The Stabilization of Monoethanolamine Solutions for Submarine Carbon Dioxide Scrubbers

Blachly, C. H.; Ravner, H.

doi:10.21236/ad0609888

Cited by 18 publications

(21 citation statements)

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“…Experiments from the 1960s, performed by the U.S. Department of the Navy, identified EDTA as an additive to stabilize MEA solutions to oxidative degradation. 10,42,43 These studies also identified bicine as a stabilizer, but it was much less effective. Previous studies in this research group confirmed these findings and found that EDTA was the most effective chelating agent for both Fe and Cu.…”

Section: O 2 Scavengers and Reaction Inhibitors Inhibitor Amentioning

confidence: 99%

Oxidation Inhibitors for Copper and Iron Catalyzed Degradation of Monoethanolamine in CO₂ Capture Processes

Goff

Rochelle

2005

Ind. Eng. Chem. Res.

162

146

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This study examines the effect of a number of additives on the oxidative degradation of monoethanolamine (MEA) in the presence of dissolved Cu. Additives were selected from three categories: O 2 scavengers and reaction inhibitors, chelating agents, and stable salts. Three proprietary inhibitors have been identified that significantly inhibit the rate of degradation at concentrations below 100 mM. Inhibitor A is a stable compound, while Scavengers B and C are stoichiometrically degraded to products that must be removed in an industrial application. Hydroquinone, ascorbic acid, manganese sulfate, and potassium permanganate all increased the rate of oxidative degradation. EDTA (ethylene-diamine-tetraacetic acid) was an effective chelating agent but lost inhibiting capacity over time. Phosphate was a weak chelating agent. Heat stable salts, including potassium chloride, potassium bromide, and potassium formate, were also ineffective oxidation inhibitors. Potassium formate was the strongest of the stable salts tested and decreased degradation by 15% at 0.55 M.

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Section: O 2 Scavengers and Reaction Inhibitors Inhibitor Amentioning

confidence: 99%

Oxidation Inhibitors for Copper and Iron Catalyzed Degradation of Monoethanolamine in CO₂ Capture Processes

Goff

Rochelle

2005

Ind. Eng. Chem. Res.

162

146

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“…Kindrick et al , measured oxidation of 2.5 N MEA with 0.5 atm of O 2 and 0.5 atm of CO 2 at 80 °C for 7 days by titrating the effluent for NH 3 at the end of the experiment. Blachly and Ravner sparged 4 N MEA with air at 55 °C, and both NH 3 and peroxide production rates were measured by titration every day for about a week. Rooney et al sparged 20 wt % MEA with air at 80 °C for 28 days, and anions such as acetate, formate, and glycolate were measured every 7 days.…”

Section: Introductionmentioning

confidence: 99%

Oxidative Degradation of Monoethanolamine

Chi

Rochelle

2002

Ind. Eng. Chem. Res.

273

250

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Oxidative degradation of monoethanolamine (MEA) was studied at 55 °C, typical of absorbers for CO2 removal from flue gas. The rate of evolution of NH3, which was indicative of the overall rate of degradation, was measured continuously in a batch system sparged with air. Dissolved iron from 0.0001 to 1 mM yielded oxidation rates from 0.37 to 2 mM/h in MEA solutions loaded with 0.4 mol CO2/mol MEA. Ethylenediaminetetraacetic acid (EDTA) and N,N-bis(2-hydroxyethyl)glycine effectively decreased the rate of oxidation in the presence of iron by 40−50%. Ferrous caused oxidation in unloaded MEA with stoichiometry from 0.1 to 0.33 mol NH3/mol Fe2+. Fe2+ from 0.0001 to 3.2 mM yielded rates from 0.12 to 1.1 mM/h. Ferric did not appear to catalyze oxidation in unloaded MEA.

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“…Finally, the influence of metal ions on MEA oxidative degradation has been previously demonstrated by Blachly and Ravner, so that metal concentrations have been measured in all degradation experiments. While usual experiments at 400 and 600 rpm lead to metal ions concentrations in the range of 5 ppm, it appeared that experiments performed at 1000 rpm in the O 2 ‐N 2 system and 1380 rpm in the O 2 ‐CO 2 ‐N 2 system give a final metal ion concentration of about 25 and 50 ppm respectively (total metal concentration based on the measurement of iron, chromium, nickel and manganese concentrations).…”

Section: Resultsmentioning

confidence: 98%

Relevance of accelerated conditions for the study of monoethanolamine degradation in post‐combustion CO₂ capture

2014

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Solvent degradation represents one of the main operational drawbacks of the post-combustion CO 2 capture process. Degradation not only induces additional costs for solvent make-up, it also impacts the process efficiency and its environmental penalty due to the emission of various degradation products. There is still a gap of knowledge about the influence of process operating conditions on degradation, making it currently impossible to predict the solvent degradation rate in CO 2 capture plants. Morever, the reaction mechanisms corresponding to solvent degradation are very slow, significantly complicating its study in industrial units. In the present work, appropriate experimental equipment and analytical methods are developed for accelerating the degradation of monoethanolamine solvents (MEA). The relevance of accelerated conditions is established by comparing artificially degraded solvent samples with degraded solvent samples from industrial CO 2 capture pilot plants. Two approaches are evaluated implying either discontinuous or continuous gas feed, this latest being the most representative of industrial degradation. The respective influences of the gas feed composition and the gas-liquid transfer are evidenced and quantified. Finally, the present study leads to a better understanding of solvent degradation in the CO 2 capture process with MEA. More generally, it also evidences that accelerated conditions at laboratory-scale may provide relevant information for the study of slow phenomena taking place in large-scale industrial processes. Further works include the development of a kinetic model for MEA solvent degradation and the extension of this methodology to other promising solvents in order to facilitate the operation and large-scale deployment of CO 2 capture.

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The Stabilization of Monoethanolamine Solutions for Submarine Carbon Dioxide Scrubbers

Cited by 18 publications

References 0 publications

Oxidation Inhibitors for Copper and Iron Catalyzed Degradation of Monoethanolamine in CO₂ Capture Processes

Oxidation Inhibitors for Copper and Iron Catalyzed Degradation of Monoethanolamine in CO₂ Capture Processes

Oxidative Degradation of Monoethanolamine

Relevance of accelerated conditions for the study of monoethanolamine degradation in post‐combustion CO₂ capture

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The Stabilization of Monoethanolamine Solutions for Submarine Carbon Dioxide Scrubbers

Cited by 18 publications

References 0 publications

Oxidation Inhibitors for Copper and Iron Catalyzed Degradation of Monoethanolamine in CO2 Capture Processes

Oxidation Inhibitors for Copper and Iron Catalyzed Degradation of Monoethanolamine in CO2 Capture Processes

Oxidative Degradation of Monoethanolamine

Relevance of accelerated conditions for the study of monoethanolamine degradation in post‐combustion CO2 capture

Contact Info

Product

Resources

About

Oxidation Inhibitors for Copper and Iron Catalyzed Degradation of Monoethanolamine in CO₂ Capture Processes

Oxidation Inhibitors for Copper and Iron Catalyzed Degradation of Monoethanolamine in CO₂ Capture Processes

Relevance of accelerated conditions for the study of monoethanolamine degradation in post‐combustion CO₂ capture