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Ana Rodríguez - One of the best experts on this subject based on the ideXlab platform.
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On the Use of Ionic Liquids to Separate Aromatic Hydrocarbons from a Model Soil
Separation Science and Technology, 2012Co-Authors: Ana B. Pereiro, Francisco J Deive, Ana RodríguezAbstract:The potential of exploiting ionic liquids (ILs) for an ex situ solvent aromatic extraction technique is envisaged in this work, due to the serious proportions reached by this kind of contaminants associated with the industrial progress. 1-butyl-1-Methylpyrrolidinium bis (trifluoroMethylsulfonyl) imide, tetraalkyl ammonium Sulfate, trihexyl (tetradecyl) phosphonium dicyanamide, 1-hexyl-3-Methylimidazolium hexafluorophosphate, 1,3-diMethylimidazolium Methyl Sulfate, and 1-butyl-3-Methylimidazolium Methyl Sulfate are proposed to efficiently extract benzene, toluene, and ethylbenzene at concentrations over the maximum allowable limit. The extraction procedure is completed with a washing and recycling step with the purpose of achieving a more competitive process.
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sodium carbonate as phase promoter in aqueous solutions of imidazolium and pyridinium ionic liquids
The Journal of Chemical Thermodynamics, 2011Co-Authors: Francisco J Deive, M A Rivas, Ana RodríguezAbstract:Abstract Several MethylSulfate and chloride anion-based ionic liquids, such as 1-alkyl-3-Methyl imidazolium Methyl Sulfate, C n MIM CH 3 SO 4 ( n = 1, 2, and 4), 1-benzyl-3-Methyl imidazolium Methyl Sulfate, BzMIM CH 3 SO 4 , 1-benzyl, or hexyl-3-Methyl imidazolium chloride, XMIM Cl (X = Bz and Hx), and Methylpyridinium MethylSulfate, Mpy CH 3 SO 4 , with sodium carbonate, Na 2 CO 3 , as phase forming salt, have been investigated and discussed for their potential use in separations based on aqueous two-phase systems (ATPS). Phase diagrams have been experimentally ascertained at T = 298.15 K, and Merchuck equation and a variation of this model have been used for correlating the binodal data. The alkyl chain length in the cation and the type of anion and cation have been explored and discussed due to their decisive influence in the ATPS behavior. The consistence of tie-line data was ascertained by applying the Othmer–Tobias and Bancroft equations.
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ternary liquid liquid equilibria ethanol 2 butanone 1 butyl 3 Methylimidazolium hexafluorophosphate 2 propanol 2 butanone 1 butyl 3 Methylimidazolium hexafluorophosphate and 2 butanone 2 propanol 1 3 diMethylimidazolium Methyl Sulfate at 298 15 k
Journal of Chemical & Engineering Data, 2007Co-Authors: Ana Pereiro B And, Ana RodríguezAbstract:This research is focused on a study of the ionic liquid as a solvent in liquid−liquid extraction of azeotropic mixtures. Liquid−liquid equilibria (LLE) were determined for the ternary systems ethanol + 2-butanone + 1-butyl-3-Methylimidazolium hexafluorophosphate ([BMIM][PF6]), 2-propanol + 2-butanone + [BMIM][PF6], and 2-butanone + 2-propanol + 1,3-diMethylimidazolium Methyl Sulfate ([MMIM][MeSO4]) at 298.15 K and atmospheric pressure. Selectivity and distribution ratio values, derived from the tie lines data, were calculated. Experimental LLE data were correlated by means of the nonrandom two-liquid, Othmer−Tobias, and Hand equations. The plait point compositions have been calculated by the Hand method.
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Liquid-liquid equilibria of 1,3-diMethylimidazolium Methyl Sulfate with ketones, dialkyl carbonates and acetates
Fluid Phase Equilibria, 2007Co-Authors: Ana B. Pereiro, José Canosa, Ana RodríguezAbstract:The liquid–liquid equilibria of several binary systems of 1,3-diMethylimidazolium Methyl Sulfate MMIM MeSO4 and dialkyl carbonates (diMethyl carbonate and diethyl carbonate), ketones (acetone, 2-butanone and 2-pentanone) or acetates (Methyl acetate and ethyl acetate) were studied from 278.15 K to close to the boiling temperature of the solvent. The liquid–liquid equilibrium of the ternary system of 2-butanone + ethanol + MMIM MeSO4 was carried out at 298.15 K and atmospheric pressure. Experimental liquid–liquid data are compared with the correlated values obtained by means of the NRTL equation. This model satisfactorily correlates the experimental data. © 2007 Elsevier B.V. All rights reserved.
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Physical Properties of 1-Butyl-3-Methylimidazolium Methyl Sulfate as a Function of Temperature
Journal of Chemical & Engineering Data, 2007Co-Authors: Ana B. Pereiro, Pedro Verdía, And Emilia Tojo, Ana RodríguezAbstract:Density, speed of sound, refractive index, dynamic viscosity, and surface tension measurements of 1-butyl-3-Methylimidazolium Methyl Sulfate have been made as a function of temperature. The synthesis of the ionic liquid is given. The low viscosity of the ionic liquid suggests its use as a solvent in the extraction process for the separation of azeotropic mixtures. The thermal expansion coefficient of the ionic liquid was calculated from the density, and the results are discussed. An analysis of the influence of the alkyl chain length of the cation on the density was performed by comparison with recently published values.
Ana B. Pereiro - One of the best experts on this subject based on the ideXlab platform.
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On the Use of Ionic Liquids to Separate Aromatic Hydrocarbons from a Model Soil
Separation Science and Technology, 2012Co-Authors: Ana B. Pereiro, Francisco J Deive, Ana RodríguezAbstract:The potential of exploiting ionic liquids (ILs) for an ex situ solvent aromatic extraction technique is envisaged in this work, due to the serious proportions reached by this kind of contaminants associated with the industrial progress. 1-butyl-1-Methylpyrrolidinium bis (trifluoroMethylsulfonyl) imide, tetraalkyl ammonium Sulfate, trihexyl (tetradecyl) phosphonium dicyanamide, 1-hexyl-3-Methylimidazolium hexafluorophosphate, 1,3-diMethylimidazolium Methyl Sulfate, and 1-butyl-3-Methylimidazolium Methyl Sulfate are proposed to efficiently extract benzene, toluene, and ethylbenzene at concentrations over the maximum allowable limit. The extraction procedure is completed with a washing and recycling step with the purpose of achieving a more competitive process.
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Liquid-liquid equilibria of 1,3-diMethylimidazolium Methyl Sulfate with ketones, dialkyl carbonates and acetates
Fluid Phase Equilibria, 2007Co-Authors: Ana B. Pereiro, José Canosa, Ana RodríguezAbstract:The liquid–liquid equilibria of several binary systems of 1,3-diMethylimidazolium Methyl Sulfate MMIM MeSO4 and dialkyl carbonates (diMethyl carbonate and diethyl carbonate), ketones (acetone, 2-butanone and 2-pentanone) or acetates (Methyl acetate and ethyl acetate) were studied from 278.15 K to close to the boiling temperature of the solvent. The liquid–liquid equilibrium of the ternary system of 2-butanone + ethanol + MMIM MeSO4 was carried out at 298.15 K and atmospheric pressure. Experimental liquid–liquid data are compared with the correlated values obtained by means of the NRTL equation. This model satisfactorily correlates the experimental data. © 2007 Elsevier B.V. All rights reserved.
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Physical Properties of 1-Butyl-3-Methylimidazolium Methyl Sulfate as a Function of Temperature
Journal of Chemical & Engineering Data, 2007Co-Authors: Ana B. Pereiro, Pedro Verdía, And Emilia Tojo, Ana RodríguezAbstract:Density, speed of sound, refractive index, dynamic viscosity, and surface tension measurements of 1-butyl-3-Methylimidazolium Methyl Sulfate have been made as a function of temperature. The synthesis of the ionic liquid is given. The low viscosity of the ionic liquid suggests its use as a solvent in the extraction process for the separation of azeotropic mixtures. The thermal expansion coefficient of the ionic liquid was calculated from the density, and the results are discussed. An analysis of the influence of the alkyl chain length of the cation on the density was performed by comparison with recently published values.
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Study on the phase behaviour and thermodynamic properties of ionic liquids containing imidazolium cation with ethanol at several temperatures
The Journal of Chemical Thermodynamics, 2007Co-Authors: Ana B. Pereiro, Ana RodríguezAbstract:Abstract Experimental densities, speeds of sound and refractive indices of the binary mixtures of ethanol with MMIM MeSO4 (1,3-diMethylimidazolium Methyl Sulfate), BMIM MeSO4 (1-butyl-3-Methylimidazolium Methyl Sulfate), BMIM PF6 (1-butyl-3-Methylimidazolium hexafluorophosphate), HMIM PF6 (1-hexyl-3-Methylimidazolium hexafluorophosphate) and OMIM PF6 (1-Methyl-3-octylimidazolium hexafluorophosphate) were determined from T = (293.15 to 303.15) K. Excess molar volumes, changes of refractive index on mixing and deviations in isentropic compressibility for the above systems were calculated. The (liquid + liquid) equilibrium (LLE) data of (IL + ethanol) were carried out experimentally and the NRTL and UNIQUAC correlative equation was applied to these mixtures.
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Temperature Dependence of Physical Properties of Ionic Liquid 1,3-DiMethylimidazolium Methyl Sulfate
Journal of Chemical & Engineering Data, 2006Co-Authors: Ana B. Pereiro, Francisco Santamarta, Emilia Tojo, Ana Rodríguez, Jose TojoAbstract: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.
Deresh Ramjugernath - One of the best experts on this subject based on the ideXlab platform.
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influence of temperature on thermophysical properties of tri butyl Methylphosphonium Methyl Sulfate n Methyl 2 pyrrolidone
Journal of Molecular Liquids, 2017Co-Authors: Reddicherla Umapathi, Deresh Ramjugernath, Pannuru VenkatesuAbstract:Abstract In this work, densities (ρ), ultrasonic sound velocities (u) and viscosities (η) for binary mixture of tri(butyl)Methylphosphonium Methyl Sulfate ([P4441][CH3SO4]) with N-Methyl-2-pyrrolidone (NMP) were measured over the entire composition range at temperatures ranging from 293.15 to 323.15 K in steps of 5 K under atmospheric pressure. The derived properties such as excess molar volumes (VE), deviation in isentropic compressibilities (Δκs) and deviation in viscosities (Δη) are obtained from ρ, u and η data, respectively. The derived properties were correlated accurately with the Redlich-Kister type equation. The VE, Δκs and Δη values for the aforesaid systems are negative over the entire composition range under the present experimental conditions. The molecular interactions and structural effects were examined on the basis of measured and derived properties. The obtained results are useful for describing the intermolecular interactions, developing structure-property correlation and molecular modeling that exist between [P4441][CH3SO4] with NMP mixture.
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Influence of temperature on thermophysical properties of tri(butyl)Methylphosphonium Methyl Sulfate + N-Methyl-2-pyrrolidone
Journal of Molecular Liquids, 2017Co-Authors: Reddicherla Umapathi, Deresh Ramjugernath, Pannuru VenkatesuAbstract:Abstract In this work, densities (ρ), ultrasonic sound velocities (u) and viscosities (η) for binary mixture of tri(butyl)Methylphosphonium Methyl Sulfate ([P4441][CH3SO4]) with N-Methyl-2-pyrrolidone (NMP) were measured over the entire composition range at temperatures ranging from 293.15 to 323.15 K in steps of 5 K under atmospheric pressure. The derived properties such as excess molar volumes (VE), deviation in isentropic compressibilities (Δκs) and deviation in viscosities (Δη) are obtained from ρ, u and η data, respectively. The derived properties were correlated accurately with the Redlich-Kister type equation. The VE, Δκs and Δη values for the aforesaid systems are negative over the entire composition range under the present experimental conditions. The molecular interactions and structural effects were examined on the basis of measured and derived properties. The obtained results are useful for describing the intermolecular interactions, developing structure-property correlation and molecular modeling that exist between [P4441][CH3SO4] with NMP mixture.
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Liquid–Liquid Equilibria for Mixtures of Hexadecane and Ethanol with Imidazolium-Based Ionic Liquids
Journal of Solution Chemistry, 2015Co-Authors: Niren Mungar Ram, Paramespri Naidoo, Indra Bahadur, Trevor M. Letcher, Deresh RamjugernathAbstract:The applicability of 1-alkyl-imidazoluim-based ionic liquids (ILs) for the extraction of ethanol from hexadecane by solvent extraction was studied by determining the liquid–liquid equilibrium (LLE) data for the ternary systems: {hexadecane (1) + ethanol (2) + 1,3-diMethylimidazolium Methyl Sulfate, [MMIM][MeSO4] (3) or 1-ethyl-3-Methylimidazolium Methyl Sulfate, [EMIM][MeSO4] (3), or 1-butyl-3-Methylimidazolium Methyl Sulfate, [BMIM][MeSO4] (3)} at T = 298.15 K and p = 1 atm. The selectivities and distribution coefficients of the solute, derived from the measured tie-line data, were used to examine the ability of these ILs as solvents to extract ethanol from a hexadecane-ethanol mixture. The temperature dependency was investigated by measuring the LLE data for {hexadecane (1) + ethanol (2) + [MMIM][MeSO4] (3)} at T = 313.15 K and p = 1 atm. The Othmer–Tobias and Hand equations were used to establish the quality of the LLE data. Finally, the experimental tie-line data were correlated using the Non-Random Two Liquid model.
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Solubilities of Carbon Dioxide and Oxygen in the Ionic Liquids Methyl Trioctyl Ammonium Bis(trifluoroMethylsulfonyl)imide, 1-Butyl-3-Methyl Imidazolium Bis(trifluoroMethylsulfonyl)imide, and 1-Butyl-3-Methyl Imidazolium Methyl Sulfate
The journal of physical chemistry. B, 2015Co-Authors: Indra Bahadur, Khalid Osman, Christophe Coquelet, Paramespri Naidoo, Deresh RamjugernathAbstract:Ionic liquids (ILs) are being considered as solvents for gas absorption processes as they have the potential, in general, for improved efficiency of gas separations, as well as lower capital and operating costs compared to current commercial processes. In this study the solvent properties of ILs are investigated for use in the absorption of carbon dioxide (CO2) and oxygen (O2). The absorption of these gases in ILs was measured in the temperature range 303.15-333.15 K and at pressures up to 1.5 MPa by gravimetric analysis. The ILs used were Methyl trioctyl ammonium bis (trifluoroMethylsulfonyl) imide ([MOA][Tf2N]), 1-butyl-3-Methyl imidazolium bis (trifluoroMethylsulfonyl) imide ([BMIM][Tf2N]), and 1-butyl-3-Methyl imidazolium Methyl Sulfate ([BMIM][MeSO4]). The measurement technique employed in this study is fast and accurate, and requires small quantities of solvent. The results indicated that absorption of both gases increased with a decrease in operating temperature and an increase in pressure. [MOA][Tf2N] had the highest CO2 and O2 solubility. [BMIM][Tf2N] was determined to have the highest selectivity for CO2 absorption. [BMIM][MeSO4] achieved the lowest CO2 absorption with a moderate O2 absorption, revealing this IL to be the least desirable for CO2 and O2 absorption. Calculation of Henry's law constants for all systems confirmed the deductions made from absorption data analysis. Calculation of enthalpy and entropy of absorption for each system revealed CO2 absorption in [MOA][Tf2N] to be the least sensitive to temperature increases. The absorption data was modeled using the generic Redlich-Kwong cubic equation of state (RK-EOS) coupled with a group contribution method.
Ivan A. Novakov - One of the best experts on this subject based on the ideXlab platform.
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Multicomponent flocculating systems based on cationic polyelectrolytes
Russian Journal of Applied Chemistry, 2009Co-Authors: Zh. N. Malysheva, A. V. Navrotskii, S. S. Dryabina, A. V. Kuptsov, Yu. S. Zubreva, Ivan A. NovakovAbstract:The kinetics of sedimentation of aqueous kaolin dispersion in the presence of multicomponent flocculating additives was studied. Binary and ternary mixtures based on poly-1,2-diMethyl-5-vinylpyridinium Methyl Sulfate, poly-N,N-diMethyl-N,N-diallylammonium chloride, and poly-N,N,N-triMethyl-N-methacryloyloxyethylammonium Methyl Sulfate were used as flocculants. The synergistic effect of the cationic polyelectrolytes in such multicomponent systems was revealed.
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Purification of fat-containing wastewater with a complex based on poly-N,N,N,N-triMethyl[methacryloyloxyethyl]ammonium Methyl Sulfate and sodium dodecyl Sulfate
Russian Journal of Applied Chemistry, 2009Co-Authors: Yu. V. Shulevich, A. V. Navrotskii, T. Kh. Nguen, Ivan A. NovakovAbstract:Possibility of using complexes based on poly-N,N,N,N-triMethyl[methacryloyloxyethyl]ammonium Methyl Sulfate and sodium dodecyl Sulfate for purification of fat-containing wastewater was examined.
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Influence of the lyophilizing power of the polymer chain on the relationships in formation of polyelectrolyte-surfactant complexes
Russian Journal of Applied Chemistry, 2008Co-Authors: Yu. V. Shulevich, A. V. Navrotskii, O. Yu. Kovaleva, V. G. Skrebneva, Ivan A. NovakovAbstract:Viscometry and turbidimetry were applied to examine the relationships in formation of complexes by poly-1,2-diMethyl-5-vinylpyridinium Methyl Sulfate, poly-N,N,N,N-triMethyl(methacryloyloxyethyl)ammonium Methyl Sulfate, and poly[N-benzyl-N,N-diMethyl-N-(methacryloyloxyethyl)]ammonium chloride with sodium dodecyl Sulfate.
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Synthesis of Polymer-Colloid Complexes by Polymerization of Ionic Monomers in a Surfactant Solution
Russian Journal of Applied Chemistry, 2005Co-Authors: Yu. V. Shulevich, A. V. Navrotskii, V. A. Navrotskii, O. Yu. Kovaleva, Ivan A. NovakovAbstract:The possibility of synthesis of polymer-colloid complexes by polymerization of 1,2-diMethyl-5-vinylpyridinium Methyl Sulfate and N,N,N,N-triMethyl(methacryloyloxyethyl)ammonium Methyl Sulfate in a solution of sodium dodecyl Sulfate was examined.
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Specific features of 1,2-diMethyl-5-vinylpyridinium Methyl Sulfate polymerization in the presence of α-amino acids
Polymer Science Series B, 2003Co-Authors: A. V. Navrotskii, S. M. Makeev, V. A. Navrotskii, M. V. Orlyanskii, Ivan A. NovakovAbstract:The specific features of the free-radical polymerization of 1,2-diMethyl-5-vinylpyridinium Methyl Sulfate initiated by tert-butylperoxypropanol-2 in the presence of a amino acids are considered. The use of amino acids affects the polymerization rate and the reaction order in the initiator concentration, as well as the molecular mass of the resulting polymer; the dependences of the polymerization rate and the molecular mass on the amino acid concentration have an extreme pattern. Amino acids are presumed to participate in reactions of radical center transfer from primary radicals and macroradicals; under certain concentration conditions, this behavior of amino acids can reduce the rate of chain termination and, accordingly, can accelerate polymerization and afford a higher molecular mass polymer.
Gerd Maurer - One of the best experts on this subject based on the ideXlab platform.
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Activity Coefficients at Infinite Dilution of Alkanols in the Ionic Liquids 1-Butyl-3-Methylimidazolium Hexafluorophosphate, 1-Butyl-3-Methylimidazolium Methyl Sulfate, and 1-Hexyl-3-Methylimidazolium Bis(trifluoroMethylsulfonyl) Amide Using the Dilu
Journal of Chemical & Engineering Data, 2008Co-Authors: Yuri Dobryakov, Dirk Tuma, Gerd MaurerAbstract:Activity coefficients at infinite dilution were measured for eight alkanols (methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, 2-Methyl-1-propanol, and 2-Methyl-2-propanol) in the three ionic liquids 1-butyl-3-Methylimidazolium hexafluorophosphate ([bmim][PF6]), 1-butyl-3-Methylimidazolium Methyl Sulfate ([bmim][CH3SO4]), and 1-hexyl-3-Methylimidazolium bis(trifluoroMethylsulfonyl) amide ([hmim][Tf2N]) between (293.15 and 353.15) K using the dilutor technique. The results are presented and, as far as possible, compared with literature data.
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Phase Equilibrium of Aqueous Systems Containing 3-Methyl-1-vinylimidazolium Methyl Sulfate
Journal of Chemical & Engineering Data, 2007Co-Authors: Natalia Fedicheva, Luciana Ninni, Gerd MaurerAbstract:This paper reports experimental data for the activity of water in aqueous solutions of 3-Methyl-1-vinylimidazolium Methyl Sulfate (QVI) at (298 and 338) K and the solid−liquid equilibrium for the ternary system (QVI + sodium Sulfate + water) at the same temperatures. QVI is an ionic monomer which is gaining importance as a monomer for water-soluble polymers. The experimental data presented here are to contribute to a database which is needed to develop and test thermodynamic models for the description/prediction of phase equilibrium in aqueous solutions of such polyelectrolytes. The new experimental results for the activity of water are described by the VERS model of Groβmann et al. for the excess Gibbs energy of aqueous solutions. Two interaction parameters were adjusted to correlate that data. The data set comprising the solid−liquid equilibrium was used for determining another set of interaction parameters (between that vinylimidazolium salt and sodium Sulfate).