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Experimental studies and thermodynamic modeling of the solubilities of potassium nitrate, potassium chloride, potassium bromide, and sodium chloride in dimethyl sulfoxide / Bingwen Long in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 7019-7026 Titre : Experimental studies and thermodynamic modeling of the solubilities of potassium nitrate, potassium chloride, potassium bromide, and sodium chloride in dimethyl sulfoxide Type de document : texte imprimé Auteurs : Bingwen Long, Auteur Année de publication : 2011 Article en page(s) : pp. 7019-7026 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Solubility  Modeling Résumé : Using appropriate nonaqueous solvents to replace water as reaction medium in chemical industries has gained more and more attention recently. Many of them have the special ability to dissolve some compounds and thus may make the reaction more stable in comparison with a water-containing environment Dimethyl sulfoxide (DMSO) is probably the most frequently mentioned aprotic nonaqueous solvent with extensive applications because of its high stability and powerful solubility. In this study, the solubilities of four inorganic salts, namely potassium nitrate (KNO3), potassium chloride (KCl), potassium bromide (KBr) and sodium chloride (NaCl), in DMSO are measured in the temperature range of 302 through 354 K using a dynamic method. The solubility order of the salts in DMSO is experimentally determined as KNO3 > KBr > NaCl > KCl. The molality solubilities show linear dependencies on temperature and the temperature effect on the solubility for the salts follows the same order as the solubility result. The solubility products of the salts in DMSO at different temperatures are obtained by estimating the solubility products in water and the Gibbs energy of transfer from water to DMSO. Then electrolyte models of the Wilson, NRTL, and UNIQUAC equations are used to model the solubility of the inorganic salts in DMSO. It is found that the three-parameter E-Wilson equation gives the best correlation results followed by the Pitzer, E-NRTL, and E-UNIQUAC equations, while the two-parameter E-Wilson equation presents the worst results in terms of the overall standard deviation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199920 [article] Experimental studies and thermodynamic modeling of the solubilities of potassium nitrate, potassium chloride, potassium bromide, and sodium chloride in dimethyl sulfoxide [texte imprimé] / Bingwen Long, Auteur . - 2011 . - pp. 7019-7026. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 7019-7026 Mots-clés : Solubility  Modeling Résumé : Using appropriate nonaqueous solvents to replace water as reaction medium in chemical industries has gained more and more attention recently. Many of them have the special ability to dissolve some compounds and thus may make the reaction more stable in comparison with a water-containing environment Dimethyl sulfoxide (DMSO) is probably the most frequently mentioned aprotic nonaqueous solvent with extensive applications because of its high stability and powerful solubility. In this study, the solubilities of four inorganic salts, namely potassium nitrate (KNO3), potassium chloride (KCl), potassium bromide (KBr) and sodium chloride (NaCl), in DMSO are measured in the temperature range of 302 through 354 K using a dynamic method. The solubility order of the salts in DMSO is experimentally determined as KNO3 > KBr > NaCl > KCl. The molality solubilities show linear dependencies on temperature and the temperature effect on the solubility for the salts follows the same order as the solubility result. The solubility products of the salts in DMSO at different temperatures are obtained by estimating the solubility products in water and the Gibbs energy of transfer from water to DMSO. Then electrolyte models of the Wilson, NRTL, and UNIQUAC equations are used to model the solubility of the inorganic salts in DMSO. It is found that the three-parameter E-Wilson equation gives the best correlation results followed by the Pitzer, E-NRTL, and E-UNIQUAC equations, while the two-parameter E-Wilson equation presents the worst results in terms of the overall standard deviation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199920

Temperature dependent solubility of α-form L-glutamic acid in selected organic solvents / Bingwen Long in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8354-8360 Titre : Temperature dependent solubility of α-form L-glutamic acid in selected organic solvents : measurements and thermodynamic modeling Type de document : texte imprimé Auteurs : Bingwen Long, Auteur ; Jing Li, Auteur ; Yuhong Song, Auteur Année de publication : 2011 Article en page(s) : pp. 8354-8360 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Modeling  Organic  solvent  Solubility Résumé : In this study the solubility of α-form L-glutamic acid in the six organic solvents methanol, ethanol, 1-propanol, acetone, formic acid, and dimethyl sulfoxide (DMSO) was measured by a static analytic method. The measurements were carried out over the temperature range 278-355 K at around 5 K intervals, and the equilibrium concentration was determined by the gravimetric method. The experimental results show that formic acid has the highest solubility to α-form L-glutamic acid while the other solvents have the solubility order water, acetone, 1-propanol, ethanol, methanol, DMSO, and acetic acid. The hypothetical enthalpy of fusion and melting temperature of L-glutamic acid are estimated. Several commonly used thermodynamic models, including the empirical van't Hoff equation and the Wilson, NRTL, and UNIQUAC equations, were applied to correlate the experimental solubility data. The binary interaction parameters of the above models are found to have a linear dependency on temperature, and the coefficients were regressed. It was found that all these models can satisfactorily reproduce the experimental solubility and the UNIQUAC equation can provide the best correlation results with an overall standard deviation of 2.7 x 10-5. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332162 [article] Temperature dependent solubility of α-form L-glutamic acid in selected organic solvents : measurements and thermodynamic modeling [texte imprimé] / Bingwen Long, Auteur ; Jing Li, Auteur ; Yuhong Song, Auteur . - 2011 . - pp. 8354-8360. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 8354-8360 Mots-clés : Modeling  Organic  solvent  Solubility Résumé : In this study the solubility of α-form L-glutamic acid in the six organic solvents methanol, ethanol, 1-propanol, acetone, formic acid, and dimethyl sulfoxide (DMSO) was measured by a static analytic method. The measurements were carried out over the temperature range 278-355 K at around 5 K intervals, and the equilibrium concentration was determined by the gravimetric method. The experimental results show that formic acid has the highest solubility to α-form L-glutamic acid while the other solvents have the solubility order water, acetone, 1-propanol, ethanol, methanol, DMSO, and acetic acid. The hypothetical enthalpy of fusion and melting temperature of L-glutamic acid are estimated. Several commonly used thermodynamic models, including the empirical van't Hoff equation and the Wilson, NRTL, and UNIQUAC equations, were applied to correlate the experimental solubility data. The binary interaction parameters of the above models are found to have a linear dependency on temperature, and the coefficients were regressed. It was found that all these models can satisfactorily reproduce the experimental solubility and the UNIQUAC equation can provide the best correlation results with an overall standard deviation of 2.7 x 10-5. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332162

Thermodynamics of partitioning system with dimerization taking place in both phases / Bingwen Long in Industrial & engineering chemistry research, Vol. 50 N° 8 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4752–4760 Titre : Thermodynamics of partitioning system with dimerization taking place in both phases Type de document : texte imprimé Auteurs : Bingwen Long, Auteur ; Yiheng Luo, Auteur Année de publication : 2011 Article en page(s) : pp. 4752–4760 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Thermodynamics Résumé : The partition coefficients of benzoic acid in partially miscible two phase mixtures of (methanol + cyclohexane) were measured at the temperature of 293.15, 303.15, and 313.15 K. The experimental results show that the benzoic acid is more soluble in methanol than in cyclohexane and thus it makes the partition coefficients, defined as the ratio of the total molar concentration of benzoic acid in methanol phase to cyclohexane phase, be greater than unity. In addition, the partition coefficient at each temperature is not a constant but increases with the increase of benzoic acid concentration in each phase even at very low concentration. This seeming deviation to the Nernst law can be explained by chemical theory of strong dimerization reactions taking place in both phases. Accordingly, a new generalized equilibrium model was proposed to describe the partition system with solute self-dimerization in both phases. The new model predictions agree well with the experimental data and the equilibrium constants for all the proposed association and partition reactions are obtained simultaneously by fitting the experimental data with nonlinear least-squares method. The results show that there is much stronger dimerization reaction for benzoic acid in methanol phase than in cycolhexane phase, which results in that the dimerization in cycolhexane phases can be totally neglected. In the methanol phase alone, the calculation results further show that dimerization of benzoic acid is so strong that almost all the solute molecules form dimers within the concentration investigated. The standard thermodynamics functions of Gibbs energy, enthalpy and entropy changes for the proposed reactions were estimated with the obtained parameters at different temperature. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1022964 [article] Thermodynamics of partitioning system with dimerization taking place in both phases [texte imprimé] / Bingwen Long, Auteur ; Yiheng Luo, Auteur . - 2011 . - pp. 4752–4760. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4752–4760 Mots-clés : Thermodynamics Résumé : The partition coefficients of benzoic acid in partially miscible two phase mixtures of (methanol + cyclohexane) were measured at the temperature of 293.15, 303.15, and 313.15 K. The experimental results show that the benzoic acid is more soluble in methanol than in cyclohexane and thus it makes the partition coefficients, defined as the ratio of the total molar concentration of benzoic acid in methanol phase to cyclohexane phase, be greater than unity. In addition, the partition coefficient at each temperature is not a constant but increases with the increase of benzoic acid concentration in each phase even at very low concentration. This seeming deviation to the Nernst law can be explained by chemical theory of strong dimerization reactions taking place in both phases. Accordingly, a new generalized equilibrium model was proposed to describe the partition system with solute self-dimerization in both phases. The new model predictions agree well with the experimental data and the equilibrium constants for all the proposed association and partition reactions are obtained simultaneously by fitting the experimental data with nonlinear least-squares method. The results show that there is much stronger dimerization reaction for benzoic acid in methanol phase than in cycolhexane phase, which results in that the dimerization in cycolhexane phases can be totally neglected. In the methanol phase alone, the calculation results further show that dimerization of benzoic acid is so strong that almost all the solute molecules form dimers within the concentration investigated. The standard thermodynamics functions of Gibbs energy, enthalpy and entropy changes for the proposed reactions were estimated with the obtained parameters at different temperature. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1022964

Thermodynamics studies on the solubility of inorganic salt in organic solvents / Bingwen Long in Industrial & engineering chemistry research, Vol. 51 N° 28 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9456-9467 Titre : Thermodynamics studies on the solubility of inorganic salt in organic solvents : Application to KI in organic solvents and water – ethanol mixtures Type de document : texte imprimé Auteurs : Bingwen Long, Auteur ; Dong Zhao, Auteur ; Wei Liu, Auteur Année de publication : 2012 Article en page(s) : pp. 9456-9467 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Organic  solvent  Solubility Résumé : A thermodynamic framework is established to calculate the solubility of inorganic salts in nonaqueous solvents. New solubility data of potassium iodide in selected organic solvents of acetone, ethanol, and 1-propanol are determined in the temperature range of 278-343 K. The experimental solubility is modeled by the methodology proposed in this work, and the solubility products of potassium iodide in organic solvents are estimated. Following this, the experimental mean activity coefficients are modeled with the electrolyte activity coefficient models of Pitzer, e-NRTL, e-Wilson equations, and their modified forms. Model parameters are optimized by fitting the experiment data. It turns out that the three-parameter e-Wilson equation presents the best correlation results with an overall average percentage relative deviation ARD of 1.36%. When the models are extrapolated to predict the low temperature solubility of potassium iodide in acetone down to 215 K, the three-parameter e-NRTL gives the most reliable predictions. A novel simple predictive mixing rule for the e-Wilson equation is proposed to estimate the solubility of potassium iodide in binary mixed solvents. The predictions are in good agreement with the experimental data of potassium iodide in water and ethanol over wide ranges of concentration and temperature. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163281 [article] Thermodynamics studies on the solubility of inorganic salt in organic solvents : Application to KI in organic solvents and water – ethanol mixtures [texte imprimé] / Bingwen Long, Auteur ; Dong Zhao, Auteur ; Wei Liu, Auteur . - 2012 . - pp. 9456-9467. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9456-9467 Mots-clés : Organic  solvent  Solubility Résumé : A thermodynamic framework is established to calculate the solubility of inorganic salts in nonaqueous solvents. New solubility data of potassium iodide in selected organic solvents of acetone, ethanol, and 1-propanol are determined in the temperature range of 278-343 K. The experimental solubility is modeled by the methodology proposed in this work, and the solubility products of potassium iodide in organic solvents are estimated. Following this, the experimental mean activity coefficients are modeled with the electrolyte activity coefficient models of Pitzer, e-NRTL, e-Wilson equations, and their modified forms. Model parameters are optimized by fitting the experiment data. It turns out that the three-parameter e-Wilson equation presents the best correlation results with an overall average percentage relative deviation ARD of 1.36%. When the models are extrapolated to predict the low temperature solubility of potassium iodide in acetone down to 215 K, the three-parameter e-NRTL gives the most reliable predictions. A novel simple predictive mixing rule for the e-Wilson equation is proposed to estimate the solubility of potassium iodide in binary mixed solvents. The predictions are in good agreement with the experimental data of potassium iodide in water and ethanol over wide ranges of concentration and temperature. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163281