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Kesharsingh J Patil - One of the best experts on this subject based on the ideXlab platform.
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studies of Osmotic and activity Coefficient properties of aqueous solutions of triethylammonium formate and triethylammonium glycolate protic ionic liquids at 298 15 k
Journal of Molecular Liquids, 2021Co-Authors: Kunal R Patil, Vasim R Shaikh, Dilip H Dagade, Sarika K Patil, Kesharsingh J PatilAbstract:Abstract The triethylammonium-based carboxylate protic ionic liquids (PILs) are called as truly bio-ionic liquids. They can be used as green solvent, additives (biphasic catalysis) and for other considerable effects involving nano-material specially related to biomolecules. In this work, Osmotic Coefficient (φ) measurements using vapor pressure osmometry technique for aqueous solutions of two PILs, namely, triethylammonium formate [TEAF] (0.01290–0.55988 mol·kg−1) and triethylammonium glycolate [TEAG] (0.00989–0.53176 mol·kg−1) have been reported at 298.15 K. The water activity (aw) and solvent activity Coefficient (γ1), mean molal activity Coefficient (γ±) of PILs and Osmotic pressure (π) of solutions properties in a binary mixture, were determined using experimentally measured φ data. The analysis of Osmotic pressure data revealed that the studied PILs are electrolytes in the limit of infinite dilution and yield correct molecular weights as well as show negative values for virial Coefficients. The variations of Osmotic Coefficient and mean molal activity Coefficient of studied PILs with concentration indicate positive deviations from Debye-Huckel limiting law similar to that of ammonium ions. Further, Gibbs free energy changes due to mixing (ΔGm) and excess Gibbs free energy changes (ΔGE) for the studied binary systems are estimated. The solute-solute virial Coefficient (NB22∗0) for the studied PILs in aqueous solutions were estimated by an application of the McMillan−Mayer theory of solutions. The results indicate that the hydration effect is dominant in PILs through the cooperative H–bonding with water-structure making effect suggesting the significance of hydrophobic hydration as observed in tetraalkylammonium salts and aprotic ionic liquids. A need to study the water molecule splitting at nitrogen charge centre and possible attenuation of water structural effects due to hydrophobic moieties present in the molecule is emphasized.
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thermodynamic studies of aqueous solutions of 2 2 2 cryptand at 298 15 k enthalpy entropy compensation partial entropies and complexation with k ions
Journal of Physical Chemistry B, 2013Co-Authors: Vasim R Shaikh, Santosh S Terdale, Abdul Ahamad, Gaurav R Gupta, Dilip H Dagade, D G Hundiwale, Kesharsingh J PatilAbstract:Abstract The Osmotic Coefficient measurements for binary aqueous solutions of 2,2,2-cryptand (4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8] hexacosane) in the concentration range of ~0.009 to ~0.24 mol·kg(-1) and in ternary aqueous solutions containing a fixed concentration of 2,2,2-cryptand of ~0.1 mol·kg(-1) with varying concentration of KBr (~0.06 to ~0.16 mol·kg(-1)) have been reported at 298.15 K. The diamine gets hydrolyzed in aqueous solutions and needs proper approach to obtain meaningful thermodynamic properties. The measured Osmotic Coefficient values are corrected for hydrolysis and are used to determine the solvent activity and mean ionic activity Coefficients of solute as a function of concentration. Strong ion-pair formation is observed, and the ion-pair dissociation constant for the species [CrptH](+)[OH(-)] is reported. The excess and mixing thermodynamic properties (Gibbs free energy, enthalpy, and entropy changes) have been obtained using the activity data from this study and the heat data reported in the literature. Further, the data are utilized to compute the partial molal entropies of solvent and solute at finite as well as infinite dilution of 2,2,2-cryptand in water. The concentration dependent non-linear enthalpy-entropy compensation effect has been observed for the studied system, and the compensation temperature along with entropic parameter are reported. Using solute activity Coefficient data in ternary solutions, the transfer Gibbs free energies for transfer of the cryptand from water to aqueous KBr as well as transfer of KBr from water to aqueous cryptand were obtained and utilized to obtain the salting constant (ks) and thermodynamic equilibrium constant (log K) values for the complex (2,2,2-cryptand:K(+)) at 298.15 K. The value of log K = 5.8 ± 0.1 obtained in this work is found to be in good agreement with that reported by Lehn and Sauvage. The standard molar entropy for complexation is also estimated for the 2,2,2-cryptand-KBr complex in aqueous medium.
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activity and activity Coefficient studies of aqueous binary solutions of procaine lidocaine and tetracaine hydrochloride at 298 15 k
Journal of Chemical & Engineering Data, 2012Co-Authors: Vasim R Shaikh, Santosh S Terdale, Dilip H Dagade, D G Hundiwale, Kesharsingh J PatilAbstract:Osmotic Coefficient and density measurements are reported for the aqueous solutions of three hydrochloride salts of local anesthetical drug compounds, procaine (PC·HCl), lidocaine (LC·HCl), and tetracaine (TC·HCl) at 298.15 K and at ambient pressure. The experimental Osmotic Coefficient data are used to determine the activity and mean ionic activity Coefficients of solute and solvent, respectively. The activity data have been processed to obtain the mixing and excess thermodynamic properties, such as Gibbs free energy (which has been studied as a function of drug concentration), as well as to obtain the Osmotic pressure and Osmotic virial Coefficients of the drug compounds. The mean ionic activity Coefficients of the ions decrease with the increase in drug concentration. The results of mixing and excess free energy changes do not show abrupt changes. These results are examined from the point of view of premiceller (associative) equilibria and the occurrence of critical micelle concentration (cmc). A discu...
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studies of enthalpy entropy compensation partial entropies and kirkwood buff integrals for aqueous solutions of glycine l leucine and glycylglycine at 298 15 k
Journal of Physical Chemistry B, 2009Co-Authors: Deepti N Kurhe, Dilip H Dagade, Jyoti P Jadhav, Sanjay P Govindwar, Kesharsingh J PatilAbstract:Densities and Osmotic Coefficient measurements for dilute aqueous solutions of glycine, l-leucine, and glycylglycine have been reported at 298.15 K. The partial molar volumes and activity Coefficients of solute as well as solvent have been estimated using the density and Osmotic Coefficient data, respectively. Excess and mixing thermodynamic properties, such as Gibbs free energy, enthalpy, and entropy changes, have been obtained using the activity data from this study and the heat data reported in the literature. The concentration enthalpy−entropy compensation effects have been observed for the studied systems, and the compensation temperatures are reported. It has been observed that the excess free energy change for all the studied systems is almost the same over the studied concentration range, showing that the differences in properties of such solutions are largely decided by the enthalpy−entropy effects. These results, along with partial entropy data, show the effects of the presence of hydrophobic in...
Dilip H Dagade - One of the best experts on this subject based on the ideXlab platform.
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studies of Osmotic and activity Coefficient properties of aqueous solutions of triethylammonium formate and triethylammonium glycolate protic ionic liquids at 298 15 k
Journal of Molecular Liquids, 2021Co-Authors: Kunal R Patil, Vasim R Shaikh, Dilip H Dagade, Sarika K Patil, Kesharsingh J PatilAbstract:Abstract The triethylammonium-based carboxylate protic ionic liquids (PILs) are called as truly bio-ionic liquids. They can be used as green solvent, additives (biphasic catalysis) and for other considerable effects involving nano-material specially related to biomolecules. In this work, Osmotic Coefficient (φ) measurements using vapor pressure osmometry technique for aqueous solutions of two PILs, namely, triethylammonium formate [TEAF] (0.01290–0.55988 mol·kg−1) and triethylammonium glycolate [TEAG] (0.00989–0.53176 mol·kg−1) have been reported at 298.15 K. The water activity (aw) and solvent activity Coefficient (γ1), mean molal activity Coefficient (γ±) of PILs and Osmotic pressure (π) of solutions properties in a binary mixture, were determined using experimentally measured φ data. The analysis of Osmotic pressure data revealed that the studied PILs are electrolytes in the limit of infinite dilution and yield correct molecular weights as well as show negative values for virial Coefficients. The variations of Osmotic Coefficient and mean molal activity Coefficient of studied PILs with concentration indicate positive deviations from Debye-Huckel limiting law similar to that of ammonium ions. Further, Gibbs free energy changes due to mixing (ΔGm) and excess Gibbs free energy changes (ΔGE) for the studied binary systems are estimated. The solute-solute virial Coefficient (NB22∗0) for the studied PILs in aqueous solutions were estimated by an application of the McMillan−Mayer theory of solutions. The results indicate that the hydration effect is dominant in PILs through the cooperative H–bonding with water-structure making effect suggesting the significance of hydrophobic hydration as observed in tetraalkylammonium salts and aprotic ionic liquids. A need to study the water molecule splitting at nitrogen charge centre and possible attenuation of water structural effects due to hydrophobic moieties present in the molecule is emphasized.
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thermodynamic studies of aqueous solutions of 2 2 2 cryptand at 298 15 k enthalpy entropy compensation partial entropies and complexation with k ions
Journal of Physical Chemistry B, 2013Co-Authors: Vasim R Shaikh, Santosh S Terdale, Abdul Ahamad, Gaurav R Gupta, Dilip H Dagade, D G Hundiwale, Kesharsingh J PatilAbstract:Abstract The Osmotic Coefficient measurements for binary aqueous solutions of 2,2,2-cryptand (4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8.8.8] hexacosane) in the concentration range of ~0.009 to ~0.24 mol·kg(-1) and in ternary aqueous solutions containing a fixed concentration of 2,2,2-cryptand of ~0.1 mol·kg(-1) with varying concentration of KBr (~0.06 to ~0.16 mol·kg(-1)) have been reported at 298.15 K. The diamine gets hydrolyzed in aqueous solutions and needs proper approach to obtain meaningful thermodynamic properties. The measured Osmotic Coefficient values are corrected for hydrolysis and are used to determine the solvent activity and mean ionic activity Coefficients of solute as a function of concentration. Strong ion-pair formation is observed, and the ion-pair dissociation constant for the species [CrptH](+)[OH(-)] is reported. The excess and mixing thermodynamic properties (Gibbs free energy, enthalpy, and entropy changes) have been obtained using the activity data from this study and the heat data reported in the literature. Further, the data are utilized to compute the partial molal entropies of solvent and solute at finite as well as infinite dilution of 2,2,2-cryptand in water. The concentration dependent non-linear enthalpy-entropy compensation effect has been observed for the studied system, and the compensation temperature along with entropic parameter are reported. Using solute activity Coefficient data in ternary solutions, the transfer Gibbs free energies for transfer of the cryptand from water to aqueous KBr as well as transfer of KBr from water to aqueous cryptand were obtained and utilized to obtain the salting constant (ks) and thermodynamic equilibrium constant (log K) values for the complex (2,2,2-cryptand:K(+)) at 298.15 K. The value of log K = 5.8 ± 0.1 obtained in this work is found to be in good agreement with that reported by Lehn and Sauvage. The standard molar entropy for complexation is also estimated for the 2,2,2-cryptand-KBr complex in aqueous medium.
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activity and activity Coefficient studies of aqueous binary solutions of procaine lidocaine and tetracaine hydrochloride at 298 15 k
Journal of Chemical & Engineering Data, 2012Co-Authors: Vasim R Shaikh, Santosh S Terdale, Dilip H Dagade, D G Hundiwale, Kesharsingh J PatilAbstract:Osmotic Coefficient and density measurements are reported for the aqueous solutions of three hydrochloride salts of local anesthetical drug compounds, procaine (PC·HCl), lidocaine (LC·HCl), and tetracaine (TC·HCl) at 298.15 K and at ambient pressure. The experimental Osmotic Coefficient data are used to determine the activity and mean ionic activity Coefficients of solute and solvent, respectively. The activity data have been processed to obtain the mixing and excess thermodynamic properties, such as Gibbs free energy (which has been studied as a function of drug concentration), as well as to obtain the Osmotic pressure and Osmotic virial Coefficients of the drug compounds. The mean ionic activity Coefficients of the ions decrease with the increase in drug concentration. The results of mixing and excess free energy changes do not show abrupt changes. These results are examined from the point of view of premiceller (associative) equilibria and the occurrence of critical micelle concentration (cmc). A discu...
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studies of enthalpy entropy compensation partial entropies and kirkwood buff integrals for aqueous solutions of glycine l leucine and glycylglycine at 298 15 k
Journal of Physical Chemistry B, 2009Co-Authors: Deepti N Kurhe, Dilip H Dagade, Jyoti P Jadhav, Sanjay P Govindwar, Kesharsingh J PatilAbstract:Densities and Osmotic Coefficient measurements for dilute aqueous solutions of glycine, l-leucine, and glycylglycine have been reported at 298.15 K. The partial molar volumes and activity Coefficients of solute as well as solvent have been estimated using the density and Osmotic Coefficient data, respectively. Excess and mixing thermodynamic properties, such as Gibbs free energy, enthalpy, and entropy changes, have been obtained using the activity data from this study and the heat data reported in the literature. The concentration enthalpy−entropy compensation effects have been observed for the studied systems, and the compensation temperatures are reported. It has been observed that the excess free energy change for all the studied systems is almost the same over the studied concentration range, showing that the differences in properties of such solutions are largely decided by the enthalpy−entropy effects. These results, along with partial entropy data, show the effects of the presence of hydrophobic in...
Christoph Held - One of the best experts on this subject based on the ideXlab platform.
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toward thermodynamic predictions of aqueous vitamin solubility an activity Coefficient based approach
Industrial & Engineering Chemistry Research, 2019Co-Authors: Kamila Wysoczanska, Gabriele Sadowski, Eugenia A Macedo, Christoph HeldAbstract:Research on water-soluble vitamins is still required, especially due to the diversity of their structures that influence strongly physicochemical properties of water–vitamin mixtures. Such influences are still underexplored. Further, solubility of vitamins in aqueous environment is of crucial importance for life sciences and process design, but still experimental data of vitamin solubility is rather limited in literature. In this work, solubilities of the vitamins ascorbic acid, riboflavin, nicotinic acid, folic acid, and cyanocobalamin were predicted with Perturbed-Chain Statistical Associating Fluid Theory (PC-SAFT). PC-SAFT parameters for vitamins were estimated by fitting them to solubility-independent data, namely experimental liquid-density data and Osmotic-Coefficient data of aqueous vitamin solutions measured in this work. PC-SAFT predicted solubilities were validated by new experimental solubility data at T = 298.15 K and p = 1 bar. PC-SAFT predictions were in quantitative agreement to experiment...
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guanidinium cation effect on the water activity of ternary s aminopentanedioic acid sodium salt solutions at 298 15 and 310 15 k
Journal of Chemical & Engineering Data, 2019Co-Authors: Elena N Tsurko, Roland Neueder, Christoph Held, Werner KunzAbstract:Vapor pressure measurements were applied to the systems guanidinium hydrochloride (methanamidine hydrochloride) + sodium l-glutamate (S-aminopenthanedioic acid sodium salt) + water at varying concentrations of GndmCl and Na-l-Glu (m(NaGlu) = 0.1–1.6 mol/kg; m (GndmCl) = 0.104 mol/kg, 0.301 mol/kg, 0.684 mol/kg) for two temperatures, T = 298.15 and 310.15 K. From the experimental results, activities of water, activity Coefficients of water, and the corresponding Osmotic Coefficients of the mixtures Na-l-Glu + GndmCl + water have been calculated, both being directly related to the chemical potentials of the different components and therefore to their Gibbs energy. The modeling of the components’ chemical potentials in ternary GndmCl + Na-l-Glu + water solutions was done with the equation of state ePC-SAFT. Osmotic Coefficients, fugacity Coefficients, and activity Coefficients of the mixture components were modeled. Experimental Osmotic Coefficient values demonstrate nonlinear concentration dependences with ...
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Toward Thermodynamic Predictions of Aqueous Vitamin Solubility: An Activity Coefficient-Based Approach
2019Co-Authors: Kamila Wysoczanska, Gabriele Sadowski, Eugénia A. Macedo, Christoph HeldAbstract:Research on water-soluble vitamins is still required, especially due to the diversity of their structures that influence strongly physicochemical properties of water–vitamin mixtures. Such influences are still underexplored. Further, solubility of vitamins in aqueous environment is of crucial importance for life sciences and process design, but still experimental data of vitamin solubility is rather limited in literature. In this work, solubilities of the vitamins ascorbic acid, riboflavin, nicotinic acid, folic acid, and cyanocobalamin were predicted with Perturbed-Chain Statistical Associating Fluid Theory (PC-SAFT). PC-SAFT parameters for vitamins were estimated by fitting them to solubility-independent data, namely experimental liquid-density data and Osmotic-Coefficient data of aqueous vitamin solutions measured in this work. PC-SAFT predicted solubilities were validated by new experimental solubility data at T = 298.15 K and p = 1 bar. PC-SAFT predictions were in quantitative agreement to experimental vitamin solubility in water. Further, PC-SAFT allowed predicting the temperature influence on the solubility of vitamins in water with reasonable accuracy
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compatible solutes thermodynamic properties relevant for effective protection against Osmotic stress
Fluid Phase Equilibria, 2016Co-Authors: Christoph Held, Gabriele SadowskiAbstract:Abstract Organisms developed very different strategies to protect themselves against Osmotic stress. To sustain high salt concentrations of their surrounding some organisms accumulate so-called compatible solutes (CSs), which increase the internal Osmotic pressure without disturbing the organism’s metabolism. At constant temperature, Osmotic pressure is mainly determined by the concentration of the compatible solute and the Osmotic Coefficient of the aqueous solution, and to a minor extent also by solution densities. Thus, Osmotic Coefficients and densities were measured for aqueous CS solutions in a broad range of concentration and at three temperatures (273 K, 310 K, 323 K) at atmospheric pressure. Further, the solubility of CSs in water was measured as function of temperature to determine the maximum CS concentration that can be applied in aqueous solutions. CSs under investigation were trimethylamine N-oxide (TMAO), trehalose, citrulline, N,N-dimethylglycine, DMSO, glycerol, methylglycine, and ectoine. The data was used to calculate real Osmotic pressures induced by these CSs. PC-SAFT was applied to model thermodynamic properties and phase equilibria of aqueous CS solutions in quantitative agreement to experimental data. Among the CSs investigated in this work, TMAO induced the highest Osmotic pressure and thus can be considered the best protector against Osmotic stress. The data was finally analyzed concerning the influence of CSs molecular size, charge, and hydrophobicity on Osmotic pressure. This included also the comparison to incompatible solutes (urea, glycine).
Vinay A. Juvekar - One of the best experts on this subject based on the ideXlab platform.
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development of a model for electrostatic contribution to the Osmotic Coefficient of aqueous electrolytes
Industrial & Engineering Chemistry Research, 2019Co-Authors: Jyoti Sahu, Vinay A. JuvekarAbstract:This work is the extension of our previous work [Fluid Phase Equil. 2018, 460, 57; Data in Brief 2018, 19, 485]. In this work, a predictive model has been developed for the electrostatic interaction which is based on the cell model. In this model, there are three regions around the central ion. Owing to the presence of a very high electric field (approximately 1010 V·m–1) around the central ion, water molecules are highly oriented toward the central ion and have the dielectric constant less than the dielectric constant of water in the second region (partially oriented water molecules). The third region contains the water molecules with a dielectric constant as bulk water. The electrostatic interaction, computed by the cell model, is compared with the measured electrostatic interaction in our previous work, and a good match was found between them.
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Development of a rationale for decoupling Osmotic Coefficient of electrolytes into electrostatic and nonelectrostatic contributions
Fluid Phase Equilibria, 2018Co-Authors: Jyoti Sahu, Vinay A. JuvekarAbstract:Abstract In this work, a method has been developed to decouple the electrostatic and the nonelectrostatic contributions to the Osmotic Coefficient. The observation, that the Osmotic Coefficient-molality plot exhibits a linear region over a significant range of concentration, allows estimation of the primary hydration number of electrolytes and also to hypothesize that the primary hydration number does not depend on electrolyte concentration. The estimated value of the primary hydration number agrees well with that obtained using NMR spectroscopy and exhibits correct dependence on temperature. It is also shown that in a mixture of electrolytes, each electrolyte retains its own primary hydration number irrespective of the presence of the other electrolytes. The estimate of the primary hydration number allows us to determine the nonelectrostatic contribution to the Osmotic Coefficient for the single and the mixed electrolytes over the entire range of electrolyte concentration. Subtraction of this contribution from the Osmotic Coefficient yields the electrostatic contribution. The secondary hydration number, which is responsible for modulating electrostatic interaction, attains a constant value beyond the electrostatic screening limit and at a fixed temperature, this value is found to be independent of the type of electrolyte. The sum of the primary hydration number and the limiting secondary hydration number agrees well with the hydration number estimated using the extended X-ray absorption fine structure spectroscopy. The most important contribution of this work is the isolation of the electrostatic contribution to the Osmotic Coefficient of solutions of single and mixed electrolytes. The electrostatic interaction is shown to much stronger than that predicted by the extended Debye-Huckel theory, which points to a need for revision of the existing theories for electrostatics of concentrated electrolytes. The electrostatic contribution estimated using the present method, for both single as well as mixed electrolytes, would provide the basis for validation of the revised theories.
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A view on thermodynamics of concentrated electrolytes: Modification necessity for electrostatic contribution of Osmotic Coefficient
2018Co-Authors: Jyoti Sahu, Vinay A. JuvekarAbstract:Prediction of the Osmotic Coefficient of concentrated electrolytes is needed in a wide variety of industrial applications. There is a need to correctly segregate the electrostatic contribution to Osmotic Coefficient from nonelectrostatic contribution. This is achieved in a rational way in this work. Using the Robinson-Stokes-Glueckauf hydrated ion model to predict non-electrostatic contribution to the Osmotic Coefficient, it is shown that hydration number should be independent of concentration so that the observed linear dependence of Osmotic Coefficient on electrolyte concentration in high concentration range could be predicted. The hydration number of several electrolytes (LiCl, NaCl, KCl, MgCl2, and MgSO4) has been estimated by this method. The hydration number predicted by this model shows correct dependence on temperature. It is also shown that the electrostatic contribution to Osmotic Coefficient is underpredicted by the Debye-Huckel theory at concentration beyond 0.1 m. The Debye-Huckel theory is m...
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Data on primary hydration characteristics of aqueous electrolytes
'Elsevier BV', 2018Co-Authors: Jyoti Sahu, Vinay A. JuvekarAbstract:The data presented in this article support the research article entitled ''Development of a rationale for decoupling Osmotic Coefficient of electrolytes into electrostatic and nonelectrostatic contributions'' (Sahu and Juvekar, 2018) [1]. In this article, we have presented the plots of Osmotic Coefficients against molality for more than hundred aqueous single electrolytes at 25 °C. The linear regions in these plots are marked to show that they are present in all these electrolytes and that these regions extend over a wide range of concentrations. Slopes of the linear regions are used to estimate the primary molar hydration volume as well as the primary hydration number of these electrolytes. These values are also listed and the method of estimation is presented with sample calculation. These data, not only reinforce the observations made in the main article but also provide useful measures for estimation of the nonelectrostatic contribution to the Osmotic Coefficient
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effect of structure on solution and interfacial properties of sodium polystyrene sulfonate napss
Polymer International, 2007Co-Authors: Akhil Kumar Sen, Sandip Roy, Vinay A. JuvekarAbstract:Sodium polystyrene sulfonate (NaPSS) is synthesized by two different methods: one using free radical polymerization of sodium styrene sulfonate and another through post-sulfonation of polystyrene. Both the solution and interfacial properties of the two polymers obtained from these two methods are different. The Osmotic Coefficient of free radically polymerized NaPSS is 20% higher than that of the NaPSS obtained from the post-sulfonation method. Further, the free radically polymerized NaPSS has negligible interfacial activity at both air–water and toluene–water interfaces, as compared to post-sulfonated NaPSS. The former type of NaPSS also adsorbs to a comparatively lesser extent at a solid–liquid interface. The enhanced hydrophobic character of post-sulfonated NaPSS is explained on the basis of its intrinsically lower configurational entropy that results from the formation of intramolecular sulfone linkages, whereas the free radical method gives only a linear structure. Also, the intramolecular sulfone linkage will enhance the counter-ion condensation and consequently decrease the Osmotic Coefficient of the post-sulfonated sample. However, it is generally difficult to predict the exact degree of intramolecular sulfone linkage that may occur, as it depends on several factors. An attempt has been made to interpret some of the experimental data in the existing literature on NaPSS, which has mostly been prepared using the post-sulfonation route. Copyright © 2006 Society of Chemical Industry
Abderrahim Samaouali - One of the best experts on this subject based on the ideXlab platform.
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new thermodynamic data for kno3 sucrose water ternary system water activity Osmotic Coefficient activity Coefficient excess gibbs energy solubility and transfer gibbs energy at 298 15 k
Fluid Phase Equilibria, 2020Co-Authors: Abdelfetah Mounir, Brahim Messnaoui, Abderrahim Dinane, Abderrahim SamaoualiAbstract:Abstract On the basis of the measurement of relative humidity, the hygrometric method is used to determine the new thermodynamic data of water activity and Osmotic Coefficient of water-sucrose-potassium nitrate system in the wide range of KNO3 molality, varying from 0.10 to 3.00 molkg−1 and for various contents of sucrose (0.10, 0.30, 0.5, 1.00, 2.00, 4.00, and 6.00 molkg−1). The experimental results are compared with the predictions of the extended composed additivity (ECA) rule, the Lin et al. equation, and Lietzke and Stoughton (LS II) models. The Pitzer-Simonson-Clegg model is employed to correlate these data and calculate the other thermodynamic properties such as, the stoichiometric ionic mean activity Coefficient of KNO3, the excess Gibbs energy, the solubility in aqueous solution of the studied system and the transfer Gibbs energy of KNO3 from water (W) to sucrose-water (W + S) mixtures. The different interactions that occur in the ternary solution between water, sucrose and KNO3 are discussed.
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determination of water activity Osmotic Coefficient activity Coefficient solubility excess gibbs energy and transfer gibbs energy of kcl d sucrose water mixture at 298 15 k
The Journal of Chemical Thermodynamics, 2020Co-Authors: Abdelfetah Mounir, Brahim Messnaoui, Abderrahim Dinane, Abderrahim SamaoualiAbstract:Abstract In this paper, we present the results of investigations of the KCl-D–sucrose-H2O ternary system using hygrometric method based on measurement of the relative humidity at the wide range of concentration to about saturation for both KCl and D–sucrose in different molalities of D–sucrose of (0.20, 0.50, 1.00, 2.00, 3.00, 4.00, 5.00 and 6.00) mol.kg−1 with the molality of KCl ranged from (0.20 to 4.50) mol.kg−1 at 298.15 K. The measured data are used to determine the water activities and Osmotic Coefficients. These studies are complemented using Pitzer-Simonson-Clegg model to understand different interactions involved between carbohydrates and KCl. Therefore, the water was considered as reference state in this study. Thus four mixture parameters are determined and used to predict the mean activity Coefficients of KCl and D–sucrose. The solubility, excess Gibbs energy and transfer Gibbs energy are also calculated for this system.
