The apparent molar volumes, Vϕ and apparent molar isentropic compressibilities, Ks,ϕ of three benzyldimethylammonium based protic ionic liquids, namely, benzyldimethylammonium acetate (BDMAA), benzyldimethylammonium propionate (BDMAP), and benzyldimethylammonium hexanoate (BDMAH) in water and ethanol have been determined at T=(293.15, 298.15, 303.15, 308.15, 313.15 and 318.15)K and at ambient pressure from density, ρ and speed of sound, u measurements. The Redlich-Mayer type of equation has been used to calculate the apparent molar volume, Vϕ∞ and apparent molar isentropic compressibility, Kϕ∞ at infinite dilution, and the corresponding empirical parameters (Sv, Bv, Sk and Bk). The negative magnitude of limiting volumetric slopes, Sv versus m1/2 for (BDMAA+ethanol) binary solutions, suggests that BDMAA-ethanol interactions are strong. Further, the change in thermodynamic properties of binary solutions in relation to the alternation in the anionic structural constitution of protic ionic liquids has also been evaluated. © 2014 Elsevier B.V.

Ramesh L. Gardas

Department Of Chemistry

Dasthaiah Keshapolla

compressibility

Density of liquids

Ethanol

Liquids

Thermodynamic properties

Volatile fatty acids

Volume measurement

Ambient pressures

APPARENT MOLAR ISENTROPIC COMPRESSIBILITIES

APPARENT MOLAR PROPERTIES

Apparent molar volume

BENZYLDIMETHYLAMMONIUM ACETATE

EMPIRICAL PARAMETERS

INFINITE DILUTION

PROTIC IONIC LIQUIDS

Ionic liquids

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Fluid Phase Equilibria

In the maneuver to achieve desulfurization, we have explored various nitro-substituted positional isomeric imidazolium-based aprotic ionic liquids (ILs). Ortho-, meta-, and para-substituted nitro benzyl group-aided imidazolium-based ILs were synthesized and used to understand the extractive desulfurization (EDS) efficiency of fuels. ILs chosen for the experiment were optimized using the B3LYP method and 6-311(++)g(d,p) of Gaussian 09, and their interactions with thiophene derivatives were analyzed using the integrated electric field polar continuum model solvation. Free energy of solvation provided qualitative information about the ability of ILs to achieve desulfurization. Parameters affecting the efficiency of synthesized ILs were perused, such as the effect of IL volume, concentration, duration of rotation, and other such parameters. Lewis acidity, availability of the Lewis acidic site and π-πinteraction influenced the EDS efficiency of ILs. Copyright © 2019 American Chemical Society.

Energy and Fuels

Effect of Nitro Groups on Desulfurization Efficiency of Benzyl-Substituted Imidiazolium-Based Ionic Liquids: Experimental and Computational Approach

In the present work, density, ρ and speed of sound, u measurements have been performed, for binary mixtures of two synthesized Brønsted-acidic ionic liquids namely N,N,N-triethyl-4-sulfobutaneammonium hydrogensulfate, [N222(C4SO3H)][HSO4] and N,N,N-triethyl-4-sulfobutaneammonium trifluoromethanesulfonate, [N222(C4SO3H)][CF3SO3] with water and DMSO as solvents. Experimental measurements have been carried out at variable concentrations of ILs in the temperature range of (293.15 to 328.15) K with the constant interval of 5 K and at atmospheric pressure. Using experimentally measured density and speed of sound data, apparent molar volume, Vϕ and apparent molar isentropic compressibility, Ks, ϕ and limiting apparent molar expansion, Eϕ ∞ have additionally been derived for the studied binary solutions. Apparent molar property data were fitted to the Redlich-Mayer type equation from which corresponding derived properties i.e. apparent molar volume and apparent molar isentropic compressibility at infinite dilutions, Vϕ ∞ and κs, ϕ ∞ were attained. Magnitude of these derived properties and corresponding empirical parameters were evaluated in the scope of understanding the nature of interactions prevailing among ions of ILs as well as ions and solvents. © 2018 Elsevier B.V.

Journal of Molecular Liquids

Understanding the solvation behavior of SO3H functionalized Brønsted acidic ionic liquids in water and DMSO: Volumetric and acoustic approach

To understand the molecular interactions among the components of aqueous solutions with cholinium based aprotic ionic liquids (AILs), their partial molar properties have been studied. Four cholinium based AILs-namely, cholinium propanoate ([Chl][Pro]), cholinium butanoate ([Chl][But]), cholinium pentanoate ([Chl][Pen]) and cholinium hexanoate ([Chl][Hex]) were synthesized and characterized. Thermodynamic properties of these AILs in water at various temperature (293.15 to 333.15) K and at atmospheric pressure were determined from density and speed of sound measurements. Derived thermodynamic properties and related empirical parameters at infinite dilution were also determined using the Redlich-Mayer type of equation. The studied AILs are observed to interact strongly with water, although the ion-solvent interactions decrease with increase in temperature as well as with increase in concentration. © 2018 Elsevier B.V.

Molecular interactions of choline based ionic liquids with water at different temperatures: An experimental study

The precise and accurate thermophysical properties determination of ionic liquid (IL)-solvent binary system is needed for understanding the molecular interactions occurring between these components. The nature of ion-ion and ion-solvent interactions can be studied either experimentally on the basis of apparent and partial molar properties and corresponding infinite dilution properties or by computational studies. In this regard, we have measured the thermodynamic properties of binary aqueous solutions containing newly synthesized N-methylpyrrolidone based protic ionic liquids (PILs) in the temperature range (288.15–328.15) K and at ambient pressure. Experimentally measured density and speed of sound data have been used to calculate the infinite dilution partial molar properties and the corresponding empirical parameters through the Redlich-Mayer type of equation. It is observed that the studied PILs interacts strongly with water, however the ion-solvent interactions decreases with increase in anionic chain length and increase in temperature. Observed intra-ionic and inter-ionic interactions in studied aqueous ionic liquid mixtures were also supported by Density Functional Theory (DFT) calculations. © 2017 Elsevier B.V.

Understanding ion-ion and ion-solvent interactions in aqueous solutions of NMP based protic ionic liquids through partial molar properties and DFT calculations

Volumetric and ultrasonic properties of ionic liquid (IL) with molecular solvents are important parameter for elucidation of solute-solute and solute-solvent interactions occurring in solutions. In the present work, the density, ρ and speed of sound, u for binary solutions of the protic ionic liquid (1,8-diazabicyclo [5.4.0] undec-7-en-8-ium trifluromethane sulfonate), with molecular solvents like water and ethanol have been measured as a function of molality in temperature range (293.15 to 318.15) K and at atmospheric pressure. From the experimental data, apparent molar volume, Vφ, apparent molar isentropic compression, Ks,φ and limiting apparent molar expansion, Eφ ∞ have been calculated. Further, to understand the extent of interaction between studied IL and solvents the apparent molar properties at infinite dilution were analyzed by using Redlich-Mayer type equation. © 2017 Elsevier B.V.

Effect of temperature on apparent molar properties of DBU based protic ionic liquid in aqueous and ethanolic solutions

The experimental density, ρ, speed of sound, u and viscosity, η values as a function of ionic liquid concentration, m for binary mixtures (benzyldimethylammonium propionate/benzyldimethylammonium hexanoate + N,N-dimethylformamide) were measured at T = 293.15 to 328.15 K and at atmospheric pressure. Apparent molar volumes, Vφ, and apparent molar isentropic compressibilities, Ks,φ, have been determined from the experimental densities and speed of sound and fitted to a Redlich-Mayer equation for the calculation of limiting parameters (Vφ∞and Kφ∞). The calculated Vφ∞and Kφ∞values indicate that ionic liquid-molecular solvent interactions are stronger for benzyldimethylammonium hexanoate (BDMAH) in DMF than the benzyldimethylammonium propionate (BDMAP) in DMF mixtures. The limiting apparent molar expansibilities, α at each temperature for both ionic liquids in DMF have positive values. The viscosity data have been analyzed using the Jones-Dole equation, and the derived parameters B and A have also been interpreted in terms of ion-solvent and ion-ion interactions. © 2014 Elsevier B.V.

Volumetric, acoustic and transport properties of binary mixtures of benzyldimethylammonium based ionic liquids with N,N-dimethylformamide at temperature from 293.15 to 328.15 K

Synthesis and physico-chemical properties of two protic ionic liquids based on stearate anion

Journal of Chemical & Engineering Data

Comparative Study on Physicochemical Properties of Protic Ionic Liquids Based on Allylammonium and Propylammonium Cations

The Journal of Chemical Thermodynamics

Volumetric, viscosity, and electrical conductivity properties of aqueous solutions of two n-butylammonium-based protic ionic liquids at several temperatures

Thermochimica Acta

Thermal properties of 1-alkyl-3-methylpyridinium halide-based ionic liquids

Apparent molar properties of benzyldimethylammonium based protic ionic liquids in water and ethanol at different temperatures

Journal	Data powered by TypesetFluid Phase Equilibria
Publisher	Data powered by TypesetElsevier
ISSN	03783812
Open Access	No