Showing papers in "The Journal of Chemical Thermodynamics in 2009"

TL;DR: In this article, a systematic study of densities and refractive indices of 17 room temperature ionic liquids is presented at four different temperatures ranging from 293 K to 333 K. The ionic liquid are grouped into four families: 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [C n mim ][N tf 2 ], ionic fluids (with n ǫ = 2, 4, 6, 8, 10, 12, and 14); 1-ALKyl- 3-

TL;DR: In this paper, the densities and viscosities of pure ionic liquid were correlated successfully by empirical equations and the Vogel-Fulcher-Tammann equations can fit the experimental data of viscosity for pure IL.

TL;DR: In this article, the densities and viscosities of two pyridinium-based ionic liquids, 1-butylpyrinium tetrafluoroborate [BuPy][BF 4 ] and 1-octylprinium tetrafluorobite [OcPy], and their binaries with water at atmospheric pressure and temperatures from (283.15 to 348.15) K were determined.

TL;DR: In this article, experimental measurements of excess molar enthalpy, density, and isobaric molar heat capacity are presented for a set of binary systems ionic liquid+water as a function of temperature at atmospheric pressure.

TL;DR: In this article, the activity coefficients at infinite dilution, γ 13 ∞ for 32 solutes were determined by gas-liquid chromatography at the temperatures from 298.15 to 368.15 K.

TL;DR: In this article, the solubility of hydrogen sulfide in three ionic liquids, 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), 1- butyl- 3methyloride tetrafluoroborate (BF4), and 1-Butyl 3 methylimide bis(trifluoromethylsulfonyl)imide (Tf2N), at temperatures ranging from (303.15 to 343.15) K and pressures up to 1

TL;DR: In this paper, the relationship between density and refractive index of pure systems of ionic liquids was examined in the presence of atmospheric pressure and temperature up to 353.2 K. The results of this study can add to the newly organized database for ionic liquid and can also be used for various process design calculations.

TL;DR: In this paper, the alkyl chain length of 1-alkyl-3-methylimidazolium bromide (Rmim) was varied to prepare a series of room-temperature ionic liquids (RTILs), and experimental measurements of density and speed of sound at different temperatures ranging from (288.15 to 308.15) K for their aqueous and methanolic solutions in the dilute concentration region (0.30)

TL;DR: In this paper, the experimental solubility of CO 2 in six hydroxyl ammonium ionic liquids 2-hydroxyethanaminium acetate [hea], bis(2-hydroxethyl)ammoniumacetate [bheaa], 2hydroxy- N -(2hydroxyethyl)- N -methylethanaminium acyclic acid [hhemea] was determined and reported as a function of temperature and pressure.

TL;DR: In this article, a densimetric system for pVT measurements of compressed fluids, operating over the temperature range from 283.15 to 398.15 K and pressures up to 70 MPa, is presented.

TL;DR: In this paper, the adsorption of uranium (VI) from aqueous solutions onto natural sepiolite has been studied using a batch adsorber, and the experimental results were correlated reasonably well by the Langmuir ad-sorption isotherm and the Q o and b ) were calculated.

TL;DR: In this paper, the ERAS-model was applied in order to study the microscopic mechanisms involved in the mixing process of binary systems ionic liquid + n-nitromethane.

TL;DR: In this paper, measurements of density, viscosity, and refractive index of three pharmacologically significant drugs, i.e. diclofenac sodium, cetrizine, and doxycycline have been carried out in aqueous medium at T = (293.15 to 313.15) K.

TL;DR: In this article, the density, speed of sound, refractive index, and dynamic viscosity of the ionic liquids (ILs) 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, BMpyr NTf2, and trihexyl(tetradecyl) phosphonium dicyanamide, P66614 dca, were studied as a function of temperature at atmospheric pressure.

TL;DR: In this paper, the activity coefficients at infinite dilution, γ 13 ∞ for 36 solutes: alkanes, cycloalkanes, alkenes, alkynes, aromatic hydrocarbons, alcohols, thiophene, tetrahydrofuran, ethers, acetone, and water in the ionic liquid 4-methyl-N-butyl-pyridinium bis(trifluoromethylsulfonyl)-imide [bmPY][NTf2] were determined by gas-liquid chromatography at

TL;DR: In this article, the separation of benzene from aliphatic hydrocarbons (hexane, or heptane) is investigated by extraction with 1-ethyl-3-methylpyridinium ethylsulphate ionic liquid, [EMpy][ESO4].

TL;DR: In this article, the mutual immiscibility with an upper critical solution temperature (UCST) was detected at the very narrow and low mole fraction of the IL for the binary systems containing (imidazolium thiocyanate IL+thiophene).

TL;DR: In this article, aqueous solution of the room temperature protic ionic liquid (PIL), pyrrolidinium nitrate, was determined at the atmospheric pressure over the temperature range from (283.15 to 323.15) K and within the whole composition range.

TL;DR: In this paper, the authors measured the thermophysical properties of hydroxyl ammonium ionic liquids: density ρ, T ǫ = (293.15 to 363.15) K; dynamic viscosity η, T Â = (298.2 to 348.2) k; and refractive indices n D, Tǫ=(293.16 to 333.15 k).

TL;DR: In this article, the continuous development, present status, and potential of group contribution methods for the development of chemical processes is discussed, as well as their application in the field of process simulation.

TL;DR: In this article, experimental data for dissociation conditions of methane hydrates in the presence of 0.05 and 0.15 mass fractions CaBr2 aqueous solutions are reported.

TL;DR: In this article, the effects of temperature on the viscosities and Gibbs free energies of 1,2-ethanediol+1-nonanol were measured over a temperature range from (298.15 to 313.15) K. The effect of temperature is discussed in terms of variations of the structure of the system caused by the participation of two different alcohol molecules in the dynamic intermolecular association process through hydrogen bonding.

TL;DR: In this paper, the activity coefficients at infinite dilution, γ 13 ∞ for 32 solutes: alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, alcohols, thiophene, tetrahydrofuran, tert -butyl methyl ether, and water in the ionic liquid triethylsulphonium bis(trifluoromethylsulfonyl)imide [Et 3 S][NTf 2 ] were determined by gas-liquid chromatography at the temperatures from T

TL;DR: In this article, a study of the ionic liquid (IL) Ammoeng 102 (tetraalkyl ammonium sulfate) as solvent in liquid-liquid extraction was conducted.

TL;DR: In this paper, the densities of two binary mixtures formed by 1-butyl-3-methylimidazolium tetrafluoroborate [BF4] with compound N-methyl-2-pyrrolidinone have been determined over the full range of composition and range of temperature from (298.15 to 313.15)

TL;DR: In this article, the Pitzer-ion interaction and MNRTL electrolyte models satisfactorily correlate experimental osmotic coefficient data with good precision, and the parameters of Pitzerion interaction model are used to calculate the mean molal activity coefficients and excess Gibbs free energies.

TL;DR: In this paper, the volumetric properties of seven binary mixtures were studied as a function of temperature from (293 to 343) K and the phase behavior of the systems was first investigated using a nephelometric method and excess molar volumes were calculated from densities measured using an Anton Paar densimeter and fitted using a Redlich-Kister type equation.

TL;DR: In this paper, a Redlich-Kister equation was applied to correlate the excess properties such as: the excess molar volume and the excess Gibbs free energy of flow as functions of the DETA mole fraction and temperature.

TL;DR: In this article, the standard partial molar volumes, V 2 ∞ at infinite dilution of monosaccharides, have been determined in water and in aqueous solutions of potassium chloride (0.5, 1.0, 2.0 and 3.0) using a vibrating tube densimeter.

TL;DR: In this article, the authors present new solubility results for carbon dioxide in the ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate for temperatures ranging from (303.2 to 343.2) K and pressures up to 5.9 MPa using a thermogravimetric microbalance.