Oxidative degradation mechanisms for amines in flue gas capture

Bedell, Stephen A.

doi:10.1016/j.egypro.2009.01.102

Cited by 76 publications

(95 citation statements)

References 32 publications

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“…Besides the emission of potentially harmful products, solvent degradation also impacts the process operating and capital costs. Indeed, the solvent absorption capacity decreases, its viscosity and its corrosivity increase, the vapour-liquid equilibrium is modified and foaming and fouling may appear in the columns (Bedell, 2009). So far, the process energy penalty and the degradation of amine solvents have been studied separately and previously published models of the CO 2 capture process did not consider solvent degradation at all (e.g.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Léonard

Toye

Heyen

2014

Computer Aided Chemical Engineering

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Solvent degradation may be a major drawback for the large-scale implementation of post-combustion CO 2 capture due to amine consumption and emission of degradation products. However, its influence on the process operations has rarely been studied. In the present work, a kinetics model describing solvent oxidative and thermal degradation has been developed based on own experimental results for the benchmark solvent, i.e. 30 wt% monoethanolamine (MEA) in water. This model has been included into a global Aspen Plus model of the CO 2 capture process. The selected process modelling approaches are described in the present work. Using the resulting simulation model, optimal operating conditions can be identified to minimize both the energy requirement and the solvent degradation in the process. This kind of process model assessing solvent degradation may contribute to the design of large-scale CO 2 capture plants to consider not only the process energy penalty, but also its environmental penalty. Indeed, both aspects are relevant for the large-scale deployment of the CO 2 capture technology.

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Section: Introductionmentioning

confidence: 99%

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Léonard

Toye

Heyen

2014

Computer Aided Chemical Engineering

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“…The primary degradation compounds are formed by either electron or hydrogen abstraction mechanisms (ammonia, aldehyde) or oxidation products of some of these compounds (acids). The initial mechanisms are still unclear, but the general impression is that the mechanisms either start with abstraction of an electron from the lone pair of nitrogen or abstraction of hydrogen from the nitrogen, α-carbon, or β-carbon, or a combination of these depending on the amine structure, nature of oxidants, pH, solvent effects and concentrations (Bedell, 2009;Chi and Rochelle, 2002;Rochelle, 2004, 2006;Hull et al, 1967;Hull et al, 1969;Rosenblatt et al, 1967;Sexton, 2008) Secondary degradation compounds are formed by reactions between primary degradation compounds and amines forming for example amides as N-(2-hydroxyethyl)-formamide (HEF), N-(2-hydroxyethyl)-acetamide (HEA) and N,-oxamide (BHEOX) from MEA and acid, or aldehyde and oxygen, and imidazoles as N-(2-hydroxyethyl)imidazole (HEI) from ammonia, MEA and several aldehydes. Lately several mechanisms have been suggested for the formation of secondary degradation compounds (da Silva et al, 2012;Lepaumier et al, 2011a;Strazisar et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Oxidative degradation of 2-ethanolamine: The effect of oxygen concentration and temperature on product formation

Vevelstad

Grimstvedt

Elnan

et al. 2013

International Journal of Greenhouse Gas Control

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Oxidative degradation experiments on 2-ethanolamine (MEA) were performed at four different oxygen concentrations and at two temperatures. MEA loss and degradation product build-up were measured. Increasing the temperature from 55 to 75 °C was shown to have higher impact on the MEA loss than increasing the oxygen concentration from 21 to 98%. Liquid end sample analyses were performed for all experiments and overall nitrogen balance tests were conducted for the experiments at 21% O2 (run 2), 50% O2 and 98% O2. Analysis of liquid and gas phase ammonia and MEA in the solvent was found to give a good overall picture of degradation in the MEA system. The degradation products formed at the different oxygen concentrations were the same as described in earlier literature. However, it was found that oxygen affects the formation of the individual degradation products differently. At 75 o C the development of degradation product concentrations with time was more complex. Laboratory reaction experiments were used to verify the formation of certain degradation products from some of the suggested mechanisms.

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“…Indeed, MEA has strong interaction with oxygen (Supap et al, 2001(Supap et al, , 2006Bello and Idem, 2005;Chi and Rochelle, 2002;Goff andRochelle, 2004, 2006;Sexton and Rochelle, 2009;Bedell, 2009Bedell, , 2011Bedell et al, 2011;Lepaumier et al, 2009b, c). Working closer to the absorption conditions, Sexton and Rochelle (2009) have shown that ammonia is the major by-product in the gas phase and is a good indicator of MEA oxidative degradation.…”

Section: Potential Interactions With the Solvent And The Incinerator mentioning

confidence: 99%

“…It has been demonstrated that metal present in setup serves as catalyst for oxidize the reaction. Bedell (2009) proposed a pathway using radical mechanisms for the oxidative degradation. As summarized in Figure 2, the metal cation reacts with oxygen to generate radicals which attack the MEA molecules.…”

Section: Potential Interactions With the Solvent And The Incinerator mentioning

confidence: 99%

Pilot Plant Studies for CO₂Capture from Waste Incinerator Flue Gas Using MEA Based Solvent

Aouini

Ledoux

Estel

et al. 2014

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-É tude du captage du CO 2 dans des gaz de combustion d'un incine´rateur de de´chets al 'aide d'un pilote utilisant un solvant a`base de MEA -L'e´tude e´value la faisabilite´du captage du dioxyde de carbone (CO 2 ) dans des gaz de combustion d'un incine´rateur de de´chets spe´ciaux. Un pilote a`l'e´chelle laboratoire a e´te´mis en oeuvre pour e´tudier le proce´ded 'absorption/de´sorption du CO 2 par un solvant a`base de MonoEthanolAmine (MEA). L'e´tude a e´te´conduite en laboratoire et sur un site industriel. L'installation expe´rimentale est instrumente´e pour obtenir des bilans de matie`re avec pre´cision. Une e´tude parame´trique en laboratoire a permis de mesurer le coefficient de transfert global K G a w pour plusieurs re´gimes de fonctionnement du pilote. Des expe´riences de longue dure´e, en laboratoire et sur site industriel, ont analyse´la re´sistance chimique de la MEA au gaz de combustion d'un incine´rateur. Ces expe´riences ont e´galement permis d'e´tudier l'absorption du dioxyde d'azote NO 2 et du dioxyde de soufre SO 2 dans le solvant de captage. Elles ont abouti a`une estimation de la cine´tique d'accumulation de sels stables dans un solvant a`base de MEA confronte´a`des gaz de combustion d'un incine´rateur.Abstract -Pilot Plant Studies for CO 2 Capture from Waste Incinerator Flue Gas Using MEA Based Solvent -Experimental study of carbon dioxide (CO 2 ) capture from waste incinerator flue gas is presented. A specific pilot plant has been achieved based on absorption/desorption process using MonoEthanolAmine (MEA) solvent. Several experiments have been carried out at laboratory and industrial site. The pilot is fully instrumented to establish precise balances. Laboratory experiments allow to measure overall mass transfer coefficient K G a w for several pilot operating conditions. Long laboratory and industrial runs provide an estimation of MEA chemical resistance against waste incinerator flue gas. The experiments also allowed the analysis of NO 2 and SO 2 absorption through the solvent as well as the accumulation of Heat Stable Salts (HSS) for a full scale CO 2 capture unit fed by a waste incinerator flue gas. Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 69 (2014)

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Oxidative degradation mechanisms for amines in flue gas capture

Cited by 76 publications

References 32 publications

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Oxidative degradation of 2-ethanolamine: The effect of oxygen concentration and temperature on product formation

Pilot Plant Studies for CO₂Capture from Waste Incinerator Flue Gas Using MEA Based Solvent

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Oxidative degradation mechanisms for amines in flue gas capture

Cited by 76 publications

References 32 publications

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Assessment of Solvent Degradation within a Global Process Model of Post-Combustion CO2 Capture

Oxidative degradation of 2-ethanolamine: The effect of oxygen concentration and temperature on product formation

Pilot Plant Studies for CO2Capture from Waste Incinerator Flue Gas Using MEA Based Solvent

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Product

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Pilot Plant Studies for CO₂Capture from Waste Incinerator Flue Gas Using MEA Based Solvent