Heat of Absorption of CO2 with Aqueous Solutions of MEA: New Experimental Data

Kim, Inna; Hoff, Karl Anders; Mejdell, Thor

doi:10.1016/j.egypro.2014.11.154

Cited by 61 publications

(36 citation statements)

References 10 publications

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“…The same assumption has been used by several authors. 24,25,26 The amount of CO2 in the storage cylinder and the amount of unreacted CO2 in the gas phase in the reactor was calculated from the Peng Robinson equation of state. 27 Vapor-liquid equilibrium (VLE) results obtained in the apparatus at low CO2 pressures (<3 kPa) are considered inaccurate, since two almost equal numbers (with accuracy of 1.5 kPa) are subtracted from each other (total pressurepartial pressure of water and solvent).…”

Section: Heat Of Reaction ∆H Measurementsmentioning

confidence: 99%

New polyalkylated imidazoles tailored for carbon dioxide capture

Evjen

Fiksdahl

Pinto

et al. 2018

International Journal of Greenhouse Gas Control

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Aqueous polyalkylated imidazoles have gained interest as potential CO2 capture solvents due to their high oxidative stability and low vapor pressures compared to traditional amines. In this work, 21 aqueous solutions of polyalkylatedimidazoles were screened as absorbents for CO2 capture and four solvent candidates were further characterized by measuring the vapor-liquid equilibria and the heat of absorption of CO2. The pKa values of the imidazoles were measured and a positive correlation between the absorption capacity and pKa of polyalkylated imidazoles was found. Increasing the pKa of imidazoles to 9 by alkylation improved the CO2 absorption capacity significantly. Based on the equilibrium experiments, the cyclic capacities of the selected solvents varied from 0.8 to 2 mol CO2/kg solvent. Furthermore, the heat of absorption of CO2 of the studied imidazoles was lower compared to primary amines. In general, the tested polyalkylated imidazoles are more feasible for processes with partial pressures of CO2 above 50 kPa. Trimethylimidazole that forms bicarbonate precipitate might be applicable for post combustion CO2 capture as a high cyclic capacity is obtained even at CO2 partial pressures around 10 kPa. The collected data indicates that the absorption rate of imidazoles is comparable to tertiary amines and promoters would most likely be required. The present study gives new important knowledge of the absorption properties of polyalkylated imidazoles.

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Section: Heat Of Reaction ∆H Measurementsmentioning

confidence: 99%

New polyalkylated imidazoles tailored for carbon dioxide capture

Evjen

Fiksdahl

Pinto

et al. 2018

International Journal of Greenhouse Gas Control

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“…For primary amines, e.g. MEA, the heat of reaction is around 83-85 kJ/mol CO2 absorbed (Kim et al, 2014), equivalent of about 2 GJ/ton CO2 energy requirement in a post combustion CO2 capture process.…”

Section: Introductionmentioning

confidence: 99%

Effect of the concentration of MAPA on the heat of absorption of CO 2 and on the cyclic capacity in DEEA-MAPA blends

Knuutila

Nannestad

2017

International Journal of Greenhouse Gas Control

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“…Differential with a small modification given in Kim et al 41 The experiments were initiated by evacuating the reactor to ~0.04 bar. Subsequently, around 1.1 -1.2L of amine solution was fed to the reactor, and the reactor was once again evacuated to degas the solution.…”

Section: Calorimetermentioning

confidence: 99%

Aqueous MAPA, DEEA, and Their Blend as CO₂ Absorbents: Interrelationship between NMR Speciation, pH, and Heat of Absorption Data

Perinu

Bernhardsen

Pinto

et al. 2019

Ind. Eng. Chem. Res.

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Based on NMR speciation, heat of absorption and pH data, the reactions occurring in aqueous MAPA (3-(Methylamino)propylamine), DEEA (2-(Diethylamino)ethanol) and their blend at various carbon dioxide (CO2) loadings were identified and discussed. At increasing CO2 loading, the basicity of the solutions decreased. In the MAPA solvent, this led to the hydrolysis of the carbamate species, which corresponded to a drop in the heat of absorption. In the blend, due to the activity of DEEA, such a drop in both pH and heat of absorption was not noticeable. In the presence of MAPA, in the early loadings DEEA had not

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Heat of Absorption of CO2 with Aqueous Solutions of MEA: New Experimental Data

Cited by 61 publications

References 10 publications

New polyalkylated imidazoles tailored for carbon dioxide capture

New polyalkylated imidazoles tailored for carbon dioxide capture

Effect of the concentration of MAPA on the heat of absorption of CO 2 and on the cyclic capacity in DEEA-MAPA blends

Aqueous MAPA, DEEA, and Their Blend as CO₂ Absorbents: Interrelationship between NMR Speciation, pH, and Heat of Absorption Data

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Heat of Absorption of CO2 with Aqueous Solutions of MEA: New Experimental Data

Cited by 61 publications

References 10 publications

New polyalkylated imidazoles tailored for carbon dioxide capture

New polyalkylated imidazoles tailored for carbon dioxide capture

Effect of the concentration of MAPA on the heat of absorption of CO 2 and on the cyclic capacity in DEEA-MAPA blends

Aqueous MAPA, DEEA, and Their Blend as CO2 Absorbents: Interrelationship between NMR Speciation, pH, and Heat of Absorption Data

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Aqueous MAPA, DEEA, and Their Blend as CO₂ Absorbents: Interrelationship between NMR Speciation, pH, and Heat of Absorption Data