Properties of aqueous solutions of ammonium-based ionic liquids and thermodynamic modelling using Flory theory

Santos, Dheiver; Lourenço, Éverton; Santos, Maria de Fátima Costa; Santos, João Paulo; Franceschi, Elton; Barison, Andersson; Mattedi, Silvana

doi:10.1016/j.molliq.2016.12.084

Cited by 10 publications

(14 citation statements)

References 46 publications

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“…These results show an anomalous behavior when compared to regular liquids, once the effect of ionic interactions is more important than system dilatation because of the molecular free path associated to kinetic energy. For both systems, it was observed that there was a minimum (or maximum) value for V E , around x ≈ 0.58 . These results confirm the relevant effect of steric factors in the behavior of excess volume with molecules with shapes closer to spheres leading to better molecular packing and to a larger value (in absolute) of V E …”

Section: Resultssupporting

confidence: 69%

“…For both systems, it was observed that there was a minimum (or maximum) value for V E , around x≈ 0.58. 37 These results confirm the relevant effect of steric factors in the behavior of excess volume with molecules with shapes closer to spheres leading to better molecular packing and to a larger value (in absolute) of V E . 26 As reported by Kinart et al, 38 4 depicts the parameters found for eq 3 of each system.…”

Section: Surface Tension Measurementssupporting

confidence: 73%

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Binary Mixture of Double Protic Ionic Liquid: Density, Viscosity, Refractive Index, Surface Tension, and Derivative Properties

et al. 2021

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This work presents density (ρ), dynamic viscosity (η), refractive index (n D ), and surface tension (γ) experimental data for three pure protic ionic liquids: 2-hydroxyethylammonium acetate ([2-HEA][Ac]), bis(2-hydroxyethyl)ammonium acetate ([BHEA][Ac]), and bis(2 hydroxyethyl)ammonium butyric ([BHEA][Bu]), along with experimental data for two binary systems, as follows: ([2-HEA][Ac] + [BHEA][Ac]) and ([2-HEA][Ac] + [BHEA][Bu]), at a temperature range of T = 278.15 to 343.15 K and atmospheric pressure (101.3 kPa). For the ([2-HEA][Ac] + [BHEA][Ac]) binary system, excess volume and refractive index deviation values are negative, while for the ([2-HEA][Ac] + [BHEA][Bu]) binary system are positive. For the first, there is a volume contraction, with higher probability of ion interactions. For the latter system, an expansive trend and lower ion interactions were found when compared to the ([2-HEA][Ac] + [BHEA][Ac]) system. Viscosity deviations values show a negative behavior for both binary systems studied. These results could indicate the predominance of dispersive forces. Furthermore, for the [2-HEA][Ac] + [BHEA][Ac] system, surface tension deviation values are positive. On the other hand, for the [2-HEA][Ac] + [BHEA][Bu] system this derivative property are negative. From these results, the [2-HEA][Ac] + [BHEA][Ac] binary system could be characterized by presenting prevalent dispersion forces and an unequal distribution of the mixture components between the bulk and interface.

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Section: Resultssupporting

confidence: 69%

Section: Surface Tension Measurementssupporting

confidence: 73%

Binary Mixture of Double Protic Ionic Liquid: Density, Viscosity, Refractive Index, Surface Tension, and Derivative Properties

et al. 2021

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“…For a clearer understanding of how the intermolecular interactions of two components influence their applications, many researchers have studied different parameters that are relevant to ILs [10]. The Flory–Huggins interaction parameter (χ12) is a vital tool that is used to predict the thermodynamic state of ILs and select suitable solvents [11]. The Hildebrand solubility parameter (δ2) is a physical and chemical parameter that is inherent to a substance, which is commonly used in the formulation design, chemical additive distribution, solvent selection, and system stability studies and membrane penetration [12,13].…”

Section: Introductionmentioning

confidence: 99%

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CnC1im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter

Zhu

Wang

et al. 2019

Molecules

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The physicochemical properties of four 1-alkyl-3-methylimidazolium bromide ([CnC1im]Br, n = 5, 6, 7, 8) ionic liquids (ILs) were investigated in this work by using inverse gas chromatography (IGC) from 303.15 K to 343.15 K. Twenty-eight organic solvents were used to obtain the physicochemical properties between each IL and solvent via the IGC method, including the specific retention volume and the Flory–Huggins interaction parameter. The Hildebrand solubility parameters of the four [CnC1im]Br ILs were determined by linear extrapolation to be δ 2 ( [ C 5 C 1 im ] Br ) = 25.78 (J·cm−3)0.5, δ 2 ( [ C 6 C 1 im ] Br ) = 25.38 (J·cm−3)0.5, δ 2 ( [ C 7 C 1 im ] Br ) =24.78 (J·cm−3)0.5 and δ 2 ( [ C 8 C 1 im ] Br ) = 24.23 (J·cm−3)0.5 at room temperature (298.15 K). At the same time, the Hansen solubility parameters of the four [CnC1im]Br ILs were simulated by using the Hansen Solubility Parameter in Practice (HSPiP) at room temperature (298.15 K). The results were as follows: δ t ( [ C 5 C 1 im ] Br ) = 25.86 (J·cm−3)0.5, δ t ( [ C 6 C 1 im ] Br ) = 25.39 (J·cm−3)0.5, δ t ( [ C 7 C 1 im ] Br ) = 24.81 (J·cm−3)0.5 and δ t ( [ C 8 C 1 im ] Br ) = 24.33 (J·cm−3)0.5. These values were slightly higher than those obtained by the IGC method, but they only exhibited small errors, covering a range of 0.01 to 0.1 (J·cm−3)0.5. In addition, the miscibility between the IL and the probe was evaluated by IGC, and it exhibited a basic agreement with the HSPiP. This study confirms that the combination of the two methods can accurately calculate solubility parameters and select solvents.

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“…The N -methyl-2-hydroxyethylammonium [m-2HEA] + (Figure e) cation was chosen for combining with the propionate anion [m-2HEA][Pr], being, perhaps, the most studied alkanolamine-/carboxylic acid-based IL. Therefore, there is more available information about this IL regarding CO 2 solubility, selectivity, , toxicity, thermal stability, and physical properties. , …”

Section: Resultsmentioning

confidence: 99%

“…Therefore, there is more available information about this IL regarding CO 2 solubility, 51 selectivity, 33,35 toxicity, 37 thermal stability, 40 and physical properties. 53,54 Diethylammonium butanoate [DEA][Bu] (Figure 2c,i) was the second IL selected. This IL is not based on alkanolamine As the selected amine-/carboxylic acid-based ILs show high polarity 33,51 and hygroscopic properties, 55 polymers with similar properties may promote suitable interactions with these ILs.…”

Section: Methodsmentioning

confidence: 99%

Amine/Carboxylic Acid Ionic Liquid Composite Membranes for CO₂ Separation

Alcântara

Oliveira

Lião

et al. 2021

Ind. Eng. Chem. Res.

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Alkanolamine + carboxylic acid-based ionic liquids have shown promising high CO 2 selectivities. Their addition to cellulose acetate (CA) and polyvinyl alcohol (PVA) was investigated in the present study. The N-methyl-2-hydroxyethylammonium propionate IL [m-2HEA][Pr] significantly enhances the CO 2 separation performance of PVA. Scanning electron microscopy, Fourier transform infrared spectroscopy, and nuclear magnetic resonance analyses indicate that the IL−PVA combination produced IL composite membranes with interactions being predominantly physical. Furthermore, the IL addition to CA produced porous membranes with apparent low CO 2 separation efficiency. Pure gas permeation experiments indicate that increasing IL concentration of PVA-based membranes promotes higher gas permeabilities. The membranes were prepared containing up to 60.3 wt % of [m-2HEA][Pr], which resisted pressure differentials up to 6 barg. PVA containing 45.5 wt % of IL produced the most promising results, achieving 26 barrer of CO 2 permeability and permselectivities of 122 and 213 for CO 2 /CH 4 and CO 2 /N 2 , respectively. This result was compared to promising materials from the literature and indicated the overall high CO 2 /CH 4 and CO 2 / N 2 selectivities of PVA/[m-2HEA][Pr] membranes, which overcome even the 2008 Robeson's upper boundary.

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Properties of aqueous solutions of ammonium-based ionic liquids and thermodynamic modelling using Flory theory

Cited by 10 publications

References 46 publications

Binary Mixture of Double Protic Ionic Liquid: Density, Viscosity, Refractive Index, Surface Tension, and Derivative Properties

Binary Mixture of Double Protic Ionic Liquid: Density, Viscosity, Refractive Index, Surface Tension, and Derivative Properties

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CnC1im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter

Amine/Carboxylic Acid Ionic Liquid Composite Membranes for CO₂ Separation

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Properties of aqueous solutions of ammonium-based ionic liquids and thermodynamic modelling using Flory theory

Cited by 10 publications

References 46 publications

Binary Mixture of Double Protic Ionic Liquid: Density, Viscosity, Refractive Index, Surface Tension, and Derivative Properties

Binary Mixture of Double Protic Ionic Liquid: Density, Viscosity, Refractive Index, Surface Tension, and Derivative Properties

Practical Determination of the Solubility Parameters of 1-Alkyl-3-methylimidazolium Bromide ([CnC1im]Br, n = 5, 6, 7, 8) Ionic Liquids by Inverse Gas Chromatography and the Hansen Solubility Parameter

Amine/Carboxylic Acid Ionic Liquid Composite Membranes for CO2 Separation

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Product

Resources

About

Amine/Carboxylic Acid Ionic Liquid Composite Membranes for CO₂ Separation