Thermal Degradation Comparison of Amino Acid Salts, Alkanolamines and Diamines in CO2 Capture

Huang, Quanzhen; Thompson, Jesse; Lampe, Levi; Selegue, John P.; Liu, Kunlei

doi:10.1016/j.egypro.2014.11.197

Cited by 12 publications

(10 citation statements)

References 13 publications

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“…AHPD higher oxidative stability in the presence of Pz. Sodium salts of amino acids and 8 amines 76,97,99 Studying of amino acid salts to investigate their potential for CO 2 capture. Investigating degradation from a structural standpoint.…”

Section: Amines 71mentioning

confidence: 99%

Important Aspects Regarding the Chemical Stability of Aqueous Amine Solvents for CO₂ Capture

Vevelstad

Buvik

Knuutila

et al. 2022

Ind. Eng. Chem. Res.

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The chemical stability of aqueous amines is an essential property to study before new amines are introduced in pilot plants, to reduce risks related to the operation, cost and environment. There are no standard methods for studying degradation and no standardized way of knowing which components to search for. This work will give an overview of the current status of amine degradation research with recommendations for further work within this field. Degradation of aqueous amines in the CO 2 absorption process will always occur, though some amines are more stable than others. Degradation leads to compounds with various functional groups, some of which require monitoring from an environmental or health perspective. Future experimental activity should focus on closing the knowledge gaps. Improved knowledge could help to better predict and monitor degradation, help design better mitigation technologies, and minimize solvent degradation by finetuning the plant operation.

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Section: Amines 71mentioning

confidence: 99%

Important Aspects Regarding the Chemical Stability of Aqueous Amine Solvents for CO₂ Capture

Vevelstad

Buvik

Knuutila

et al. 2022

Ind. Eng. Chem. Res.

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“…Under simulated absorber conditions, dissolved metals iron and copper both promoted MEA oxidation, but only copper promoted the formation of nitrosamines . Moreover, many of the current thermal/oxidative degradation studies employ extreme conditions, ,− and therefore may not capture the degradation intermediates that are reactive nitrosamine precursors. For example, N -(2-hydroxyethyl)glycine was not reported as a major product from MEA degradation, ,− but N -nitroso-(2-hydroxyethyl)glycine accounted for 56% of total nitrosamines in a pilot unit .…”

Section: Influence Of Solvent Amine Structure On Nitrosamine and Nitr...mentioning

confidence: 99%

Nitrosamines and Nitramines in Amine-Based Carbon Dioxide Capture Systems: Fundamentals, Engineering Implications, and Knowledge Gaps

Mitch

Dai

2017

Environ. Sci. Technol.

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Amine-based absorption is the primary contender for postcombustion CO capture from fossil fuel-fired power plants. However, significant concerns have arisen regarding the formation and emission of toxic nitrosamine and nitramine byproducts from amine-based systems. This paper reviews the current knowledge regarding these byproducts in CO capture systems. In the absorber, flue gas NO drives nitrosamine and nitramine formation after its dissolution into the amine solvent. The reaction mechanisms are reviewed based on CO capture literature as well as biological and atmospheric chemistry studies. In the desorber, nitrosamines are formed under high temperatures by amines reacting with nitrite (a hydrolysis product of NO), but they can also thermally decompose following pseudo-first order kinetics. The effects of amine structure, primarily amine order, on nitrosamine formation and the corresponding mechanisms are discussed. Washwater units, although intended to control emissions from the absorber, can contribute to additional nitrosamine formation when accumulated amines react with residual NO. Nitramines are much less studied than nitrosamines in CO capture systems. Mitigation strategies based on the reaction mechanisms in each unit of the CO capture systems are reviewed. Lastly, we highlight research needs in clarifying reaction mechanisms, developing analytical methods for both liquid and gas phases, and integrating different units to quantitatively predict the accumulation and emission of nitrosamines and nitramines.

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“…Contrary to general expectations of enhanced chemical stability, amino acid sorbents have been found to have similar or even higher oxidative or thermal degradation rates compared to amine sorbents such as MEA. 3,4 Furthermore, the regeneration energy for aqueous amino acid salts, such as sodium glycinate, was found to be significantly higher (5743 kJ/kg CO2) than the regeneration energy of MEA (4503 kJ/kg CO2). 5 This is in spite of the reaction enthalpy for CO2 release being slightly lower for sodium glycinate compared to MEA (69 vs 79 kJ/mol), as sodium glycinate has considerably higher sensible heat and latent heat of vaporization than MEA.…”

Section: Introductionmentioning

confidence: 98%

Energy-Efficient CO₂ Capture from Flue Gas by Absorption with Amino Acids and Crystallization with a Bis-Iminoguanidine

Garrabrant

Williams

Holguin

et al. 2019

Ind. Eng. Chem. Res.

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A hybrid solvent/solid-state approach to CO2 separation from flue gas is demonstrated based on absorption with aqueous amino acids (i.e., glycine, sarcosine), followed by crystallization of the bicarbonate salt of glyoxal-bis(iminoguanidine) (GBIG), and subsequent solid-state CO2 release from the bicarbonate crystals. In this process, the GBIG bicarbonate crystallization regenerates the amino acid sorbent, and the CO2 is subsequently released by mild heating of the GBIG bicarbonate crystals, which results in quantitative, energy-efficient regeneration of GBIG. The cyclic capacities measured from multiple absorption-regeneration cycles are in the range of 0.2-0.3 mol CO2/mol amino acid. This hybrid CO2-separation approach reduces the sorbent regeneration energy by 24% and 40% compared to the regeneration energy needed for benchmark industrial sorbents monoethanolamine and sodium glycinate, respectively, while minimizing the amount of the amino acid sorbent loss through evaporation or degradation.

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Thermal Degradation Comparison of Amino Acid Salts, Alkanolamines and Diamines in CO2 Capture

Cited by 12 publications

References 13 publications

Important Aspects Regarding the Chemical Stability of Aqueous Amine Solvents for CO₂ Capture

Important Aspects Regarding the Chemical Stability of Aqueous Amine Solvents for CO₂ Capture

Nitrosamines and Nitramines in Amine-Based Carbon Dioxide Capture Systems: Fundamentals, Engineering Implications, and Knowledge Gaps

Energy-Efficient CO₂ Capture from Flue Gas by Absorption with Amino Acids and Crystallization with a Bis-Iminoguanidine

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Thermal Degradation Comparison of Amino Acid Salts, Alkanolamines and Diamines in CO2 Capture

Cited by 12 publications

References 13 publications

Important Aspects Regarding the Chemical Stability of Aqueous Amine Solvents for CO2 Capture

Important Aspects Regarding the Chemical Stability of Aqueous Amine Solvents for CO2 Capture

Nitrosamines and Nitramines in Amine-Based Carbon Dioxide Capture Systems: Fundamentals, Engineering Implications, and Knowledge Gaps

Energy-Efficient CO2 Capture from Flue Gas by Absorption with Amino Acids and Crystallization with a Bis-Iminoguanidine

Contact Info

Product

Resources

About

Important Aspects Regarding the Chemical Stability of Aqueous Amine Solvents for CO₂ Capture

Important Aspects Regarding the Chemical Stability of Aqueous Amine Solvents for CO₂ Capture

Energy-Efficient CO₂ Capture from Flue Gas by Absorption with Amino Acids and Crystallization with a Bis-Iminoguanidine