Towards the potential of absorbing pervaporation based on ionic liquids for gas mixture separation

Воротынцев, И. В.; Atlaskin, Artem A.; Trubyanov, Maxim M.; Petukhov, Anton N.; Gumerova, Olesya R.; Akhmetshina, Alsu I.; Воротынцев, В. М.

doi:10.5004/dwt.2017.20400

Cited by 22 publications

(7 citation statements)

References 69 publications

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“…For the synthesis of the taurate or acetate ammonium salts, anion-exchange reactions using an activated free base anion exchange resin (Amberlyst ® A21) were carried out. The resin's activation proceeded as follows [21]: a weighed portion of Amberlyst A21 resin (10 g) was washed with a 10% mass of an aqueous solution of hydrochloric acid (50 g) 5 times using an ion exchanger with a porous filter. Afterward, To obtain bis(2-hydroxyethyl)dimethylammonium hydroxide 30% of the mass, an aqueous solution of bis(2-hydroxyethyl)dimethylammonium chloride was passed through a column with an OH − ion-exchange resin.…”

Section: Synthesis Proceduresmentioning

confidence: 99%

“…A novel and unique hybrid method-membrane-assisted gas absorption (MAGA)-provides the separation without a phase transition in the single-volume massexchange apparatus and does not require heat supply or removal [18,19]. The application of liquid sorbents in that process increases the selectivity; meanwhile, the gas separation membrane provides regeneration of the sorbent in a continuous steady-state mode [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Comprehensive Study of Quaternary-Ammonium-Based Sorbents for Natural Gas Sweetening

et al. 2021

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The present study provides a solvent-free organic synthesis of quaternary ammonium salts: bis(2-hydroxyethyl)dimethylammonium taurate ([BHEDMA][Tau]) and bis(2-hydroxyethyl)dimethylammonium acetate ([BHEDMA][OAc]). These ionic compounds are promising materials for carbon dioxide capture processes, as mono sorbents, supplemental components in the conventional process of chemical absorption, and in the combined membrane approach for improving sorption efficiency. The synthesized compounds were characterized by 1H NMR and FT-IR spectroscopies and elemental analysis. Afterward, the sorption properties of the compounds were evaluated using the inverse gas chromatography (IGC) method, and their thermodynamic parameters were calculated in the temperature range of 303.15–333.15 K. The enthalpy change (∆sH) was less than 80 kJ·mol−1, indicated by the physical nature of sorption and also proved by FT-IR. Henry’s law constant in regard to carbon dioxide at 303.15 K was equal to 4.76 MPa for [BHEDMA][Tau], being almost 2.5 lower than for [BHEDMA][OAc] (11.55 MPa). The calculated carbon dioxide sorption capacity for [BHEDMA][Tau] and [BHEDMA][OAc] amounted to 0.58 and 0.30 mmol·g−1, respectively. The obtained parameters are comparable with the known solid sorbents and ionic liquids used for CO2 capture. However, the synthesized compounds, combining the advantages of both alkanolamines and ionic liquids, contain no fluorine in their structure and thus match the principles of environmental care.

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Section: Synthesis Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Comprehensive Study of Quaternary-Ammonium-Based Sorbents for Natural Gas Sweetening

et al. 2021

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“…This technology has some disadvantages, such as the high energy demand for liquid reuse, as well as solvent loss and degradation [ 1 ]. Regarding this, there have been in recent years increasing interest in acid gas separation using membrane technology, which is more economically viable and energy efficient [ 2 , 3 , 4 ]. The class of membranes, represented by ionic liquids (ILs) or their polymeric derivatives, revealed excellent promises toward acid gas separation characteristics, and the ratio of ideal selectivity to permeability were above the Robeson upper-bound [ 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

The Cation Effect on the Free Volume and the Solubility of H2S and CO2 in Ionic Liquids Based on Bis(2-Ethylhexyl) Sulfosuccinate Anion

et al. 2023

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Herein, we report for the first time a study dedicated to acidic gases’ solubility in ionic liquids with sterically hindered bulky anion, namely bis(2-ethylhexyl) sulfosuccinate ([doc]), experimentally evaluated at low pressures. The effect of cation change (imidazolium, pyridinium, and pyrrolidinium) on the thermophysical properties and sorption capacities was also discussed. The densities and the activation energies of the tested ILs exhibited minor differences. Furthermore, the COSMO-RS model was used to predict the free volumes of ILs aiming to investigate its influence on gas solubilities. The conducted calculations have revealed an antibate correlation between the fractional free volume (FFV) and Henry’s law constant. In particular, the lowest FFV in 1-methylimidazolium [doc] corresponded to the minimal sorption and vice versa. In addition, it was shown that the presence of protic cation results in a significant reduction in CO2 and H2S solubilities. In general, the solubility measurement results of the synthesized ILs have shown their superiority compared to fluorinated ILs based on the physical absorption mechanism.

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“…Membrane-assisted gas absorption unit with built-in technological scheme provides selective mass transfer between recycled and feed streams that allows capture of the residual ammonia and sends it back to the refrigeration unit. Previously, the invented membrane-assisted gas absorption unit was studied comprehensively in the context of ammonia capture from binary and ternary gas mixtures and in the acid gases removal applications [ 7 , 8 , 9 , 10 , 11 ]. Moreover, recently, the lab-scale unit based on the flat membrane was tested concerning the most efficient adsorbent in a so-called “closed-mode operation” with a zero retentate [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

An Efficient Technique for Ammonia Capture in the Haber–Bosch Process Loop—Membrane-Assisted Gas Absorption

et al. 2022

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The present study continues the development and enhancement of a highly efficient unique hybrid technique—membrane-assisted gas absorption in designing the separation unit, which provides the improvement in mass-transfer of a target component during the ammonia capture process from a process loop of the Haber–Bosch technological route. In order to minimize the absorbent volume to membrane area ratio, the special separation cell was designed based on a combination of two types of hollow fiber membranes, dense gas separation membrane and porous pervaporation membrane. The separation performance tests were implemented under two sets of conditions, sweeping the bore (permeate) side of a cell with helium and hydrogen-nitrogen mix. For both cases, the membrane-assisted gas absorption cell demonstrated high separation efficiency, and the ammonia concentration in the permeate was never lower than 81 mol%; meanwhile, under the hydrogen-nitrogen bore sweep conditions, the ammonia concentration in the permeate reached 97.5 mol% in a single-step process. Nevertheless, there is a product purity–recovery rate trade-off, which is a typical issue for separation processes.

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Towards the potential of absorbing pervaporation based on ionic liquids for gas mixture separation

Cited by 22 publications

References 69 publications

Synthesis and Comprehensive Study of Quaternary-Ammonium-Based Sorbents for Natural Gas Sweetening

Synthesis and Comprehensive Study of Quaternary-Ammonium-Based Sorbents for Natural Gas Sweetening

The Cation Effect on the Free Volume and the Solubility of H2S and CO2 in Ionic Liquids Based on Bis(2-Ethylhexyl) Sulfosuccinate Anion

An Efficient Technique for Ammonia Capture in the Haber–Bosch Process Loop—Membrane-Assisted Gas Absorption

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