Thermal degradation of amino acid salts in CO2 capture

Huang, Quanzhen; Bhatnagar, Saloni; Remias, Joseph E.; Selegue, John P.; Liu, Kunlei

doi:10.1016/j.ijggc.2013.09.003

Cited by 32 publications

(26 citation statements)

References 18 publications

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“…A comparison of the thermal degradation rate of structural isomers with different amine order, Na--Ala and NaSar, has previously been reported [6]. Na--Ala, the primary amine, is found to degrade faster than Na-Sar, a secondary amine.…”

Section: Impact Of Amine Ordermentioning

confidence: 95%

“…Figure 2 presents a thermal degradation rate comparison of the sodium glycinate (Na-Gly), MEA and EDA, which are structural analogs with different functional groups, at 135 °C for 100 h. Na-Gly and EDA are the substitution of the hydroxyl group on MEA with a carboxylic acid group and an amine group respectively. These three compounds have similar amine basicity in terms of the amine pK a values [6]. The thermal stability has a trend of diamine > alkanolamine > amino acid salt.…”

Section: Impact Of Functional Groupsmentioning

confidence: 96%

“…The eluent was 0.10% formic acid in water (A) and in methanol (C). A gradient profile was utilized and described in previous publication [6]. The column temperature was 20 °C.…”

Section: Thermal Degradation Evaluationmentioning

confidence: 99%

“…The result suggests that, for both two carbon and three carbon backbone analogs, diamines are the most thermally stable species while amino acid salts are the least stable category, reflecting the different degradation mechanism of these three categories. Amino acid salts were reported to mainly undergo amide formation at high temperature stripping conditions, during which the amine groups function as a nucleophile to intermolecularly attack the carbonyl carbon and generate amides [6]. This one step reaction explains the fast thermal degradation rates of amino acid salts.…”

Section: Impact Of Functional Groupsmentioning

confidence: 99%

“…Some amino acid salts have been reported to be more oxidatively stable than MEA [5]. However, the thermal degradation of amino acid salts was only recently studied and was found to have enhanced thermal degradation rates compared to the reference MEA solvent [6].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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In the selection of candidates for post-combustion CO 2 absorption, solvent degradation has become a general concern due to the significant impact on operational cost and the intention to use thermal compression from high temperature stripping to minimize the overall process energy. In this research, structural analogs of amino acid salts, alkanolamines and diamines were thermally degraded in order to explore their thermal stability from a structural standpoint. Functional groups, amine orders and steric effect were investigated for their impact on amine thermal degradation. Primary amines with chain structures showed a thermal stability trend as diamine > alkanolamine > amino acid salt. For alknolamine and diamine structural isomers, the primary amines are more stable than the secondary amines. Steric hindrance around the amine group was shown to play a positive role in protecting amines against thermal degradation.

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Section: Impact Of Amine Ordermentioning

confidence: 95%

Section: Impact Of Functional Groupsmentioning

confidence: 96%

“…The eluent was 0.10% formic acid in water (A) and in methanol (C). A gradient profile was utilized and described in previous publication [6]. The column temperature was 20 °C.…”

Section: Thermal Degradation Evaluationmentioning

confidence: 99%

Section: Impact Of Functional Groupsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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A study on degradation and CO₂ capture performance of aqueous amino acid salts for direct air capture applications

Kiani,

Conway,

Abdellah

et al. 2024

Greenhouse Gases

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We have previously proposed amino acid salts solutions as potential absorption liquids for direct air capture (DAC) of CO2 from the atmosphere. However, little is known about their relevant CO2 solubilities, CO2 mass transfer rates, and susceptibility to oxidative and thermal degradation under conditions relevant to DAC. We report here on the overall solubility of CO2 and CO2 mass transfer rates into a series of amino acid salts solutions. Additionally, the robustness of various amino acid salt solutions to thermal and oxidative degradation has been assessed.CO2 absorption rates into the amino acid salts solutions were observed to be in the same order of magnitude as aqueous monoethanolamine (MEA), with sarcosinate and lysinate solutions providing the fastest and slowest CO2 mass transfer rates at 25°C, respectively. Degradation data revealed that all amino acid salt solutions investigated in this study displayed elevated rates of thermal degradation at both 120 and 150°C relative to MEA. The opposite trend was observed with respect to oxidative degradation where all amino acid salt solutions showed a greater resistance to oxidative degradation than that observed for MEA under the conditions investigated here. Considering the degradation, CO2 absorption capacity, and CO2 mass transfer rate data, we propose the potassium salts of proline and sarcosine as the most promising amino acid salts (of those considered here) for further evaluation in DAC processes. Overall, this study provides valuable insight into the suitability of various amino acid salt solutions as absorption liquid for DAC. © 2024 The Author(s). Greenhouse Gases: Science and Technology published by Society of Chemical Industry and John Wiley & Sons Ltd.

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Oxidative degradation of glycine in aqueous KOH/K₂CO₃ solutions for CO₂ capture

Ochedi,

Andresen,

van der Spek

2024

Greenhouse Gases

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Potassium hydroxide and potassium carbonate, being cost‐effective and environmentally friendly CO2 capture solvents, are promising candidates for carbon capture applications. Their slow absorption kinetics, however, necessitate strategies to enhance their rates, thereby reducing the capital costs of absorption equipment and saving energy for regenerating large volumes of solvent. Glycine, a potential additive, is explored for this purpose. While glycine‐based solvents are more stable than MEA, their amino functional group renders them susceptible to oxidative degradation. This study investigates the degradation of these solvents and the influence of potassium hydroxide and potassium carbonate on their stability. The experiment was performed under 100% O2 at 90 °C and 3 bar for about 3 weeks. It was observed that glycinate degraded by 53% for the glycinate‐only solution. The results also show that the addition of potassium hydroxide and potassium carbonate to a glycinate‐only solution had a mixed effect on the degradation of glycinate. Potassium hydroxide increased degradation by 5% compared to the glycinate‐only solution, while potassium carbonate decreased degradation by 4%. This order is supported by the degradation rate constants. Meanwhile, under N2, no significant change was observed in glycine concentration. Glycine's susceptibility to oxidative degradation is likely attributed to its less compact and rigid structure, resulting in weaker bonding and increased vulnerability to external factors. This instability leads to the formation of formate, carbonate, acetate, and oxalate as the primary degradation products across all studied solutions. A proposed mechanism for glycinate oxidative degradation sheds light on this process. These findings are crucial for informed decision making regarding performance trade‐offs in point source carbon capture and direct air capture, where oxygen is a prevalent gas component and potassium‐based solutions are commonly employed as absorbents. © 2024 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Thermal degradation of amino acid salts in CO2 capture

Cited by 32 publications

References 18 publications

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

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

A study on degradation and CO₂ capture performance of aqueous amino acid salts for direct air capture applications

Oxidative degradation of glycine in aqueous KOH/K₂CO₃ solutions for CO₂ capture

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Thermal degradation of amino acid salts in CO2 capture

Cited by 32 publications

References 18 publications

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

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

A study on degradation and CO2 capture performance of aqueous amino acid salts for direct air capture applications

Oxidative degradation of glycine in aqueous KOH/K2CO3 solutions for CO2 capture

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A study on degradation and CO₂ capture performance of aqueous amino acid salts for direct air capture applications

Oxidative degradation of glycine in aqueous KOH/K₂CO₃ solutions for CO₂ capture