Investigation mechanism of DEA as an activator on aqueous MEA solution for postcombustion CO<sub>2</sub> capture

Liu, Helei; Li, Moxia; Luo, Xiao; Liang, Zhiwu; Idem, Raphael; Tontiwachwuthikul, Paitoon

doi:10.1002/aic.16165

Cited by 49 publications

(65 citation statements)

References 20 publications

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Section: Introductionmentioning

confidence: 99%

“…A recent method of solvent improvement was the application of the “coordinative effect” by blending small amount of MEA into secondary amine (DEA) 16–20 or related blended amine solvents (BEA + AMP) since 2019. Liu 17 . and the author 18 discovered “coordinative effect” of MEA + DEA (RR'NH), which could facilitate CO 2 absorption 17 and desorption 18,19 simultaneouly.…”

Section: Introductionmentioning

confidence: 99%

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Study of “coordinative effect” within bi‐blended amine MEA + AMP and MEA + BEA at 0.1 + 2–0.5 + 2 mol/L with absorption–desorption parameter analyses

Shi

Feng

Yang

et al. 2021

Asia-Pacific J Chem Eng

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The “coordinative effect” was discovered in MEA + DEA bi‐solvents already, and it enhances both CO2 absorption and desorption within MEA + RR'NH simultaneously. A recent study verified strong coordinative effects within MEA + BEA (RR'NH) + AMP tri‐solvents, but whether the coordination was 100% attributed to interaction of MEA + BEA needs to be confirmed. This study investigated the “coordinative effect” separately within MEA + AMP (hindered amine) and MEA + BEA (RR'NH). The CO2 absorption and desorption processes were performed onto MEA + AMP and MEA + BEA (0.1 + 2–0.5 + 2 mol/L) separately. The CO2 absorption–desorption parameters were calculated to evaluate the coordinative effects on a consistent level. Results indicated negligible “coordinative effect” within MEA + AMP but strong coordination within MEA + BEA. Both CO2 absorption and desorption performance of MEA + BEA (0.2 + 2 mol/L) was better than 2.0 mol/L BEA simultaneously. The coordinative effect was optimum within MEA + BEA bi‐solvents at 0.2 + 2 mol/L close to 0.3 + 2 + 2 mol/L of MEA + BEA + AMP tri‐solvents. Based on analysis, carbamate stability and pKa were two main factors that determine negligible–strong coordinative effects between AMP and BEA; different pKa reflected the optimized blending ratios of MEA + DEA (3/7) and MEA + BEA (2/20).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of “coordinative effect” within bi‐blended amine MEA + AMP and MEA + BEA at 0.1 + 2–0.5 + 2 mol/L with absorption–desorption parameter analyses

Shi

Feng

Yang

et al. 2021

Asia-Pacific J Chem Eng

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“…Besides the peaks of the residual BuNH 3 + , there are three new peaks at 42.6, 58.9, and 69.9 ppm. The first of these peaks obviously belongs to the –CH 2 -NH 3 + carbon atom (C1 carbon) [ 73 ]. The corresponding peak of BuNH 3 + has a similar chemical shift.…”

Section: Resultsmentioning

confidence: 99%

“…The signal of the –OC- moiety will be shifted to lower field by about 10 ppm. We conclude that the peak at 58.9 ppm in the spectrum of the monoethanolamine derivative belongs to the C2 carbon of intercalated protonated MEA, HOCH 2 CH 2 NH 3 + [ 73 ]. In contrast, the peak at 69.9 ppm belongs to TiOCH 2 CH 2 NH 3 + residues covalently bound to the inorganic matrix; we denote it as C2*.…”

Section: Resultsmentioning

confidence: 99%

NMR Study of Intercalates and Grafted Organic Derivatives of H2La2Ti3O10

et al. 2020

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The protonated perovskite-like titanate H2La2Ti3O10 has been used to produce organic-inorganic hybrids with simple organic molecules: methylamine, methanol, monoethanolamine, and n-butylamine. The optimal pathways for the preparation of such hybrids are summarized. Solid-state NMR, combined with thermal analysis, Raman, and IR spectroscopy, has been applied to determine the bonding type in the obtained organic-inorganic hybrids. It has been found that, in the methanolic hybrid, the organic residues are covalently bound to the inorganic matrix. In contrast, in the methylamine and n-butylamine hybrids, the organic molecules are intercalated into the inorganic matrix in cationic forms. The structure of the monoethanolamine hybrid is composite and includes both the covalently bound and intercalated organic species.

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“…Nowadays, the chemical absorption method, primarily using amine scrubbing, has been demonstrated to be applicable to existing fuel‐fired power plants with large CO 2 emissions, due to its excellent CO 2 removal efficiency, and ease of scale up . Despite the obvious advantages of amine scrubbing, its wide industrial application and further development have been limited by the remarkable heat demand for regeneration of the amine, which can take up to 60% of the total operating cost in a CO 2 capture process .…”

Section: Introductionmentioning

confidence: 99%

Kinetics and new mechanism study of CO₂ absorption into water and tertiary amine solutions by stopped‐Flow technique

et al. 2018

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The objective of the present work was to find the accurate kinetic models and mechanism for CO2 absorption into tertiary amine solution, aiming at understanding the contribution of the CO2 reaction with H2O, OH−, and tertiary amines on the overall reaction rate. First, the kinetics of CO2 absorption into water instead of a buffer solution were studied using the stopped‐flow technique at 293–313 K, with initial CO2 molar concentration of 1.1–37.3 mM. The experimental first‐order reaction rate constant (k0_CO2) was determined to be about 1000 times larger than the value for CO2 absorption into buffer solution reported in the reference. The k0_CO2 was then correlated by a proposed semiempirical model and a simplified theoretical model, giving the activation energy for CO2 reacting with H2O as fitted by the simplified theoretical model in good agreement with the value of previous research. Also, the pH values and hydroxyl ion concentrations of aqueous Diethylaminoethanol (DEEA) solutions were determined at 293–313 K, with DEEA molar concentration of 0.1–0.4 M and CO2 loading of 0–0.626 mol/mol. In addition, the observed first‐order reaction rate constant ( k0_DEEA) of binary DEEA‐H2O solution with DEEA molar concentration of 0.1–0.4 M reacting with CO2 was determined at 293–313 K. It should be pointed out that the kinetic experiments of CO2 absorption into DEEA solution was done with the molar ratio of DEEA to CO2 fixed at 20. The values of k0_DEEA were then fitted and predicted by four models (i.e., termolecular model, base‐catalyzed model, the improved model, and Khalifah model). The results show the improved model and Khalifah model can predict k0_DEEA well with an average absolute relative difference (AARD) <5%. The predicted results indicate that the contribution of OH− to k0_DEEA cannot be ignored for the absorption of CO2 into tertiary amine solutions, and could be responsible for 50–70% of the total absorption reaction rate. Furthermore, the k0 value of CO2 absorption into aqueous triethanolamine and CO2‐loaded DEEA solution were further investigated and comprehensively discussed, suggesting that both pK a and the CO2 solubility affect k0, with pK a having a much more significant effect. © 2018 American Institute of Chemical Engineers AIChE J, 65: 652–661, 2019

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Investigation mechanism of DEA as an activator on aqueous MEA solution for postcombustion CO₂ capture

Cited by 49 publications

References 20 publications

Study of “coordinative effect” within bi‐blended amine MEA + AMP and MEA + BEA at 0.1 + 2–0.5 + 2 mol/L with absorption–desorption parameter analyses

Study of “coordinative effect” within bi‐blended amine MEA + AMP and MEA + BEA at 0.1 + 2–0.5 + 2 mol/L with absorption–desorption parameter analyses

NMR Study of Intercalates and Grafted Organic Derivatives of H2La2Ti3O10

Kinetics and new mechanism study of CO₂ absorption into water and tertiary amine solutions by stopped‐Flow technique

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Investigation mechanism of DEA as an activator on aqueous MEA solution for postcombustion CO2 capture

Cited by 49 publications

References 20 publications

Study of “coordinative effect” within bi‐blended amine MEA + AMP and MEA + BEA at 0.1 + 2–0.5 + 2 mol/L with absorption–desorption parameter analyses

Study of “coordinative effect” within bi‐blended amine MEA + AMP and MEA + BEA at 0.1 + 2–0.5 + 2 mol/L with absorption–desorption parameter analyses

NMR Study of Intercalates and Grafted Organic Derivatives of H2La2Ti3O10

Kinetics and new mechanism study of CO2 absorption into water and tertiary amine solutions by stopped‐Flow technique

Contact Info

Product

Resources

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Investigation mechanism of DEA as an activator on aqueous MEA solution for postcombustion CO₂ capture

Kinetics and new mechanism study of CO₂ absorption into water and tertiary amine solutions by stopped‐Flow technique