Absorption Behavior of Acid Gases in Protic Ionic Liquid/Alkanolamine Binary Mixtures

Akhmetshina, Alsu I.; Petukhov, Anton N.; Vorotyntsev, Andrey V.; Nyuchev, Alexander V.; Воротынцев, И. В.

doi:10.1021/acssuschemeng.7b00092

Cited by 41 publications

(24 citation statements)

References 53 publications

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“…Further, bmim[doc] predicted data were compared to those of bmim[BF 4 ] and bmim[acetate]. As suggested in the literature [ 38 , 39 , 40 ], the anion change has a more pronounced effect on gases solubility. The variation in Henry’s law constants when replacing [doc] anion by [BF 4 ] and [acetate] anions are larger.…”

Section: Resultsmentioning

confidence: 99%

Acidic Gases Solubility in Bis(2-Ethylhexyl) Sulfosuccinate Based Ionic Liquids Using the Predictive Thermodynamic Model

et al. 2020

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To properly design ionic liquids (ILs) adopted for gases separation uses, a knowledge of ILs thermodynamic properties as well their solubilities with the gases is essential. In the present article, solubilities of CO2 and H2S in bis(2-Ethylhexyl)sulfosuccinate based ILs were predicted using the conductor like screening model for real solvents COSMO-RS. According to COSMO-RS calculations, the influence of the cation change was extensively analyzed. The obtained data are used for the prediction of adequate solvent candidates. Moreover, to understand the intrinsic behavior of gases solubility the free volume of the chosen ILs and their molecular interactions with respectively CO2 and H2S were computed. The results suggest that hydrogen bonding interactions in ILs and between ILs and the gases have a pivotal influence on the solubility.

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Section: Resultsmentioning

confidence: 99%

Acidic Gases Solubility in Bis(2-Ethylhexyl) Sulfosuccinate Based Ionic Liquids Using the Predictive Thermodynamic Model

et al. 2020

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“…It was found that the CO 2 and H 2 S mass solubilities do not change appreciably by varying the IL concentration. Additionally, Akhmetshina and coworkers (2017) [118] studied the absorption of H 2 S and CO 2 by 2-hydroxyethylammonium (MEA) or triethanolammonium cations and residues of 2-hydroxy-5-sulfobenzoic acid or pyridine-3-carboxylic acid at various temperatures and partial gases pressures. Results prove that absorbents based on the 2-hydroxyethylammonium cation performed high absorption properties toward the H 2 S. The results of thermal desorption analysis demonstrate that the capture of acid gases in MEA-based absorbents occurred at two stages: through the dissolution in MEA component and in protic ionic liquid.…”

Section: Co 2 Capturementioning

confidence: 99%

New Solvents for CO2 and H2S Removal from Gaseous Streams

et al. 2021

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Acid gas removal from gaseous streams such as flue gas, natural gas and biogas is mainly performed by chemical absorption with amines, but the process is highly energy intensive and can generate emissions of harmful compounds to the atmosphere. Considering the emerging interest in carbon capture, mainly associated with increasing environmental concerns, there is much current effort to develop innovative solvents able to lower the energy and environmental impact of the acid gas removal processes. To be competitive, the new blends must show a CO2 uptake capacity comparable to the one of the traditional MEA benchmark solution. In this work, a review of the state of the art of attractive solvents alternative to the traditional MEA amine blend for acid gas removal is presented. These novel solvents are classified into three main classes: biphasic blends—involving the formation of two liquid phases, water-lean solvents and green solvents. For each solvent, the peculiar features, the level of technological development and the main expected pros and cons are discussed. At the end, a summary on the most promising perspectives and on the major limitations is provided.

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“…The idea of mixing ionic liquids with amine solutions provides relatively lower cost and lower partial pressures compared with the conventional acid gas removal process using amine solutions [30]. The mixture of [bmim][Br] and MDEA creates functionalized ionic liquids with a free tertiary amine group tethered on the cations of the ionic liquids.…”

Section: Gas Absorption In Mixture Of [Bmim][br] Ionic Liquid and Mdeamentioning

confidence: 99%

H2S–CO2 gas separation with ionic liquids on low ratio of H2S/CO2

Adhi¹,

Situmorang²,

Winoto³

et al. 2021

Heliyon

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Acid gas removal, especially H 2 S and CO 2 , is an essential process in natural gas processing. In this research, 1butyl-3-methylimidazolium bromide [bmim][Br] ionic liquid was analyzed as a hydrophobic solvent with has high selectivity to H 2 S as an environmentally friendly solvent to absorb acid gas from natural gas with low H 2 S/ CO 2 concentration in ambient temperature and pressure. The absorption performance of pure [bmim][Br] ionic liquid was compared with various amine solutions, such as monoethanolamine (MEA), triethanolamine (TEA), and methyldiethanolamine (MDEA), as well as the mixture of [bmim][Br]-MDEA with various concentration. As a result, pure [bmim][Br] ionic liquid had high selectivity to H 2 S compared with conventional amine solutions. In addition, the mixture of [bmim][Br]-MDEA with the mass ratio of 1:3 provided the highest H 2 S/CO 2 selectivity of 6.2 in certain absorption conditions due to free tertiary amine attached in the cations of ionic liquids that can attract more H 2 S to its functional site.

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Absorption Behavior of Acid Gases in Protic Ionic Liquid/Alkanolamine Binary Mixtures

Cited by 41 publications

References 53 publications

Acidic Gases Solubility in Bis(2-Ethylhexyl) Sulfosuccinate Based Ionic Liquids Using the Predictive Thermodynamic Model

Acidic Gases Solubility in Bis(2-Ethylhexyl) Sulfosuccinate Based Ionic Liquids Using the Predictive Thermodynamic Model

New Solvents for CO2 and H2S Removal from Gaseous Streams

H2S–CO2 gas separation with ionic liquids on low ratio of H2S/CO2

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