scholarly journals Correlation and prediction of the physical and excess properties of the ionic liquid 1-butyl-3-methylimidazolium methyl sulphate with several alcohols at T= (298.15 to 313.15) K

2013 ◽  
Author(s):  
◽  
Sangeeta Singh
Keyword(s):  
Refractive Index ◽  
Ionic Liquid ◽  
Binary Mixtures ◽  
Binary Systems ◽  
Excess Molar Volumes ◽  
Partial Molar Volumes ◽  
Excess Properties ◽  
Excess Isentropic Compressibilities ◽  
Molar Volumes ◽  
Isentropic Compressibilities

The thermodynamic properties of binary liquid mixtures using an ionic liquid (IL) with alcohols were determined at different temperatures. The ionic liquid used was 1-butyl-3- methylimidazolium methylsulphate [BMIM]+[MeSO4]-. Densities, speed of sound, and refractive indices for the binary mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or 1-butanol) were experimentally measured over the whole range of composition at T = (298.15, E 303.15, 308.15, and 313.15) K. From the experimental data, excess molar volumes, V m , E , deviations in refractive isentropic compressibilities, κ s , excess isentropic compressibilities, κ S indices, ∆n, and molar refractions, R, were calculated. The excess partial molar volumes were also calculated at T = 298.15 K. For the binary systems, ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or E E E 1-butanol) V m and κ S are always negative and V m decrease slightly when the temperature increases. The refractive index deviation at T = (298.15, 303.15, 308.15, and 313.15) K is positive over the whole composition range. The measured negative values for excess molar volume of these mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or 1-butanol) indicate strong ion-dipole interactions and packing between alcohols and IL are present. The Redlich-Kister smoothing polynomial equation was satisfactorily applied for the E E fitting of the V m , κ S , and ∆n data to give the fitting parameters and the root-mean-square deviations. The Lorentz-Lorenz (L-L) equation was also used to correlate the volumetric property and predict the density or refractive index of the binary mixtures of ionic liquid and the organic solvents. The Lorentz-Lorenz approximation gives a higher σ when used to correlate the iiiexcess molar volumes for the mixtures ([BMIM]+[MeSO4]- + methanol, or 1-propanol, or 2-propanol, or 1-butanol). The L-L equation gives good results for the prediction of density and refractive index. The results are discussed in terms of solute-solute, solute-solvent and solvent- solvent interactions.

Ultrasonic speeds and isentropic compressibilities of binary mixtures of n-octane with each of the hexane isomers at 298.15 K

1987 ◽  
Vol 65 (2) ◽  
pp. 322-325 ◽  
Author(s):  
George C. Benson ◽  
Carl J. Halpin
Keyword(s):  
Binary Mixtures ◽  
Excess Molar Volumes ◽  
Ultrasonic Speed ◽  
Excess Isentropic Compressibilities ◽  
Flory Theory ◽  
Molar Volumes ◽  
Isentropic Compressibilities ◽  
Theory Of Mixtures ◽  
Derivatives Of ◽  
Good Agreement

Measurements of ultrasonic speed were carried out for n-octane + each of the five hexanes at 298.15 K. The results were combined with excess molar volumes reported previously to obtain excess isentropic compressibilities and isentropic pressure derivatives of the excess molar volumes. These are in good agreement with estimates from the Flory theory of mixtures.

scholarly journals Excess molar volumes, partial molar volumes and isentropic compressibilities of binary systems (ionic liquid + alkanol)

2009 ◽  
Author(s):  
◽  
Precious N. Sibiya
Keyword(s):  
Thermodynamic Properties ◽  
Binary Mixtures ◽  
Intermolecular Interactions ◽  
Binary Systems ◽  
Excess Molar Volumes ◽  
Partial Molar Volumes ◽  
Isentropic Compressibility ◽  
Volume Data ◽  
Specific Chemical ◽  
Molar Volumes

The thermodynamic properties of binary liquid mixtures involving ionic liquids (ILs) with alcohols were determined. ILs are an important class of solvents since they are being investigated as environmentally benign solvents, because of their negligible vapour pressure, and as potential replacement solvents for volatile organic compounds (VOCs) currently used in industries. Alcohols were chosen for this study because they have hydrogen bonding and their interaction with ILs will help in understanding the intermolecular interactions. Also, their thermodynamic properties are used for the development of specific chemical processes. The excess molar volumes of binary mixtures of {1-ethyl-3-methylimidazolium ethylsulfate + methanol or 1-propanol or 2-propanol}, {trioctylmethylammonium bis (trifluoromethyl-sulfonyl) imide + methanol or ethanol or 1-propanol}, {1-buty-3-methylimidazolium methylsulfate + methanol or ethanol or 1-propanol} were calculated from experimental density values, at T = (298.15, 303.15 and 313.15) K. The Redlich-Kister smoothing polynomial was fitted to the excess molar volume data. The partial molar volumes of the binary mixtures {1-ethyl-3-methylimidazolium ethylsulfate + methanol or 1-propanol or 2-propanol}, {trioctylmethylammonium bis (trifluoromethyl-sulfonyl) imide + methanol or ethanol or 1-propanol}, {1-buty-3-methylimidazolium methylsulfate + methanol or ethanol or 1-propanol} were calculated from the Redlich-Kister coefficients, at T = (298.15, 303.15 and 313.15) K. This information was used to better understand the intermolecular interactions with each solvent at infinite dilution. iii The isentropic compressibility of {trioctylmethylammonium bis (trifluoromethyl-sulfonyl) imide + methanol or ethanol or 1-propanol}, were calculated from the speed of sound data at T = 298.15 K.

scholarly journals Thermophysical properties of binary mixtures of N,N-dimethylformamide with three cyclic ethers

2013 ◽  
Vol 78 (9) ◽  
pp. 1443-1460 ◽  
Author(s):  
Biswajit Sinha ◽  
Rajendra Pradhan ◽  
Sanjoy Saha ◽  
Dhiraj Brahman ◽  
Abhijit Sarkar
Keyword(s):  
Ambient Temperature ◽  
Binary Mixtures ◽  
Atmospheric Pressure ◽  
Excess Molar Volumes ◽  
Partial Molar Volumes ◽  
Excess Properties ◽  
Pfp Theory ◽  
Liquid Component ◽  
Molar Volumes ◽  
Excess Partial Molar Volumes

Densities and viscosities of the binary mixtures consisting of tetrahydrofuran (THF), 1,3-dioxolane (1,3-DO) and 1,4-dioxane (1,4-DO) with N,N-dimethylformamide (DMF) over the entire range of composition were measured at temperatures 298.15, 308.15 and 318.15 K and at atmospheric pressure. Ultrasonic speeds of sound of these binary mixtures were measured at ambient temperature and atmospheric pressure (T = 298.15 K and P = 1.01?105 Pa). The various experimental data were utilized to derive excess molar volumes (VmE), excess viscosities (?E), and excess isentropic compressibilities (?sE). Using the excess molar volumes (VmE), excess partial molar volumes (and ) and excess partial molar volumes at infinite dilution (and ) of each liquid component in the mixtures were derived and discussed. Excess molar volumes (VmE) as a function of composition at ambient temperature and atmospheric pressure were used further to test the applicability of the Prigogine-Flory-Patterson (PFP) theory to the experimental binaries. The excess properties were found to be either negative or positive depending on the nature of molecular interactions and structural effects of liquid mixtures. Em,1V Em,2VE0,m,1VE0,m,2V.

scholarly journals Prediction of excess molar volumes of selected binary mixtures from refractive index data

2014 ◽  
Vol 79 (6) ◽  
pp. 707-718 ◽  
Author(s):  
Jelena Vuksanovic ◽  
Divna Bajic ◽  
Gorica Ivanis ◽  
Emila Zivkovic ◽  
Ivona Radovic ◽  
...  
Keyword(s):  
Refractive Index ◽  
Binary Mixtures ◽  
Excess Molar Volumes ◽  
Mixing Rules ◽  
Mixing Rule ◽  
Molar Volumes ◽  
Index Data ◽  
Peg 400 ◽  
Benzene Toluene ◽  
Refractive Index Data

The excess molar volumes of twenty two binary mixtures containing various groups of organic compounds: alcohols (ethanol, 1-propanol, 1,2-propanediol, 1,3-propanediol and glycerol), ketone (acetone), ester (butyl lactate), lactam (N-methyl-2-pyrrolidone), PEGs (PEG 200, PEG 400) and aromatics (benzene, toluene and pyridine) were predicted from the refractive index data, using three types of equations coupled with several mixing rules for refractive index calculations: the Lorentz-Lorenz, Dale-Gladstone, Eykman, Arago-Biot, Newton, and Oster. The obtained results were analysed in terms of the applied equation and mixing rule and the nature of interactions between the mixtures? components.

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