Measurement and prediction of oxygen solubility in post-combustion CO2 capture solvents

Buvik, Vanja; Bernhardsen, Ida Mortensen; Figueiredo, Roberta Veronezi; Vevelstad, Solrun Johanne; Goetheer, Earl; Os, Peter van; Knuutila, Hanna

doi:10.1016/j.ijggc.2020.103205

Cited by 12 publications

(6 citation statements)

References 35 publications

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“…( 19)-( 20)). Thus, carbonates and bicarbonates can be reused for pH control, and the CO 2 produced can increase the conductivity of the solution and enhance electron transfer (Buvik et al, 2021). Since CO 2 produced could be utilized by BES in-situ, the emission of the greenhouse gas from the wastewater treatment process is controlled.…”

Section: Role Of Buffers and Their By-productsmentioning

confidence: 99%

Bioelectrochemical systems for enhanced nitrogen removal with minimal greenhouse gas emission from carbon-deficient wastewater: A review

Liu

Song

et al. 2023

Science of The Total Environment

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Section: Role Of Buffers and Their By-productsmentioning

confidence: 99%

Bioelectrochemical systems for enhanced nitrogen removal with minimal greenhouse gas emission from carbon-deficient wastewater: A review

Liu

Song

et al. 2023

Science of The Total Environment

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“…Loading is kept constant, meaning that CO 2 concentration increases with the initial amine concentration. Part of the explanation for higher stability at higher initial amine concentration could result from lower oxygen solubility since there will be higher amounts of ionic components in the solution …”

Section: Resultsmentioning

confidence: 99%

“…Part of the explanation for higher stability at higher initial amine concentration could result from lower oxygen solubility since there will be higher amounts of ionic components in the solution. 32 Figures 7−9 show the concentration (mmol/L) as a function of time (h) for HPF, OZN, AP-urea, HPAla, APAP, and HPGly. The major component among these under these conditions was HPF.…”

Section: Degradation Compounds In Experiments With 96% O 2 (Setup 2)mentioning

confidence: 99%

Chemical Stability and Characterization of Degradation Products of Blends of 1-(2-Hydroxyethyl)pyrrolidine and 3-Amino-1-propanol

Vevelstad

Grimstvedt

François³

et al. 2022

Ind. Eng. Chem. Res.

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Aqueous amine solvents are used to capture CO2 from various flue gas sources. In this work, the chemical stability of a blend of 3-amino-1-propanol (3A1P) and 1-(2-hydroxyethyl)pyrrolidine [1-(2HE)PRLD] was studied. The chemical stability tests were conducted both in batch and cycled systems using various oxygen and NOx concentrations, additives (iron), and temperatures. In the thermal degradation experiments with CO2 present, the blend was more stable than the primary amines [(3A1P or monoethanolamine (MEA)] but less stable than the tertiary amine 1-(2HE)PRLD alone. Similar stability was observed between MEA, 3A1P, and the blend in the batch experiments at medium oxygen concentration (21% O2) and no iron present. 1-(2HE)PRLD was more stable. However, the presence of high oxygen concentration (96% O2) and iron reduced the stability of 1-(2HE)PRLD significantly. Furthermore, in the case of the blend, the chemical stability increased with increasing promoter concentration in batch experiments. During the cyclic experiment, the amine loss for the blend was similar to what was previously observed for MEA (30 wt %) under the same conditions. A thorough mapping of degradation compounds in the solvent and condensate samples resulted in the identification and quantification of 30 degradation compounds. The major components in batch and cycled experiments varied somewhat, as expected. In the cyclic experiments, the major components were ammonia, 3-(methylamino)-1-propanol (methyl-AP), N,N′-bis(3-hydroxypropyl)-urea (AP-urea), pyrrolidine, formic acid (formate), and N-(3-hydroxypropyl)-glycine (HPGly). Finally, in this paper, formation pathways for the eight degradation compounds (1,3-oxazinan-2-one, AP-urea, 3-[(3-aminopropyl)amino]-1-propanol, tetrahydro-1-(3-hydroxypropyl)-2(1H)-pyrimidinone, methyl-AP, N-(3-hydroxypropyl)-formamide, N-(3-hydroxypropyl)-β-alanine, and HPGly) are suggested.

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“…Therefore, mass transfer resistances have been approximated and accounted for during the development of the degradation mode. 25 The oxygen solubility model by Buvik et al 37 is used in this work. This novel solubility model considers the effects of temperature and concentration of ionic species in the solvent and thus accounts for reduced solubilities in CO 2 -loaded solvents.…”

Section: Oxidative Degradationmentioning

confidence: 99%

Monoethanolamine Degradation Rates in Post-combustion CO₂ Capture Plants with the Capture of 100% of the Added CO₂

Mullen,

Braakhuis,

Knuutila

et al. 2024

Ind. Eng. Chem. Res.

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Residual emissions from post-combustion CO 2 capture plants must be reduced to zero or recaptured from the atmosphere to be compatible with long-term climate change goals. For amine-based CO 2 capture, increasing CO 2 capture fractions requires maintaining sufficient driving force of absorption at the top of the absorber column by reducing lean solvent loadings. To produce low lean loadings without excessively increasing the specific thermal energy input, increased operational pressures are required in the CO 2 stripper, inevitably leading to higher temperatures, which may increase the specific thermal degradation rate of the solvent. Concurrently, for solvents that react rapidly with dissolved O 2 , increased residence time in the absorber due to the increased packing heights also associated with high capture fractions may increase the specific oxidative degradation rate as the direct contact with O 2 in the flue gas is extended. Through process modeling and the application of a newly developed monoethanolamine (MEA) degradation framework, we investigate the effect on solvent degradation rates of increasing CO 2 capture rates up to those that result in no net CO 2 addition to the atmosphere. We do this for three key energy-producing processes: a combined cycle gas turbine, an energy from waste facility, and a steam methane reformer. In a first-of-a-kind study, we demonstrate that for a 35 wt % MEA-based solvent under steady-state conditions, solvent degradation is predicted to increase by 24−138% as a result of decreasing lean loadings and increased absorber residence time (process modifications that are thought to be beneficial when increasing CO 2 capture fractions) from 53 to 208 gMEA/tCO 2 when a 95% CO 2 gross capture fraction is achieved to 125−257 gMEA/tCO 2 when 99.2−99.8% is achieved (i.e., when 100% of the added CO 2 is captured). Further analysis provides evidence that process modifications, such as intercooling of the absorber column and reduced stripper sump residence times, may be useful in reducing the rates of solvent degradation, providing critical insights to future test campaigns and project developments. However, limitations of this study remain; the degradation framework provides the instantaneous predicted MEA consumption rate of the system at a point in time and does not consider the catalytic effects that many impurities present in an operation plant will have on the reactions, potentially impacting degradation rates. Nonetheless, this serves as the first step toward understanding the effect of increasing CO 2 capture fractions in post-combustion CO 2 capture plants. Long-term tests with appropriate solvent management practices are required to fully quantify solvent degradation rates when operating at 100% added CO 2 capture fractions.

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Measurement and prediction of oxygen solubility in post-combustion CO2 capture solvents

Cited by 12 publications

References 35 publications

Bioelectrochemical systems for enhanced nitrogen removal with minimal greenhouse gas emission from carbon-deficient wastewater: A review

Bioelectrochemical systems for enhanced nitrogen removal with minimal greenhouse gas emission from carbon-deficient wastewater: A review

Chemical Stability and Characterization of Degradation Products of Blends of 1-(2-Hydroxyethyl)pyrrolidine and 3-Amino-1-propanol

Monoethanolamine Degradation Rates in Post-combustion CO₂ Capture Plants with the Capture of 100% of the Added CO₂

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Measurement and prediction of oxygen solubility in post-combustion CO2 capture solvents

Cited by 12 publications

References 35 publications

Bioelectrochemical systems for enhanced nitrogen removal with minimal greenhouse gas emission from carbon-deficient wastewater: A review

Bioelectrochemical systems for enhanced nitrogen removal with minimal greenhouse gas emission from carbon-deficient wastewater: A review

Chemical Stability and Characterization of Degradation Products of Blends of 1-(2-Hydroxyethyl)pyrrolidine and 3-Amino-1-propanol

Monoethanolamine Degradation Rates in Post-combustion CO2 Capture Plants with the Capture of 100% of the Added CO2

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Product

Resources

About

Monoethanolamine Degradation Rates in Post-combustion CO₂ Capture Plants with the Capture of 100% of the Added CO₂