scholarly journals Viscosities and Conductivities of [BMIM]Zn(Ac)xCly(x=0,1,2,3; y=3,2,1,0) Ionic Liquids at Different Temperatures

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Hang Xu ◽  
Dandan Zhang
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Arrhenius Equation ◽  
Correlation Coefficients ◽  
Conductivity Data ◽  
Different Temperatures ◽  
The Relationship

Viscosity and conductivity data of BMIMZnAcxCly(x=0,1,2,3;  y=3,2,1,0) ionic liquids were detected at temperature ranging from 323.15 to 353.15 K with an interval of 5 K. The conductivities of different ionic liquids at the same temperature followed the trend [BMIM][ZnAcCl2] > [BMIM][ZnAc2Cl] > [BMIM][ZnCl3] > [BMIM][ZnAc3]. The viscosities of different ionic liquid abided by the order [BMIM][ZnCl3] > [BMIM][ZnAcCl2] > [BMIM][ZnAc2Cl] > [BMIM][ZnAc3]. Acetate ion could reduce the viscosity of ionic liquids. The relationship between viscosity/conductivity and temperature obeyed the Arrhenius equation and Vogel-Fulcher-Tammann (VFT) equation very well with above 0.99 correlation coefficients.

Molecular dynamics study of mesophase transitions upon annealing of imidazolium-based ionic liquids with long-alkyl chains

2018 ◽  
Vol 20 (15) ◽  
pp. 9796-9805 ◽  
Author(s):  
Hailong Peng ◽  
Momoji Kubo ◽  
Hayato Shiba
Keyword(s):  
Molecular Dynamics ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Alkyl Chains ◽  
Different Temperatures ◽  
Long Time

The isotropic to mesophase transition upon the long-time annealing of a 1-dodecyl-3-methylimidazolium hexafluorophosphate ionic liquid at different temperatures is illustrated.

Preconcentration and Determination of Aromatic Amines with Temperature-Controlled Ionic Liquid Dispersive Liquid Phase Microextraction in Combination with High Performance Liquid Chromatography

2012 ◽  
Vol 95 (5) ◽  
pp. 1534-1540 ◽  
Author(s):  
Qingxiang Zhou ◽  
Yuantuan Gao ◽  
Junping Xiao ◽  
Guohong Xie
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Liquid Phase ◽  
Aromatic Amines ◽  
High Performance ◽  
Correlation Coefficients ◽  
Detection Sensitivity ◽  
Liquid Phase Microextraction ◽  
Temperature Controlled

Abstract This paper reports a new method for the determination of aromatic amines with temperature-controlled ionic liquid dispersive liquid-phase microextraction in combination with HPLC and results of investigation of the influence of anions in ionic liquids on the extraction performance. In these experiments, 1-octyl-3-methylimidazolium hexafluorophosphate ([C8MIM][PF6]), 1-octyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide ([C8MIM][NTf2]), and 1-octyl-3-methylimidazolium tetrafluoroborate ([C8MIM][BF4]) were used as the extraction solvents for the investigation of the effect of anions in ionic liquids. Other parameters affecting the microextraction performance were also investigated. Under the optimal conditions, the proposed method had good linearity over the concentration ranges of 1.0–100 μg/L for 2, 4-dimethylaniline, 2-chloroanline, and N,N-dimethylaniline, and 1.5–150 μg/L for N,N-dimethylaniline and alpha-naphthylamine, with excellent correlation coefficients (R2 ≥ 0.999), excellent detection sensitivity with LODs (S/N = 3) in the range of 0.39–0.63 μg/L, and precision in the range of 3.2–5.4% RSD (n = 6). Real water samples were analyzed with the established method, and good spike recoveries in the range of 86.3 to 98.9% were obtained. These results indicated that this method would be useful in the routine analysis of such pollutants.

scholarly journals Thermo-physical properties and activity coefficients at infinite dilution for ionic liquid systems at several temperatures

2017 ◽  
Author(s):  
◽  
Sangeeta Singh
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Thermodynamic Properties ◽  
Infinite Dilution ◽  
Binary Systems ◽  
Isentropic Compressibility ◽  
Liquid Systems ◽  
Different Temperatures ◽  
Kister Equation ◽  
Deviation In Isentropic Compressibility

The thermodynamic properties of mixtures involving ionic liquids (ILs) with organic acid (acetic acid or propanoic acid) or acetonitrile at different temperatures were determined. The ILs used were imidazolium-based: 1-ethyl-3-methylimidazolium ethyl sulphate [EMIM]+[EtSO4]-, 1-butyl- 3-methylimidazolium thiocyanate [BMIM]+[SCN]- and 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide ([BMIM]+[Tf2N]-. The ternary excess molar volume (V E ), isentropic compressibility (ks) and deviation in isentropic compressibility ( ks123 ) were determined for four ternary liquid mixtures of {[EMIM]+[EtSO4]- or [BMIM]+[SCN]− + acetic or propionic acid + acetonitrile} at different temperatures (293.15, 298.15, 303.15, 308.15 and 313.15) K and at a pressure of 0.1 MPa with aid of the experimental density (ρ), speed of sound (u) data. The calculated data were correlated by using the Cibulka equation with the help of Redlich–Kister parameters obtained from fitting the Redlich–Kister equation for the corresponding binary systems. Furthermore, the density and speed of sound were also measured for eight corresponding binary systems at the same experimental conditions. The binary excess molar volume, isentropic compressibility and deviation in isentropic compressibility were also calculated for measured systems and fitted to the Redlich–Kister equation to obtain the Redlich–Kister parameters as well as to check the accuracy of measured data which were used to correlated experimental data using Cibulka equation. These results were discussed, in terms of how the sign and magnitude of thermodynamic functions were influenced by the addition of a third component to liquid systems. Also, the possible molecular and pair-wise interactions between component molecules and the effect of temperature on the thermophysical and thermodynamic properties were predicted. In addition, the work focussed on application of ([BMIM]+[Tf2N]-) ionic liquid for the separations of (alkane/aromatic), (alkane/alk-1-ene), (cycloalkane/aromatic) and (water/alkan-1-ol) using gas- liquid chromatography (GLC) technique. The activity coefficients at infinite dilution, , for 31 organic solutes (alkanes, cycloalkanes, alkenes, alkynes, aromatics, alkanol and ketones) and water in ionic liquid were measured at temperatures of (323.15, 333.15, 343.15, 353.15 and 363.15) K. Stationary phase loadings of (42.83 and 68.66) % by mass were used to ensure repeatability of E , measurements. Partial molar excess enthalpies at infinite dilution, H1 , were also determined. The selectivities, S , and capacities, k , were determined for the above separations. The separating ij j ability of the investigated ionic liquid was compared with previously investigated ionic liquids and industrial solvents such as sulfolane, n-methyl-2-pyrrolidine (NMP) and n-formylmorpholine (NFM). The results obtained suggested that in general, the [BMIM]+[Tf2N]− had outperformed the conventional solvents such as sulfolane, NMP and NFM in terms of selectivity, while the [BMIM][Tf2N] had in general, performed better overall when the performance index was used for comparison.

Determination and correlation of refractive index of three binary and ternary systems containing hydroxyl ionic liquids/ water/methanol

2020 ◽  
Vol 10 (4) ◽  
pp. 469-478
Author(s):  
Gang Tian ◽  
Cong Yang ◽  
Xiaoxia Li ◽  
Guoxu He ◽  
Xiaojun Zhao ◽  
...  
Keyword(s):  
Refractive Index ◽  
Ionic Liquids ◽  
Mole Fraction ◽  
Ternary Systems ◽  
Different Temperatures ◽  
The Relationship ◽  
Binary And Ternary Systems

In this paper, the refractive index of methanol + water, [HOEMIm]Cl + methanol, [HOEMMIm]Cl + methanol, [OHEN1,1,1]Cl + methanol, [HOEMIm]Cl + water, [OHEN1,1,1]Cl + water, [HOEMMIm]Cl + water, [OHEN1,1]Cl + water, [HOEMIm]Cl + methanol + water, [HOEMMIm]Cl + methanol + water and [OHEN1,1,1]Cl+methanol+water at different temperatures were determined by refractometer. The physical database of hydroxyl ionic liquids was enriched, and the excess refractive index of these systems was obtained by calculation. The relationship between the refractive index or the excess refractive index and the composition mole fraction were established at 20 °C.

Study on the Physicochemical Properties of the Mixture of Water and 1-butyl-3-methylimidazolium Hydrogen Sulfate Salt Ionic Liquids

2014 ◽  
Vol 887-888 ◽  
pp. 643-646
Author(s):  
Guo Cai Tian ◽  
Han Kun Feng
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Atmospheric Pressure ◽  
Arrhenius Equation ◽  
Water Concentration ◽  
Hydrogen Sulfate ◽  
Sulfate Salt ◽  
The Relationship

The density, viscosity, conductivity of the mixture of 1-butyl-3-methylimidazolium hydrogen sulfate salt ([Bmim]HSO4) ionic liquids and water have been determined at 25°C and atmospheric pressure. It was found that the density and conductivity of [Bmim]HSO4/water increase with the increase the water concentration at the same temperature, whereas the viscosity of [Bmim]HSO4/water decreases. The relationship between conductivities and temperature are agreed well with the Arrhenius equation.

scholarly journals Basicity Characterization of Imidazolyl Ionic Liquids and Their Application for Biomass Dissolution

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Chao Liu ◽  
Youming Li ◽  
Yi Hou
Keyword(s):  
Ionic Liquids ◽  
Ionization Constant ◽  
Dissolution Mechanism ◽  
Uv Spectrum ◽  
Different Temperatures ◽  
Biomass Dissolution ◽  
Dissolution Ratio ◽  
The Relationship ◽  
Acid Function

Alkalinity determination is of crucial significance for the applications of basic ionic liquids with imidazolyl. In this work, the ionization constant pKb value and acid function H- values of ionic liquids synthesized were calculated by pH method and UV spectrum-Hammett method. The dissolution ratio of biomass in these ionic liquids was measured at different temperatures. Finally, the relationship between the alkalinity and structure of these ionic liquids was discussed, and the relationship between the alkalinity of ionic liquid and the dissolution mechanism biomass was also discussed. The results show that the basicity of carboxylate ionic liquids is determined mainly by their anions, whereas cations take some finely tuned roles. Furthermore, cations and anions are equally important and are involved in dissolution mechanisms.

Study of Effect of Water on the Physicochemical Properties of 1-Buthyl-3-Methylimidazolium Chloride Ionic Liquids

2012 ◽  
Vol 549 ◽  
pp. 152-156 ◽  
Author(s):  
Guo Cai Tian ◽  
Han Kun Feng ◽  
Jin Liang Zhang
Keyword(s):  
Ionic Liquids ◽  
Physicochemical Properties ◽  
Atmospheric Pressure ◽  
Arrhenius Equation ◽  
Water Concentration ◽  
Water Mixture ◽  
Imidazolium Chloride ◽  
Effect Of Water ◽  
Electrochemical Window ◽  
The Relationship

The density, viscosity, conductivity and the electrochemical window of 1-buthyl-3-methyl- imidazolium Chloride ionic liquids([Bmim]Cl) and its water mixture have been determined at 298.15 K and atmospheric pressure. It was found that the density and conductivity of [Bmim]Cl/water, increase with the increase the water concentration at the same temperature, whereas the viscosity and electrochemical windows of [Bmim]Cl/water decrease. The viscosity of pure ionic liquids decreases with the increase of the temperature, whereas the conductivity increases. The relationship between the conductivity and the temperature agrees well with the Arrhenius equation k=k∞exp[-Ea/kBT] and the active energy of conduction is determined accordingly.

Hydrophilic Ionic Liquids in the Synthesis of Hantzsch Ester

2011 ◽  
Vol 50 (3-4) ◽  
pp. 277-283 ◽  
Author(s):  
S. Pavlovica ◽  
E. Gzibovska ◽  
A. Zicmanis ◽  
P. Mekss ◽  
M. Klavins
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Organic Solvents ◽  
Heterocyclic Compound ◽  
Reaction Rates ◽  
Ester Synthesis ◽  
Low Toxicity ◽  
The Relationship

Hydrophilic Ionic Liquids in the Synthesis of Hantzsch Ester Hantzsch ester synthesis was investigated using (2-hydroxyethyl)-ammonium carboxylates, polar and hydrophilic ionic liquids possessing low toxicity and high biodegradability. The reaction rates and yields of the products in ionic liquids were greater than those in common organic solvents. The relationship between the structure of the ionic liquid used and the structure of the heterocyclic compound was investigated.

scholarly journals Synthesis and Characterization of a Novel Hydroquinone Sulfonate-Based Redox Active Ionic Liquid

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3259
Author(s):  
Farida H. Aidoudi ◽  
Alessandro Sinopoli ◽  
Muthumeenal Arunachalam ◽  
Belabbes Merzougui ◽  
Brahim Aïssa
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
High Stability ◽  
Supporting Electrolyte ◽  
Ionic Species ◽  
Scanning Calorimetry ◽  
Energy Applications ◽  
Redox Active ◽  
Step Procedure ◽  
Different Temperatures

Introducing redox-active moieties into an ionic liquid (IL) structure is an exciting and attractive approach that has received increasing interest over recent years for a various range of energy applications. The so-called redox-active ionic liquids (RAILs) provide a highly versatile platform to potentially create multifunctional electroactive materials. Ionic liquids are molten salts consisting of ionic species, often having a melting point lower than 100 °C. Such liquids are obtained by combining a bulky asymmetric organic cation and a small anion. Here, we report on the synthesis of a novel RAIL, namely 1-butyl-3-methylimidazolium hydroquinone sulfonate ((BMIM)(HQS)). (BMIM)(HQS) was synthesized in a two-step procedure, starting by the quaternization of methylimidazole using butylchloride to produce 1-butyl-3-methylimidazolium chloride ((BMIM)(Cl)), and followed by the anion exchange reaction, where the chloride anion is exchanged with hydroquinone sulfonate. The resulting product was characterized by 1H NMR, 13C NMR, FT-IR spectroscopy, themogravimetric analysis, and differential scanning calorimetry, and shows a high stability up to 340 °C. Its electrochemical behavior was investigated using cyclic voltammetry at different temperatures and its viscosity analysis was also performed at variable temperatures. The electrochemical response of the presented RAIL was found to be temperature dependent and diffusion controlled. Overall, our results demonstrated that (BMIM)(HQS) is redox active and possesses high stability and low volatility, leading to the employment of this RAIL without any additional supporting electrolyte or additives.

Separation of Naphthenic Acid Using Hydroxide Based Ionic Liquids

2014 ◽  
Vol 625 ◽  
pp. 570-573 ◽  
Author(s):  
Syed Nasir Shah ◽  
Mohammed Ibrahim Abdul Mutalib ◽  
Rashidah Binti Mohd Pilus ◽  
Kallidanthiyil Chellappan Lethesh
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Naphthenic Acid ◽  
Liquid Model ◽  
Before And After ◽  
Different Temperatures ◽  
Model Oil

Isolation of naphthenic acid from model oil using hydroxide based ionic liquid was investigated. A detailed de-acidification study at different temperatures and different ionic liquid/model oil was performed and the content of naphthenic acid before and after extraction was calculated. The ILs containing hydroxide anions has the potential to completely deacidify model oil having high TAN with extremely low ionic liquid /oil ratio.

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