Nonaqueous amine-based absorbents for energy efficient CO2 capture

Guo, Hui; Li, Chenxu; Shi, Xiaoqing; Li, Hui; Shen, Shufeng

doi:10.1016/j.apenergy.2019.02.019

Cited by 188 publications

(97 citation statements)

References 67 publications

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“…27,28 These solvents are described as nonaqueous, water-free, or water-lean solvents, and they have been increasingly studied. 29,30 Alkanolamine-alcohol blends are characterized by their high boiling point, low specific heat capacity, and low vaporization enthalpy. Such solvents can change phases upon their loading and separate into CO 2 -lean and CO 2 -rich phases, 31,32 where only the rich phase is sent into the stripper resulting in energy savings.…”

Section: Introductionmentioning

confidence: 99%

Optimization of novel nonaqueous hexanol‐based monoethanolamine/methyl diethanolamine solvent forCO₂absorption

Cihan

Ali

Khalifa

et al. 2022

Intl J of Energy Research

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Chemical absorption of CO 2 into aqueous amine-based solvents is known as the most mature technology featuring high separation efficiencies and applicability of retrofitting. The high regeneration energy requirement of the process is a major drawback, and improvements in solvent design are required. This study investigated the CO 2 absorption and desorption performance of the nonaqueous monoethanolamine (MEA)/methyl diethanolamine (MDEA) blend experimentally using a stirred cell reactor. CO 2 loading, cyclic capacity loss, and initial absorption rate were measured for different solvent formulations and compared to single amines (MEA or MDEA). A mixture-process design and response surface methodology were employed to model and optimize the solvent formulation at different temperatures and pressures. The single-response optimization yielded 0:83 mol CO 2 =mol amine (at 0% MEA and 303 K/0.5 barg) and 3.17e-5 kmol/m 2 Ás (at 40% MEA and 310.67 K/0.5 barg) as optimal absorption capacity and rate of absorption, respectively. The multiresponse optimization was conducted using the composite desirability function yielding 0:653 mol CO 2 =mol amine and 2.987e-5 kmol/m 2 Ás (D = 0.903). The multiresponse optimization was also extended to include the impact of different initial settings and importance ratios between the absorption capacity and rate of absorption, in which the latter needed at least 1.6 higher importance level to influence the multiresponse optimization.

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Section: Introductionmentioning

confidence: 99%

Optimization of novel nonaqueous hexanol‐based monoethanolamine/methyl diethanolamine solvent forCO₂absorption

Cihan

Ali

Khalifa

et al. 2022

Intl J of Energy Research

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“…Hence, the strategy of CO 2 capture and utilization (CCU) came up, which aimed at the profitable conversion rather than the unhelpful storage after CO 2 was captured [17][18][19][20][21][22][23][24]. In this area, a rational choice for the absorbents that are used to fix CO 2 as well as induce the following conversion is vitally important [25][26][27][28][29][30][31]. Particularly, amino alcohols are considered as one of the most effective options due to the advantages of economy, low toxicity, strong absorption of CO 2 , excellent stability of corresponding products, etc.…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of 2-Oxazolidinones by an Efficient and Recyclable CuBr/Ionic Liquid System via CO2, Propargylic Alcohols, and 2-Aminoethanols

Gong

et al. 2021

Catalysts

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With the aim of profitable conversion of carbon dioxide (CO2) in an efficient, economical, and sustainable manner, we developed a CuBr/ionic liquid (1-butyl-3-methylimidazolium acetate) catalytic system that could efficiently catalyze the three-component reactions of propargylic alcohols, 2-aminoethanols, and CO2 to produce 2-oxazolidinones and α-hydroxy ketones. Remarkably, this catalytic system employed lower metal loading (0.0125–0.5 mol%) but exhibited the highest turnover number (2960) ever reported, demonstrating its excellent activity and sustainability. Moreover, our catalytic system could efficiently work under 1 atm of CO2 pressure and recycle among the metal-catalyzed systems.

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“…The commercialization of the MEA‐based absorption process has been based on the solvent's high reactivity with CO 2 and low price 12–15 . However, the remaining disadvantages include large energy consumption for solvent regeneration, corrosion of process equipment, and continuous make‐up of monoethanolamine (MEA) during the operation due to its high volatility and low thermal stability.…”

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

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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.

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Nonaqueous amine-based absorbents for energy efficient CO2 capture

Cited by 188 publications

References 67 publications

Optimization of novel nonaqueous hexanol‐based monoethanolamine/methyl diethanolamine solvent forCO₂absorption

Optimization of novel nonaqueous hexanol‐based monoethanolamine/methyl diethanolamine solvent forCO₂absorption

Green Synthesis of 2-Oxazolidinones by an Efficient and Recyclable CuBr/Ionic Liquid System via CO2, Propargylic Alcohols, and 2-Aminoethanols

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

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Nonaqueous amine-based absorbents for energy efficient CO2 capture

Cited by 188 publications

References 67 publications

Optimization of novel nonaqueous hexanol‐based monoethanolamine/methyl diethanolamine solvent forCO2absorption

Optimization of novel nonaqueous hexanol‐based monoethanolamine/methyl diethanolamine solvent forCO2absorption

Green Synthesis of 2-Oxazolidinones by an Efficient and Recyclable CuBr/Ionic Liquid System via CO2, Propargylic Alcohols, and 2-Aminoethanols

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

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Product

Resources

About

Optimization of novel nonaqueous hexanol‐based monoethanolamine/methyl diethanolamine solvent forCO₂absorption

Optimization of novel nonaqueous hexanol‐based monoethanolamine/methyl diethanolamine solvent forCO₂absorption

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