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Iran Alemzadeh - One of the best experts on this subject based on the ideXlab platform.
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partitioning of l lysine monohydrochloride in aqueous two phase systems of poly ethylene glycol and Dipotassium Hydrogen Phosphate or trisodium citrate 5 hydrate
Journal of Chemical & Engineering Data, 2010Co-Authors: Mona Mirsiaghi, Gholamreza Pazuki, Manouchehr Vossoughi, Iran AlemzadehAbstract:The partition constants of L-lysine HCl were measured in polymer—salt aqueous two-phase systems. These systems contain poly(ethylene glycol) with a nominal molecular weight of 4000 or 10000 and two different salts (Dipotassium Hydrogen Phosphate or trisodium citrate 5-hydrate). The experimental data were obtained at temperatures of (293.15, 298.15, and 303.15) K. The effects of temperature, pH, polymer and salt concentrations, polymer molecular weight, and salt type on the partitioning of L-lysine HCl were also studied. The results showed that salt concentration has a significant effect on the partition constant while temperature has less effect. The Diamond and Hsu model was used to correlate the experimental partition constants of L-lysine HCl.
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partitioning of l lysine monohydrochloride in aqueous two phase systems of poly ethylene glycol and Dipotassium Hydrogen Phosphate or trisodium citrate 5 hydrate
Journal of Chemical & Engineering Data, 2010Co-Authors: Mona Mirsiaghi, Gholamreza Pazuki, Manouchehr Vossoughi, Iran AlemzadehAbstract:The partition constants of l-lysine HCl were measured in polymer−salt aqueous two-phase systems. These systems contain poly(ethylene glycol) with a nominal molecular weight of 4000 or 10000 and two...
Sholeh Hamzehzadeh - One of the best experts on this subject based on the ideXlab platform.
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liquid liquid equilibria of aqueous biphasic systems of ionic liquids and Dipotassium Hydrogen Phosphate at different temperatures experimental study and thermodynamic modeling
Journal of Molecular Liquids, 2016Co-Authors: Sepandar Malekghasemi, Babak Mokhtarani, Sholeh Hamzehzadeh, Ali Sharifi, Mojtaba MirzaeiAbstract:Abstract The phase diagrams of the {1-butyl-3-methylimidazolium nitrate ([Bmim][NO 3 ]) / 1-hexyl-3-methylimidazolium nitrate ([Hmim][NO 3 ]) + Dipotassium Hydrogen Phosphate (K 2 HPO 4 )}c aqueous biphasic systems (ABS) and the binodal curves of {1-octyl-3-methylimidazolium nitrate ([Omim][NO 3 ]) + K 2 HPO 4 } ABS have been determined experimentally at T = (288.15, 298.15, and 308.15) K. The Merchuk equation with three dependent-temperature adjustable parameters was used for reproducing and predicting the binodal curves. The effect of the alkyl chain length of ionic liquids (ILs) was studied. It was found that the two-phase formation in the investigated ABS is decreased with decreasing the alkyl chain length of IL in the order: [Hmim][NO 3 ] > [Omim][NO 3 ] > [Bmim][NO 3 ]. Moreover, the effect of temperature on the binodal curves and tie-lines was also discussed. It was shown that the biphasic region expanded with a decrease in temperature, whereas the absolute value of slope of the tie-lines slightly decreased with an increase in temperature. Finally, the liquid–liquid equilibrium (LLE) data for the studied systems are correlated by using the NRTL thermodynamic model, and good agreement was obtained between the correlation and the experimental data.
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liquid liquid equilibria of aqueous two phase systems containing 1 butyl 3 methylimidazolium bromide and potassium Phosphate or Dipotassium Hydrogen Phosphate at 298 15 k
Journal of Chemical & Engineering Data, 2007Co-Authors: Sholeh HamzehzadehAbstract:Liquid−liquid equilibria (LLE) for the aqueous 1-butyl-3-methylimidazolium bromide, [C4mim]Br, + potassium Phosphate and [C4mim]Br + Dipotassium Hydrogen Phosphate systems have been determined experimentally at 298.15 K. The effect of the type of salt on the binodal and tie-lines has been studied on the basis of effective excluded volume values of the salt obtained from fitting the binodal data to the binodal model and Gibbs free energy of hydration of the constituent ions. Furthermore, the extended NRTL model has been used for the correlation of the obtained tie-line data. The six binary adjustable model parameters for this local composition model have been estimated either simultaneously from correlation of the experimental tie-line data or in the calculation; the model parameters between ionic liquid and water or between salt and water have been initially correlated with the vapor−liquid equilibrium (VLE) of the corresponding binary systems, and then those between ionic liquid and salt have been correl...
Harsh Kumar - One of the best experts on this subject based on the ideXlab platform.
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volumetric acoustic and viscometric behaviour of Dipotassium Hydrogen Phosphate and disodium Hydrogen Phosphate in aqueous solution of n acetyl glycine at different temperatures
The Journal of Chemical Thermodynamics, 2016Co-Authors: Harsh Kumar, Meenu Singla, Heena MittalAbstract:Abstract Densities, speeds of sound and viscosities of Dipotassium Hydrogen Phosphate (DPHP) and disodium Hydrogen Phosphate (DSHP) in aqueous solutions of N-acetyl glycine (AcGly) are reported at different temperatures. Densities and speeds of sound have been used to calculate apparent molar volume, apparent molar isentropic compression, partial molar volume, partial molar isentropic compression, partial molar volume of transfer, partial molar isentropic compression of transfer and partial molar expansivity. Pair and triplet interaction coefficients have also been calculated. Experimental viscosities have been used to determine B-coefficients. Further pair and triplet interaction coefficients have also been calculated. The results are discussed in terms of solute–solvent interactions.
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Interionic Interactions of Aqueous Mixtures of Ionic Liquid 1‑Hexyl-3-methylimidazolium Chloride with Phosphate Salts at T = (288.15 to 308.15) K: Volumetric, Acoustic and UV Absorption Studies
2015Co-Authors: Harsh Kumar, Chanda ChadhaAbstract:The interactions of Phosphate salts like disodium Hydrogen Phosphate (Na2HPO4) and Dipotassium Hydrogen Phosphate (K2HPO4) with 1-hexyl-3-methylimidazolium chloride ([C6mim][Cl]) as a function of temperature have been investigated by combination of volumetric and acoustic measurements. Densities, ρ, and speeds of sound, u, for Phosphate salts in aqueous solutions of 1-hexyl-3-methylimidazolium chloride have been measured at T = (288.15, 293.15, 298.15, 303.15, 308.15) K and atmospheric pressure. The apparent molar volume, limiting apparent molar volume and standard partial molar volumes of transfer for Phosphate salts from water to aqueous 1-hexyl-3-methylimidazolium chloride solutions have been calculated from density data. Apparent molar isentropic compression, limiting apparent molar isentropic compression and standard partial molar isentropic compression of transfer have been calculated from speeds of sound data. The UV absorption studies have also made in this study. The results have been explained in terms of competing patterns of interactions of cosolvent and the solute
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viscosities of glycine and l alanine in 0 2 0 4 0 6 and 0 8 mol kg 1 aqueous Dipotassium Hydrogen Phosphate solutions at different temperatures
Journal of Chemical & Engineering Data, 2012Co-Authors: Harsh Kumar, Kirtanjot KaurAbstract:Viscosities, η, for glycine and l-alanine have been measured in (0.2, 0.4, 0.6, and 0.8) mol·kg–1 aqueous Dipotassium Hydrogen Phosphate (DKHP) solutions at temperatures T = (288.15, 298.15, 308.15, and 318.15) K. The change in viscosity of amino acids with an increase in DKHP concentration and temperature is attributed to amino acid–DKHP interactions. The viscosity B-coefficients and viscosity interaction parameters obtained from the Jones–Dole equation and transition state theory, respectively, have been discussed to interpret interactions between ions of amino acids and Dipotassium Hydrogen Phosphate.
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effect of Dipotassium Hydrogen Phosphate on thermodynamic properties of glycine and l alanine in aqueous solutions at different temperatures
The Journal of Chemical Thermodynamics, 2012Co-Authors: Harsh Kumar, Kirtanjot KaurAbstract:Abstract Densities, ρ, speed of sound, u for glycine, l -alanine have been measured in aqueous solutions of Dipotassium Hydrogen Phosphate (DKHP) ranging from 0.2, 0.4, 0.6 and 0.8 mol·kg−1 at temperatures T = (288.15, 298.15, 308.15 and 318.15) K. The different parameters such as apparent molar volume, limiting apparent molar volume, transfer volume, partial molar expansibility have been derived from density data. Experimental speeds of sound data were used to estimate apparent molar adiabatic compressibility, limiting apparent molar adiabatic compressibility, transfer parameter and hydration number. These parameters have been discussed in the light of ion-ion and ion-solvent interactions.
Ana Rodriguez - One of the best experts on this subject based on the ideXlab platform.
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liquid liquid equilibrium of aqueous biphasic systems composed of 1 benzyl or 1 hexyl 3 methylimidazolium chloride ionic liquids and inorganic salts
The Journal of Chemical Thermodynamics, 2012Co-Authors: Francisco J Deive, Ana RodriguezAbstract:Abstract (Liquid + liquid) equilibria for {1-benzyl-3-methylimidazolium chloride ([BzMIM]Cl) or 1-hexyl-3-methylimidazolium chloride ([HMIM]Cl) + inorganic salts (potassium Phosphate K3PO4, potassium carbonate K2CO3, or Dipotassium Hydrogen Phosphate K2HPO4) + H2O} aqueous biphasic systems (ABSs) are presented at T = 298.15 K. An empirical equation was used to correlate the binodal data. The experimental tie lines were appropriately correlated by the Othmer–Tobias and Brancroft empirical equations. The influence of the selected inorganic salts in the phase segregation was investigated by means the calculated effective excluded volume (EEV) and Setschenow-type equation. The salting-out ability of salts was also evaluated in terms of the Gibbs energy of hydration of salt (ΔGhyd) and assessed with EEV values.
Mona Mirsiaghi - One of the best experts on this subject based on the ideXlab platform.
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partitioning of l lysine monohydrochloride in aqueous two phase systems of poly ethylene glycol and Dipotassium Hydrogen Phosphate or trisodium citrate 5 hydrate
Journal of Chemical & Engineering Data, 2010Co-Authors: Mona Mirsiaghi, Gholamreza Pazuki, Manouchehr Vossoughi, Iran AlemzadehAbstract:The partition constants of L-lysine HCl were measured in polymer—salt aqueous two-phase systems. These systems contain poly(ethylene glycol) with a nominal molecular weight of 4000 or 10000 and two different salts (Dipotassium Hydrogen Phosphate or trisodium citrate 5-hydrate). The experimental data were obtained at temperatures of (293.15, 298.15, and 303.15) K. The effects of temperature, pH, polymer and salt concentrations, polymer molecular weight, and salt type on the partitioning of L-lysine HCl were also studied. The results showed that salt concentration has a significant effect on the partition constant while temperature has less effect. The Diamond and Hsu model was used to correlate the experimental partition constants of L-lysine HCl.
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partitioning of l lysine monohydrochloride in aqueous two phase systems of poly ethylene glycol and Dipotassium Hydrogen Phosphate or trisodium citrate 5 hydrate
Journal of Chemical & Engineering Data, 2010Co-Authors: Mona Mirsiaghi, Gholamreza Pazuki, Manouchehr Vossoughi, Iran AlemzadehAbstract:The partition constants of l-lysine HCl were measured in polymer−salt aqueous two-phase systems. These systems contain poly(ethylene glycol) with a nominal molecular weight of 4000 or 10000 and two...