Experimental solubility and thermodynamic modeling of CO2 in four new imidazolium and pyridinium-based ionic liquids

Zoubeik, Mohamed; Mohamedali, Mohanned; Henni, Amr

doi:10.1016/j.fluid.2016.03.009

Cited by 42 publications

(13 citation statements)

References 22 publications

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“…Liquid) model, which has been able to correlate satisfactorily the activity coefficients of different solutes in ILs. 25,44,50,51 Consider the general condition for thermodynamic equilibrium between a pure F-gas, , in the vapor phase and its absorption in an IL:…”

Section: Gas Solubility In Ilsmentioning

confidence: 99%

Absorption of Fluorinated Greenhouse Gases Using Fluorinated Ionic Liquids

Sosa

Ribeiro

Castro

et al. 2019

Ind. Eng. Chem. Res.

133

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The increasing awareness of the environmental impact of fluorinated gases (Fgases) used in refrigeration is instigating the development of technologies to recover and recycle them. With this goal in mind, single-component absorption equilibrium isotherms at 303.15 K of F-gases in different ionic liquids (ILs) were determined using a gravimetric method. The selected F-gases are the most used in domestic refrigeration (R-32: difluoromethane, R-125: pentafluoroethane, and R-134a: 1,1,1,2-tetrafluoroethane). The results show that ILs containing a fluorinated alkyl side chain with four carbon atoms, i.e., fluorinated ionic liquids (FILs), have higher gas absorption capacity than conventional fluoro-containing ILs. All studied ILs showed ideal selectivity towards R-134a. Conventional fluoro-containing ILs showed better selectivities for the separation of the binary mixtures R-134a/R-125 and R-32/R-125 and FILs showed better selectivities for the R-134a/R-32 mixture. These results provide fundamental knowledge of the behavior of these new alternative solvents and key information for their application in the separation of F-gases mixtures of commercial refrigerants.

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Section: Gas Solubility In Ilsmentioning

confidence: 99%

Absorption of Fluorinated Greenhouse Gases Using Fluorinated Ionic Liquids

Sosa

Ribeiro

Castro

et al. 2019

Ind. Eng. Chem. Res.

133

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“…Ionic liquids are used in many applications, such as in chemical reactions and separation processes [3][4][5][6]. In the field of CO 2 capture using ionic liquids, initial work on the CO 2 -ionic liquid system was done in 2001 [7] and, following this discovery, extensive works have been done to explore the absorption of CO 2 in ionic liquids under various operating conditions [8][9][10][11][12][13][14][15]. Imidazolium-based ionic liquids were used in most of the study of CO 2 absorption.…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Properties and CO2 Absorption of Ammonium-Based Protic Ionic Liquids Containing Acetate and Butyrate Anions

et al. 2019

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Ionic liquids, which are classified as new solvents, have been identified to be potential solvents in the application of CO2 capture. In this work, six ammonium-based protic ionic liquids, containing ethanolammonium [EtOHA], tributylammonium [TBA], bis(2-ethylhexyl)ammonium [BEHA] cations, and acetate [AC] and butyrate [BA] anions, were synthesized and characterized. The thermophysical properties of the ammonium-based protic ionic liquids were measured. Density, , and dynamic viscosity, , were determined at temperatures between 293.15 K and 363.15 K. The density and viscosity values were correlated using empirical correlations and the thermal coefficient expansion, p, and molecular volume, Vm, were estimated using density values. The thermal stability of the ammonium-based protic ionic liquids was investigated using thermogravimetric analyzer (TGA) at a heating rate of 10 C.min‒1. The CO2 absorption of the ammonium-based ionic liquids were measured up to 20 bar at 298.15 K. From the experimental results, [BEHA][BA] had the highest affinity towards CO2 with the mol fraction of CO2 absorbed approaching 0.5 at 20 bar. Generally, ionic liquids with butyrate anions have better CO2 absorption than that of acetate anions while [BEHA] ionic liquids have higher affinity towards CO2 followed by [TBA] and [EtOHA] ionic liquids.

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“…Ionic liquids, which are in general a kind of liquid electrolytes composed entirely of ions at room temperature or below 100°C, provoke a wide interest in the scientific community, due to their outstanding characteristics such as negligible vapor pressure, high thermal stability, and tunable chemistry, and so on . During the past decades, scientists have synthesized numerous kinds of ILs, such as those based on imidazolium, ammonium, and amino acid . These ILs have been studied for absorbing CO 2 in detail and some of them have achieved good results.…”

Section: Introductionmentioning

confidence: 99%

Protic ionic liquid as excellent shuttle of MDEA for fast capture of CO₂

Zheng

Huang

et al. 2017

AIChE Journal

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A cheap protic ionic liquid (PIL), 3-(Dimethylamino)-1-propylamine acetate (abbreviated as [DMAPAH][Ac]), is investigated in this work as the activator of N-methyldiethanolamine (MDEA) for fast capture of CO 2 . The PIL-activated MDEA solutions show excellent performance in absorption rate and capacity (!2.5 molÁkg 21 ). A novel absorption mechanism is proposed to account for the phenomenon, where the shuttling role of the PIL is described in detail. Additionally, the enthalpy change DH SOL (245 to 252 kJÁmol 21 ), the turnover number of the PIL and the regeneration efficiency (>92%) are also measured. All these data show that the PIL-mediated MDEA solutions may be used as a kind of promising absorbents for fast capture of CO 2 . Figure 2. Absolute absorption capacity (a) and relative CO 2 loading (moles of CO 2 absorbed by per mole of PIL) (b) of PIL aqueous solutions as a function of the PIL concentration (ٗ: 60 wt %; ᭺: 70 wt %; ᭝: 80 wt %; ᭞: 90 wt %) at T 5 308.15 K.

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Experimental solubility and thermodynamic modeling of CO2 in four new imidazolium and pyridinium-based ionic liquids

Cited by 42 publications

References 22 publications

Absorption of Fluorinated Greenhouse Gases Using Fluorinated Ionic Liquids

Absorption of Fluorinated Greenhouse Gases Using Fluorinated Ionic Liquids

Thermophysical Properties and CO2 Absorption of Ammonium-Based Protic Ionic Liquids Containing Acetate and Butyrate Anions

Protic ionic liquid as excellent shuttle of MDEA for fast capture of CO₂

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Experimental solubility and thermodynamic modeling of CO2 in four new imidazolium and pyridinium-based ionic liquids

Cited by 42 publications

References 22 publications

Absorption of Fluorinated Greenhouse Gases Using Fluorinated Ionic Liquids

Absorption of Fluorinated Greenhouse Gases Using Fluorinated Ionic Liquids

Thermophysical Properties and CO2 Absorption of Ammonium-Based Protic Ionic Liquids Containing Acetate and Butyrate Anions

Protic ionic liquid as excellent shuttle of MDEA for fast capture of CO2

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Product

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Protic ionic liquid as excellent shuttle of MDEA for fast capture of CO₂