007/s11356-020-10334-w

Cited by 5 publications

(8 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This can be explained by the reaction order of eq , which is the net reaction of eqs and , being higher than that of eq . On the other hand, the variation of OAR in the AMP system followed a parabolic curve, such as for a single base-catalytic reaction that is generally observed in the absorption with tertiary amine solvents such as TEA and MDEA . The OAR gradually decreased according to C ini from a maximum of 17.98 mmol CO 2 /(L·min) in the 0.5 M AMP solution to 11.77 mmol CO 2 /(L·min) in the 4.0 M solution.…”

Section: Resultsmentioning

confidence: 99%

CO₂ Absorption Performance and Electrical Properties of 2-Amino-2-methyl-1-propanol Compared to Monoethanolamine Solutions as Primary Amine-Based Absorbents

Han

Wee

2021

Energy Fuels

Self Cite

View full text Add to dashboard Cite

Two CO 2 chemical absorption systems using 2-amino-2-methyl-1-propanol (AMP) and monoethanolamine (MEA) aqueous solutions are qualitatively compared in terms of absorption performance and electrical properties. While the absorption capacity is close to their theoretical values in the solutions of concentrations less than 2.0 M AMP and 0.4 M MEA, it decreases below the theoretical values according to the initial concentration (C ini ) in the AMP solutions above 2.0 M, and the primary reaction is changed in the MEA solutions above 0.4 M. Unlike the MEA system, the absorption completion time increases proportionally to C ini in the AMP system to be about 247.4 min at the 4.0 M solution; however, the variation of the overall absorption rate of CO 2 follows a parabolic function of C ini with a maximum of 17.98 mmol CO 2 /(L•min) in the 0.5 M solution. This difference is primarily due to the instability of AMP carbamate (AMPCOO − ) caused by the steric hindrance effects and the inhibition of the MEACOO − hydrolysis in the two relatively high-concentration solutions. Especially, the amount of generated free-AMP is reduced by the combination of the protonated AMP (AMPH + ) generated with AMPCOO − in the high-concentration solutions. The ionic conductivity of AMPH + is 29.1 S•cm 2 /(mol•z), which is 53.2% less than that of MEAH + , and the real ionic activity coefficient (RIAC) in the AMP system is always less than that in the MEA system at the same concentration as well as the decreasing ratio of RIAC according to C ini in the AMP system, 0.10 L/mol, was higher than that in the MEA system. The chemical CO 2 absorption capacity required to raise the same electrical conductivity in the AMP solution is larger than that in the MEA at the same concentration. These differences between the two systems can be attributed to their different molecular structures and sizes.

show abstract

Section: Resultsmentioning

confidence: 99%

CO₂ Absorption Performance and Electrical Properties of 2-Amino-2-methyl-1-propanol Compared to Monoethanolamine Solutions as Primary Amine-Based Absorbents

Han

Wee

2021

Energy Fuels

Self Cite

View full text Add to dashboard Cite

show abstract

“…CAC chem indicates the amount of CO 2 chemically absorbed according to Eqn (), and it is calculated by subtracting the physical absorption capacity (CAC phy ) from CAC total experimentally measured by the gas analyzer. The CAC phy of each amine solution was calculated based on the water concentration and the total amount of CO 2 absorbed of pure water, which were reported in our previous works 36 …”

Section: Resultsmentioning

confidence: 99%

“…In the present study, therefore, the CO 2 absorption performance, such as chemical absorption capacity (CAC chem ), amine utilization, and overall absorption rate (OAR) of the MDEA and TEA systems, as well as their electrical properties, was investigated and the results were systematically compared and analyzed based on amine molecular structure and size. In addition, the ionic conductivity (IC) of protonated MDEA and the real ionic activity coefficient (RIAC) in high‐concentration MDEA solutions were estimated using the EC of the solution measured during the absorption, which were also compared to those of TEA system 36 . Finally, the equations were generalized to enable in situ estimation of CAC chem by measuring EC in high‐concentration MDEA and TEA solutions.…”

Section: Introductionmentioning

confidence: 99%

Comparison of CO₂ absorption performance between methyl‐di‐ ethanolamine and tri‐ethanolamine solution systems and its analysis in terms of amine molecules

Han

Wee

2021

Greenhouse Gases

View full text Add to dashboard Cite

The present study analyzes the features of chemical CO2 absorption using tertiary amine solvents by comparing the absorption performance and electrical properties between methyl‐di‐ethanolamine (MDEA) and tri‐ethanolamine (TEA) systems. The results are mostly attributed to the different structures of the two amine molecules. Absorption performance is significantly affected by the molecular structure and water concentration in the amine solution. The absorption performance of the MDEA system is better than that of TEA, which is basically ascribed to the MDEA molecule's more asymmetric and irregular shape than that of TEA, which thus enhances the catalytic activity of MDEA and the reactivity of the −OH moiety in water. The difference of electrical properties such as ionic conductivities (ICs) of the two protonated amines and real ionic activity coefficients (RIAC) between the two systems might be also caused by the different molecular structures of the two amines. The IC of protonated MDEA is estimated to be 23.70% higher than that of protonated TEA, because of the higher ionic mobility and charge density of MDEA. The RIAC of the MDEA system is higher than that of TEA, which is explained by the different physicochemical interactions between the molecules in the two systems. Since water is one of the reactants in the absorption, its concentration in solution significantly affects the results of the systems. In addition, the absorption using tertiary amine is a base‐catalyzed reaction, and thus variations of the overall absorption rate follow a parabolic curve. Therefore, it is maximized to be 14.2 and 9.8 mmol CO2·L−1·min−1 in the 15 wt% MDEA and TEA solutions, respectively. Finally, the correlated equations for in situ estimation of chemical absorption capacity by electrical conductivity measured during the absorption are derived in the two systems. © 2021 The Authors. Greenhouse Gases: Science and Technology published by Society of Chemical Industry and John Wiley & Sons, Ltd.

show abstract

“…Postcombustion capture is categorized into chemical absorption, physical adsorption, and membrane separation. Chemical absorption has been developed as one of the most promising methods for industrial CO 2 capture 2‐7 . During the chemical absorption process, the solvent significantly influences CO 2 capture performance 8‐11 …”

Section: Introductionmentioning

confidence: 99%

“…Chemical absorption has been developed as one of the most promising methods for industrial CO 2 capture. [2][3][4][5][6][7] During the chemical absorption process, the solvent significantly influences CO 2 capture performance. [8][9][10][11] Amine solutions, such as monoethanolamine, methyldiethanolamine (MDEA), 2-amino-2-methyl-1-propanol (AMP)/piperazine solution, and mixture amines, are conventional solvents used to capture CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Carbon dioxide desorption intensified by metal atom

Zhang

Zhou

et al. 2021

Intl J of Energy Research

View full text Add to dashboard Cite

Summary Chemical absorption is an effective method to capture CO2 in industry. The advanced solvent is the key to improve CO2 capture performance. The single atom fluid, containing a single metal atom in a solvent, is developed as a new solvent to reduce the energy consumption. A density functional theory model coupled with fluid flow is developed for the single atom fluid to capture CO2. The experiment is performed to validate the model. According to the model, the effects of temperature, pressure, and weight fraction on CO2 capture performance are studied carefully. It is concluded that the CO2 desorption occurs at 333 K and the mass transfer coefficient is improved up to 17.95%. The film stretch phenomenon is identified, which produces the slag phenomenon by increasing and decreasing of temperature, pressure, and weight fraction to intensify the CO2 capture. The mass transfer coefficient improvement is attributed to thinner film, resulting in mass transfer resistance reduction. The energy consumption is finally reduced to 0.85 GJ/t against the conventional 3.0 to 3.9 GJ/t. This provides an alternative and effective method for CO2 capture.

show abstract

Correlation of CO2 absorption performance and electrical properties in a tri-ethanolamine aqueous solution compared to mono- and di-ethanolamine systems

Cited by 5 publications

References 42 publications

CO₂ Absorption Performance and Electrical Properties of 2-Amino-2-methyl-1-propanol Compared to Monoethanolamine Solutions as Primary Amine-Based Absorbents

CO₂ Absorption Performance and Electrical Properties of 2-Amino-2-methyl-1-propanol Compared to Monoethanolamine Solutions as Primary Amine-Based Absorbents

Comparison of CO₂ absorption performance between methyl‐di‐ ethanolamine and tri‐ethanolamine solution systems and its analysis in terms of amine molecules

Carbon dioxide desorption intensified by metal atom

Contact Info

Product

Resources

About

Correlation of CO2 absorption performance and electrical properties in a tri-ethanolamine aqueous solution compared to mono- and di-ethanolamine systems

Cited by 5 publications

References 42 publications

CO2 Absorption Performance and Electrical Properties of 2-Amino-2-methyl-1-propanol Compared to Monoethanolamine Solutions as Primary Amine-Based Absorbents

CO2 Absorption Performance and Electrical Properties of 2-Amino-2-methyl-1-propanol Compared to Monoethanolamine Solutions as Primary Amine-Based Absorbents

Comparison of CO2 absorption performance between methyl‐di‐ ethanolamine and tri‐ethanolamine solution systems and its analysis in terms of amine molecules

Carbon dioxide desorption intensified by metal atom

Contact Info

Product

Resources

About

CO₂ Absorption Performance and Electrical Properties of 2-Amino-2-methyl-1-propanol Compared to Monoethanolamine Solutions as Primary Amine-Based Absorbents

CO₂ Absorption Performance and Electrical Properties of 2-Amino-2-methyl-1-propanol Compared to Monoethanolamine Solutions as Primary Amine-Based Absorbents

Comparison of CO₂ absorption performance between methyl‐di‐ ethanolamine and tri‐ethanolamine solution systems and its analysis in terms of amine molecules