Showing papers in "Journal of Chemical & Engineering Data in 2006"
TL;DR: In this paper, the coefficients of these short forms for the equations of state have been fitted for the fluids acetone, carbon monoxide, carbonyl sulfide, decane, hydrogen sulfide and fluoromethane.
Abstract: In a preceding project, functional forms for “short” Helmholtz energy equations of state for typical nonpolar and weakly polar fluids and for typical polar fluids were developed using simultaneous optimization. In this work, the coefficients of these short forms for the equations of state have been fitted for the fluids acetone, carbon monoxide, carbonyl sulfide, decane, hydrogen sulfide, 2-methylbutane (isopentane), 2,2-dimethylpropane (neopentane), 2-methylpentane (isohexane), krypton, nitrous oxide, nonane, sulfur dioxide, toluene, xenon, hexafluoroethane (R-116), 1,1-dichloro-1-fluoroethane (R-141b), 1-chloro-1,1-difluoroethane (R-142b), octafluoropropane (R-218), 1,1,1,3,3-pentafluoropropane (R-245fa), and fluoromethane (R-41). The 12 coefficients of the equations of state were fitted to substance specific data sets. The results show that simultaneously optimized functional forms can be applied to other fluids out of the same class of fluids for which they were optimized without significant loss of a...
629 citations
TL;DR: In this article, the solubility of 17 commonly available metal oxides in the elemental mass series Ti through Zn have been determined in three ionic liquids based on choline chloride.
Abstract: The solubility of 17 commonly available metal oxides in the elemental mass series Ti through Zn have been determined in three ionic liquids based on choline chloride. The hydrogen bond donors used were urea, malonic acid, and ethylene glycol. The results obtained are compared with aqueous solutions of HCl and NaCl. Some correlation is observed between the solubility in the deep eutectic solvents and that in aqueous solutions but some significant exceptions offer an opportunity for novel solvato-metallurgical processes.
509 citations
TL;DR: In this article, the density and viscosity properties of binary mixtures of water and three ionic liquids were determined for binary systems, i.e., 1-ethyl-3-methylimidazolium ethylsulfate, 1-methyl-3methyloride-naphthalamide trifluoroacetate, and 1-ethyl-sulfonate, at atmospheric pressure and temperatures from (278.15 to 348.15) K.
Abstract: Density and viscosity were determined for binary mixtures of water and three ionic liquids: 1-ethyl-3-methylimidazolium ethylsulfate, 1-ethyl-3-methylimidazolium trifluoroacetate, and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate. The experimental measurements of these properties were carried out at atmospheric pressure and temperatures from (278.15 to 348.15) K. The temperature dependence of density and viscosity for these systems can be described by an empirical second-order polynomial and by the Vogel−Fulcher−Tammann equation, respectively. Excess molar volumes and viscosity deviations were calculated and correlated by Redlich−Kister polynomial expansions. The latter correlations describe the variation of density and viscosity with composition. Comparison of the results for the three binary systems elucidates the influence of the anion on these physical properties.
453 citations
TL;DR: The physical properties of the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate (EMISE) were reported in this paper.
Abstract: This paper reports on the synthesis and the physical properties of the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate (EMISE). Experimental densities, speeds of sound and refractive indices were determined from (288.15 to 343.15) K. Dynamic viscosities were measured from (298.15 to 343.15) K and surface tension were measured from (288.15 to 313.15) K for pure ionic liquid. Densities, dynamic viscosities, speeds of sound, and isentropic compressibilities have been determined over the whole composition range for ethanol (1) + EMISE (2) and water (1) + EMISE (2) binary systems at T = (298.15, 313.15, and 328.15) K and atmospheric pressure. Excess molar volumes, viscosity deviations, and deviations in isentropic compressibility for the binary systems were fitted to a Redlich−Kister equation to determine the fitting parameters and the root mean square deviations. Refractive indices were measured at 298.15 K over the whole composition range for the ethanol (1) + EMISE (2) and water (1) + EMISE (2) binary...
348 citations
TL;DR: In this article, the authors measured the viscosities, densities, and refractive indices of the binary systems at the above mentioned temperatures and fitted them to a Redlich−Kister equation to determine the fitting parameters and root mean square deviations.
Abstract: Dynamic viscosities, densities, and refractive indices have been measured from T = 298.15 K to T = 343.15 K for 1-hexyl-3-methylimidazolium chloride, [C6mim][Cl], and 1-methyl-3-octylimidazolium chloride, [C8mim][Cl]. Dynamic viscosities and densities have been determined over the whole composition range for water + [C6mim][Cl] and water + [C8mim][Cl] at T = (298.15, 313.15, 328.15, and 343.15) K and 0.1 MPa of pressure. Excess molar volumes and viscosity deviations for the binary systems at the above-mentioned temperatures were fitted to a Redlich−Kister equation to determine the fitting parameters and the root mean square deviations. Densities and viscosities of water + 1-butyl-3-methylimidazolium chloride, [C4mim][Cl], at T = (298.15, 313.15, 328.15, and 343.15) K and 0.1 MPa of pressure have been measured, and apparent molar volumes were determined.
276 citations
TL;DR: In this paper, experimental densities, isobaric heat capacities, and enthalpies of fusion for one sample of 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6], and two samples of 1 butyl- 3methyloridazolate bis(trifluoromethylsulfonyl)imide, [BMim][NTf2], are reported.
Abstract: Experimental densities, isobaric heat capacities, and enthalpies of fusion for one sample of 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6], and two samples of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [bmim][NTf2], are reported. Data were obtained at atmospheric pressure and, in the case of the density and the heat capacity, within the temperature intervals (283.15 to 323.15) K and (278.15 to 333.15) K for [bmim][PF6] and [bmim][NTf2], respectively. A critical analysis of the effect of impurities on the measured thermodynamic properties is performed.
259 citations
TL;DR: In this paper, the viscosities of the ionic liquids 1-methyl-3-octylimidazolium hexafluorophosphate, [OMIM]PF6, and 1-methylamide tetrafluoroborate (BF4) were measured with a falling-body viscometer and the overall uncertainty was estimated at ± 2 to 3 %.
Abstract: The viscosities of the ionic liquids 1-methyl-3-octylimidazolium hexafluorophosphate, [OMIM]PF6, and 1-methyl-3-octylimidazolium tetrafluoroborate [OMIM]BF4, have been measured between (0 and 80) °C and at pressures to 176 MPa ([OMIM]PF6) and 224 MPa ([OMIM]BF4) with a falling-body viscometer. The overall uncertainty is estimated at ± (2 to 3) %. Modified Litovitz and Vogel−Fulcher−Tammann equations are used to represent the temperature and pressure dependence. The T0 parameter for the latter is found to be consistent with Angell's relationship linking T0 and the strength parameter D with the glass temperature Tg. Densities between (0 and 90) °C at atmospheric pressure are also reported for both substances. These have an overall uncertainty estimated at ± 0.00005 g·cm-3. The in-built viscosity correction for the Anton-Paar DMA5000 densimeter was confirmed using high-viscosity reference standards to an upper limit of 16 Pa·s.
242 citations
TL;DR: In this paper, the authors measured the densities and viscosities of water + 1-butyl-3-methylimidazolium tetrafluoroborate (TFLB) using a multiparametric nonlinear regression method.
Abstract: Densities and viscosities of water (1) + 1-butyl-3-methylimidazolium tetrafluoroborate (2) were measured over the entire mole fraction range from (303.15 to 353.15) K. From these data, excess molar volumes (VE), and viscosity deviations (Δη) were calculated. The VE and Δη were fitted to the Redlich−Kister equation using a multiparametric nonlinear regression method. Estimated coefficients of the Redlich−Kister equation and standard deviation calculated from the Redlich−Kister equation to the experimental data are also presented. The results show that the densities and viscosities are dependent strongly on water content. Comparatively, the viscosity deviation Δη is more sensitive to temperature than the excess molar volume VE.
209 citations
TL;DR: Binary mutual diffusion coefficients measured by the Taylor dispersion method in two different laboratories (University of Naples, Federico II, Italy, and University of Coimbra, Portugal) are reported for aqueous solutions of lactose, sucrose, glucose, and fructose at various concentrations (0001 to 01) mol·dm-3 and temperatures (29815 to 32815) K as discussed by the authors.
Abstract: Binary mutual diffusion coefficients measured by the Taylor dispersion method in two different laboratories (University of Naples, Federico II, Italy, and University of Coimbra, Portugal) are reported for aqueous solutions of lactose, sucrose, glucose, and fructose at various concentrations (0001 to 01) mol·dm-3 and temperatures (29815 to 32815) K The hydrodynamic radius and activation energy for the diffusion of aqueous sugars are calculated from those results In addition, the measured diffusion coefficients are used with the Hartley equation to estimate activity coefficients for aqueous lactose, sucrose, glucose, and fructose
181 citations
TL;DR: In this paper, the solubility and diffusivity of difluoromethane in 19 room-temperature ionic liquids (RTILs) with fluorocarbon sulfonate anions have been investigated.
Abstract: New experimental results are presented for the solubility and diffusivity of difluoromethane in 19 room-temperature ionic liquids (RTILs). In the series of RTILs presented here, eight RTILs with five new fluorocarbon sulfonate anions have been prepared for the first time. The measurements were performed using a gravimetric microbalance at temperatures between (283.15 and 348.15) K and at pressures from (0.01 to 1.0) MPa. Experimental gas solubility data were successfully correlated with the nonrandom two-liquid (NRTL) solution model. The solubility of difluoromethane in RTILs is affected by the choice of both the cation and anion. Diffusivities obtained from the time-dependent absorption data were well analyzed using a model based on a modified Stokes−Einstein equation. The calculated molecular size for difluoromethane is 2 to 3 times larger than the known size.
174 citations
TL;DR: In this article, the influence of pressure as well as that of the anion on several properties of this type of ionic liquids have been determined, such as the isothermal compressibility, the isobaric expansivity, and the thermal pressure coefficient.
Abstract: The current study focuses on several phosphonium-based ionic liquids, namely, trihexyltetradecylphosphonium chloride, trihexyltetradecylphosphonium acetate, and trihexyltetradecylphosphonium bis{(trifluoromethyl)sulfonyl}amide. The objective was to study the influence of pressure as well as that of the anion on several properties of this type of ionic liquids. Densities in pure ionic liquids as a function of temperature and pressure have been determined. Other thermodynamic properties, such as the isothermal compressibility, the isobaric expansivity, and the thermal pressure coefficient, have been calculated. Density measurements have been performed at a broad range of temperature (298 < T/K < 333) and pressure (0.1 < p/MPa < 65) using a vibrating tube densimeter. A simple ideal-volume model was employed for the prediction of the molar volumes of the phosphonia at ambient conditions, which proved to compare favorably with the experimental results.
TL;DR: In this article, the Jatropha curcas L. oil (oil) has been transesterified to give J. curcas l. oil methyl ester (FAME).
Abstract: Biodiesel is manufactured by transesterification of animal fat or vegetable oil. The reactants (oil and methanol) and the products (fatty acid methyl ester and glycerol) are partially mutual soluble in the reaction process. Inter-solubility of the reaction components is essential data for the production design and process operation. In this work, the Jatropha curcas L. oil (oil) has been transesterified to give Jatropha curcas L. oil methyl ester (FAME). The inter-solubility of FAME + methanol + glycerol, oil + FAME + methanol, oil + glycerol + methanol, and oil + FAME + glycerol in the range from 298.15 K to 333.15 K has been conducted. Methanol is completely soluble in both FAME and glycerol but is not soluble in oil. With an increase in the mass fraction of FAME, the solubility of methanol in the oil + FAME phase increases. The transesterification reaction is carried out in the methanol phase, and as a result, the reaction shows an induction period. When FAME content increases to 70 %, the oil + methan...
TL;DR: In this article, the solubility data of carbon dioxide, propane, propene, butane, and 1-butene in the ionic liquid 1butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf2N]) are presented as a function of pressure at temperatures between 280 K and 340 K.
Abstract: Solubility data of carbon dioxide, propane, propene, butane, and 1-butene in the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([bmim][Tf2N]) are presented as a function of pressure at temperatures between 280 K and 340 K. The equilibrium pressure at a given temperature and the amount of gas dissolved into the ionic liquid phase were measured with an experimental technique based on a saturation method at constant volume by use of an apparatus equipped with a cylindrical equilibrium view cell. All measured solubilities were between 0.1 and 0.5 mole fraction gas in ionic liquid. 1-Butene had the highest solubility, followed by butane, propene, and then propane. Carbon dioxide and propane are similarly the least soluble in the [bmim][Tf2N]. Alkene gases were more soluble than alkane gases. From the experimental solubility data, the Henry's constants of each gas in the ionic liquid were estimated as a function of temperature.
TL;DR: In this article, dynamic viscosities, densities, and speed of sound of 1-methyl-3-octylimidazolium chloride, with methanol, ethanol, and 1-propanol at T = (29815, 31315, and 32815) K and refractive index atT = 29815 K and P = 1 MPa have been measured over the whole composition range.
Abstract: In this work, dynamic viscosities, densities, and speed of sound of 1-methyl-3-octylimidazolium chloride, [C8mim][Cl], with methanol, ethanol, and 1-propanol at T = (29815, 31315, and 32815) K and refractive index at T = 29815 K and P = 01 MPa have been measured over the whole composition range Excess molar volumes, isentropic compressibility deviations, and viscosity deviations for the binary systems from T = (29815 to 32815) K were calculated These results were fitted to a Redlich−Kister equation to determine the fitting parameters and the root mean square deviations
TL;DR: In this article, the ionic liquid [mebupy]BF4 is used as a solvent for liquid−liquid extraction and the experimental data for the binary and ternary systems were well-correlated with the NRTL model.
Abstract: This research focused on a study of the ionic liquid 4-methyl-N-butylpyridinium tetrafluoroborate ([mebupy]BF4) as a solvent in liquid−liquid extraction. Liquid−liquid equilibrium data were obtained for mixtures of 4-methyl-N-butylpyridinium tetrafluoroborate + (benzene or ethylbenzene or m-xylene) + (N-hexane or N-octane) at T = (313.2 and 348.2) K and T = (313.2 and 333.2) K for the ternary mixture with benzene and p = 0.1 MPa. The experimental data for the binary and ternary systems were well-correlated with the NRTL model. The aromatic/aliphatic selectivity values were comparable to those of toluene + N-heptane. The ionic liquid [mebupy]BF4 is therefore a suitable solvent for an industrial extraction process for the separation of aromatic and aliphatic hydrocarbons.
TL;DR: In this article, a high pressure view-cell technique based on the synthetic method was used to determine the solubility of carbon dioxide in the ionic liquid 1-n-butyl-3-methylimidazolium methyl sulfate.
Abstract: A high-pressure view-cell technique based on the synthetic method was used to determine the solubility of carbon dioxide in the ionic liquid 1-n-butyl-3-methylimidazolium methyl sulfate ([bmim][CH3...
TL;DR: In this paper, a new static apparatus, capable of measuring vapor pressures in the range (0.4 to 133) Pa and in the temperature range (243 to 413) K, is fully described.
Abstract: A new static apparatus, capable of measuring vapor pressures in the range (0.4 to 133) Pa and in the temperature range (243 to 413) K, is fully described. The performance of the new apparatus was checked by measuring the vapor pressures of four compounds recommended as reference materials for the measurement of vapor pressurenaphthalene, benzoic acid, benzophenone, and ferrocene. A recommended value for the enthalpy of sublimation of benzophenone, (298.15 K) = (95.1 ± 1.9) kJ·mol-1, is suggested.
TL;DR: Experimental data for viscosities, diffusion coefficients of ferrocene, and conductivities were obtained for three ionic liquid mixtures: 1-butyl-3methylimidazolium tetrafluoroborate (bmimBF4), N...
Abstract: Experimental data for viscosities, diffusion coefficients of ferrocene, and conductivities were obtained for three ionic liquid mixtures: 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF4), N...
TL;DR: In this article, the dielectric constant, dipole moment, and solubility parameters of carbonates have been derived from capacitance measurements using an auto-balancing bridge at 20, 25, and 40 °C.
Abstract: Dielectric constant, dipole moment, and solubility parameters are reported for ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), and glycerin carbonate (GC). Dielectric constants have been determined from capacitance measurements using an auto-balancing bridge at 20, 25, and 40 °C. Values of permanent dipole moment of carbonates have been obtained from dielectric constant measurements on dilute solutions of carbonates in benzene and 1,4-dioxane. Hildebrand and Hansen solubility parameters of carbonates have been calculated using several different techniques.
TL;DR: The solubility of three estrogenic hormones, 17β-estradiol, and 17α-ethynylstradiol and the industrial pollutant bisphenol A were measured in water, dilute acid and alkali (pH 4 and 10, respectively), and aqueous KNO3 (0.51 ± 0.1 mol·L-1) as discussed by the authors.
Abstract: The solubilities of three estrogenic hormonesestrone, 17β-estradiol, and 17α-ethynylestradioland the industrial pollutant bisphenol A were measured in water, dilute acid and alkali (pH 4 and 10, respectively), and aqueous KNO3 (0.01 mol·L-1 and 0.1 mol·L-1). The concentrations of saturated solutions, after equilibration at (25.0 ± 0.5) °C with excess solid for 4 days, were determined by HPLC. Six replicate results were obtained for each solute−solvent pair: the coefficient of variation was in most cases < 5 %. The solubilities in pure water with standard deviations were estrone (1.30 ± 0.08) mg·L-1, 17β-estradiol (1.51 ± 0.04) mg·L-1, 17α-ethynylestradiol (9.20 ± 0.09) mg·L-1, and bisphenol A (300 ± 5) mg·L-1. The solubility of each of the hormones was unchanged between pH 4 and pH 7 but was greater at pH 10. At pH 7, the hormones became progressively less soluble as the ionic strength increased from 0.0 to 0.1 mol·L-1. By contrast the solubility of bisphenol A was essentially the same under all of the e...
TL;DR: In this paper, the heat capacities of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [C6mim][NTf2] have been measured with a new adiabatic calorimeter in a range of temperatures of (5 to 370) K.
Abstract: Heat capacities of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [C6mim][NTf2] have been measured with a new adiabatic calorimeter in a range of temperatures of (5 to 370) K. The substance was found to form glass with Tg = 184.3 K and Cs,m = (170.7 ± 2.8) J·K-1·mol-1. At different modes of crystallization [C6mim][NTf2] forms at least three crystals, the heat capacities of which differ up to 2 % in the temperature range of (220 to 250) K but coincide within 0.1 % in the temperature range of (80 to 220) K. Triple-point temperature for all the crystals is T0 = (272.03 ± 0.01) K, but the enthalpies of fusion are somewhat different. Thermodynamic properties for [C6mim][NTf2] are calculated based on the obtained data.
TL;DR: In this paper, the melting properties of salicylic acid were determined by differential scanning calorimetry and a correlation was observed between the solubility and the van't Hoff enthalpy of solution.
Abstract: The solubility of salicylic acid has been investigated in methanol, acetonitrile, acetic acid, acetone, water, and ethyl acetate from (10 to 50) °C. No new polymorphs or solvates of salicylic acid were found. The melting properties of salicylic acid were determined by differential scanning calorimetry. A correlation was observed between the solubility and the van't Hoff enthalpy of solution. A higher solubility was related to a lower van't Hoff enthalpy of solution. Water differed from the organic solvents in terms of solubility and its correlation to the van't Hoff enthalpy of solution. In addition, the morphology of salicylic acid crystals recrystallized from water differed from the other solvents.
TL;DR: In this paper, a high-pressure ultrasonic cell was designed and built to allow for precise speed of sound measurements in liquids, and the uncertainty of the sound measurements is 0.05 %.
Abstract: The current study focuses on 1-propyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [C3mim][NTf2], and 1-pentyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [C5mim][NTf2]. The objective is to study the influence of pressure as well as that of the cation's alkyl chain length on several properties of this type of ionic liquids. Speed of propagation of ultrasound waves and densities in pure ionic liquids as a function of temperature and pressure have been determined. Other thermodynamic properties such as compressibilities and expansivities have been obtained. Speed of sound measurements have been carried out in broad ranges of temperature (298 < T/K < 338) and pressure (0.1 < p/MPa < 200). A novel high-pressure ultrasonic cell was designed and built to allow for precise speed of sound measurements in liquids. The uncertainty of the speed of sound measurements is 0.05 %. A detailed description of the cell is presented. Density measurements have been performed over a broad range of temperat...
TL;DR: In this paper, the authors used trihexyl-tetradecyl-phosphonium cation (thtd-Ph) based ionic liquids (ILs) with the anions chloride [Cl], tetrafluoroborate [BF4], and bis(trifluoromethane sulfonylimide)[(Tf)2N] to separate aliphatic and aromatic compounds.
Abstract: Separation of aliphatic and aromatic compounds was studied using the high molecular weight trihexyl-tetradecyl-phosphonium cation (thtd-Ph) based ionic liquids (ILs) with the anions chloride [Cl], tetrafluoroborate [BF4], and bis(trifluoromethane sulfonylimide)[(Tf)2N]. Infinite dilution activity coefficients (γ∞) for these novel solvents have been measured at T = (308.15, 318.15, and 328.15) K, using gas−liquid chromatography. The aliphatic solutes studied were normal alkanes (pentane, hexane, heptane, octane), alkenes (hexene, heptene, octene), alkynes (hexyne, heptyne, octyne), cycloalkanes (cyclopentane, cylcohexane, cycloheptane), and alcohols (methanol, ethanol). The aromatic solute studied was benzene. The molar excess enthalpy at infinite dilution (HE,∞) was calculated using the temperature dependency of γ∞ data. The selectivity values for the phosphonium-based ILs indicate a poorer separation capability than imidazolium- or pyridinium-based ILs. The values of γ∞ have been found to be in the follo...
TL;DR: In this article, a new adsorbent, manganese oxide coated zeolite (MOCZ), was characterized and employed for the removal of Cu(II) and Pb(II), from aqueous solution using batch equilibrium experiments.
Abstract: A new adsorbent, manganese oxide coated zeolite (MOCZ), was characterized and employed for the removal of Cu(II) and Pb(II) from aqueous solution using batch equilibrium experiments. Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and BET analyses were used to observe the surface properties of the coated layer. Binding of Cu(II) and Pb(II) ions by MOCZ was clearly pH-dependent, and the loading capacities increased with increasing pH. Adsorption behavior of Cu(II) and Pb(II) ions can be approximately described with the Langmuir and Redlich−Peterson equation. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°) were also determined, and the adsorption process is more favored at higher temperatures.
TL;DR: In this paper, the apparent molar volumes for the saccharides in aqueous glycine or l-alanine solutions have been evaluated, together with the standard transfer volumes Δt of the macromolecular molecules from water to amino acid solutions, in terms of the structural interaction model and stereo structure of monosaccharide molecules.
Abstract: Apparent molar volumes VΦ,S and viscosity B-coefficients for d-(+)-glucose, d-(+)-galactose, d-(+)-xylose, and d-(−)-ribose in aqueous amino acid (glycine or l-alanine) solutions have been determined respectively from density and viscosity measurements at 298.15 K. Infinite-dilution apparent molar volumes for the saccharides in aqueous glycine or l-alanine solutions have been evaluated, together with the standard transfer volumes Δt of the saccharides from water to aqueous amino acid solutions. It is shown that values of transfer volumes and viscosity B-coefficients are positive and increase with increasing amino acid contents. Volumetric parameters indicating the interactions of saccharides with amino acids in water have been obtained from the transfer volumes of the saccharides. The interactions between saccharides and amino acids are discussed in terms of the structural interaction model and the stereo structure of monosaccharide molecules.
TL;DR: In this paper, isobaric ternary vapor−liquid equilibria for the ionic liquid 1-butyl-3methylimidazolium methylsulfate (BMimMSO4) + ethanol + water were carried out at 1013 kPa.
Abstract: In this work, isobaric ternary vapor−liquid equilibria for the ionic liquid 1-butyl-3-methylimidazolium methylsulfate (BMimMSO4) + ethanol + water and for the corresponding binary systems containing the ionic liquid were carried out at 1013 kPa Vapor−liquid equilibria data of binary systems were correlated using the e-NRTL and NRTL equations The ternary system was correlated using the NRTL equation A study of the evolution of the ethanol + water azeotrope composition with different amounts of ionic liquid was made
TL;DR: The phase diagrams corresponding to systems of sodium citrate and poly(ethylene glycol) of different molecular weights (600, 1000, 1450, 3350, and 8000) were determined at (22, 37 and 50) °C. The binodal curves were described using a fourparameter sigmoidal equation, and the tie-lines were satisfactorily described using the Othmer−Tobias and Bancroft equations as discussed by the authors.
Abstract: The phase diagrams corresponding to systems of sodium citrate and poly(ethylene glycol) of different molecular weights (600, 1000, 1450, 3350, and 8000) were determined at (22, 37 and 50) °C. Moreover, the medium pH (5.2, 8.2, and 9.2) effect was also studied. The binodal curves were described using a four-parameter sigmoidal equation, and the tie-lines were satisfactorily described using the Othmer−Tobias and Bancroft equations. An increase in temperature and pH caused the expansion of the two-phase area. The binodal curves became more asymmetric and close to the origin with an increase in poly(ethylene glycol) molecular weight.
TL;DR: In this paper, the properties of ionic liquids containing pyridinium cations have been investigated and shown to exhibit higher melting points, lower solubility in water, and higher polarity than those containing imidazoliumcations.
Abstract: Syntheses are reported for ionic liquids containing 1-methyl-3-octylimidazolium or 1-butyl-4-methylpyridinium cations and trifluoromethyl sulfonate, dicyanamide, bis(trifluoromethylsulfonyl)imide, or nonafluorobutyl sulfonate anions. Densities, melting points, glass-transition temperatures, solubilities in water, and polarities have been measured. Ionic liquids containing pyridinium cations exhibit higher melting points, lower solubility in water, and higher polarity than those containing imidazolium cations.
TL;DR: In this article, the authors reported on the synthesis of the ionic liquid 1,3-dimethylimidazolium methyl sulfate [MMIM][MeSO4] and determined experimental densities, speed of sounds, and refractive indices from (283.15 to 343.15) K.
Abstract: This paper reports on the synthesis of the ionic liquid 1,3-dimethylimidazolium methyl sulfate [MMIM][MeSO4]. Experimental densities, speed of sounds, and refractive indices were determined from (283.15 to 343.15) K. Dynamic viscosities were measured from (293.15 to 343.15) K. Surface tensions were measured from (288.15 to 313.15) K. The coefficient of thermal expansion and molecular volume of [MMIM][MeSO4] were calculated from experimental values of density.