Documents disponibles écrits par cet auteur

Determination and correlation of solubility of decahydropyrazino [2,3 - b] pyrazine in methanol, ethanol, and 2 - propanol / Jing Chen in Industrial & engineering chemistry research, Vol. 50 N° 20 (Octobre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11755-11762 Titre : Determination and correlation of solubility of decahydropyrazino [2,3 - b] pyrazine in methanol, ethanol, and 2 - propanol Type de document : texte imprimé Auteurs : Jing Chen, Auteur ; Zuo-Xiang Zeng, Auteur ; Wei-Lan Xue, Auteur Année de publication : 2011 Article en page(s) : pp. 11755-11762 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Solubility  Correlation  analysis  Correlation Résumé : The solubilities of decahydropyrazino[2,3-b]pyrazine (DHPP) in methanol, ethanol, and 2-propanol were measured at temperatures ranging from 274.95 to 354.75 K. The last crystal disappearance method was used to determine the solubility of DHPP. The experimental data were correlated by the van't Hoff plot, λh (Buchowski) equation, modified Apelblat equation, and two local composition models (Wilson and NRTL). Moreover, the densities of (DHPP + water) solution were measured from 274.25 to 355.95 K, and the liquid molar volume of DHPP, Vml (T), was obtained and used to calculate the parameters in the Wilson model. It was found that NRTL model gave the best correlation results. On the basis of the NRTL model and experimental data, the thermodynamic excess functions (ΔGE, ΔSE, and ΔHE) of DHPP + alcohols (methanol, ethanol, and 2-propanol) systems were determined. Furthermore, the infinite-dilution activity coefficient and the infinite-dilution reduced excess enthalpy (γ∞1 and ΔH∞E1) were derived. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24612403 [article] Determination and correlation of solubility of decahydropyrazino [2,3 - b] pyrazine in methanol, ethanol, and 2 - propanol [texte imprimé] / Jing Chen, Auteur ; Zuo-Xiang Zeng, Auteur ; Wei-Lan Xue, Auteur . - 2011 . - pp. 11755-11762. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 20 (Octobre 2011) . - pp. 11755-11762 Mots-clés : Solubility  Correlation  analysis  Correlation Résumé : The solubilities of decahydropyrazino[2,3-b]pyrazine (DHPP) in methanol, ethanol, and 2-propanol were measured at temperatures ranging from 274.95 to 354.75 K. The last crystal disappearance method was used to determine the solubility of DHPP. The experimental data were correlated by the van't Hoff plot, λh (Buchowski) equation, modified Apelblat equation, and two local composition models (Wilson and NRTL). Moreover, the densities of (DHPP + water) solution were measured from 274.25 to 355.95 K, and the liquid molar volume of DHPP, Vml (T), was obtained and used to calculate the parameters in the Wilson model. It was found that NRTL model gave the best correlation results. On the basis of the NRTL model and experimental data, the thermodynamic excess functions (ΔGE, ΔSE, and ΔHE) of DHPP + alcohols (methanol, ethanol, and 2-propanol) systems were determined. Furthermore, the infinite-dilution activity coefficient and the infinite-dilution reduced excess enthalpy (γ∞1 and ΔH∞E1) were derived. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24612403

Heat capacity, enthalpy of formation, and entropy of methyl carbamate / Zuo-Xiang Zeng in Industrial & engineering chemistry research, Vol. 49 N° 12 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5543–5548 Titre : Heat capacity, enthalpy of formation, and entropy of methyl carbamate Type de document : texte imprimé Auteurs : Zuo-Xiang Zeng, Auteur ; Xiao-Nan Li, Auteur ; Wei-Lan Xue, Auteur Année de publication : 2010 Article en page(s) : pp. 5543–5548 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Methyl  carbamate  Heat  capacity Résumé : The heat capacity (Cp) of methyl carbamate (MC) was measured with an adiabatic calorimeter. The standard enthalpy of formation (ΔfH0(cr, 298.15 K)) and the standard entropy (S0(cr, 298.15 K)) for MC were determined. Thus, Cp(T) values of MC were obtained for the crystal and liquid forms in the temperature range of 298.15−433.10 K. A quadratic trinomial was used to correlate the data of Cp(T). The enthalpy of fusion of MC was measured using differential scanning calorimetry (DSC), and its sublimation enthalpy was estimated. The gas-phase standard enthalpy of formation (ΔfH0(g, 298.15 K)) of MC was calculated via the method of group contribution developed by Benson. Based on the above data, the values of ΔfH0(cr, 298.15 K) and S0(cr, 298.15 K) of MC were estimated to be −513.57 kJ/mol and 77.1 J mol−1 K−1, respectively. A thermochemical cycle including a reversible reaction was designed to examine the reliability of the estimated values by measuring the equilibrium constant of the reaction. The results showed that the estimated values for MC were acceptable. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014342 [article] Heat capacity, enthalpy of formation, and entropy of methyl carbamate [texte imprimé] / Zuo-Xiang Zeng, Auteur ; Xiao-Nan Li, Auteur ; Wei-Lan Xue, Auteur . - 2010 . - pp. 5543–5548. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5543–5548 Mots-clés : Methyl  carbamate  Heat  capacity Résumé : The heat capacity (Cp) of methyl carbamate (MC) was measured with an adiabatic calorimeter. The standard enthalpy of formation (ΔfH0(cr, 298.15 K)) and the standard entropy (S0(cr, 298.15 K)) for MC were determined. Thus, Cp(T) values of MC were obtained for the crystal and liquid forms in the temperature range of 298.15−433.10 K. A quadratic trinomial was used to correlate the data of Cp(T). The enthalpy of fusion of MC was measured using differential scanning calorimetry (DSC), and its sublimation enthalpy was estimated. The gas-phase standard enthalpy of formation (ΔfH0(g, 298.15 K)) of MC was calculated via the method of group contribution developed by Benson. Based on the above data, the values of ΔfH0(cr, 298.15 K) and S0(cr, 298.15 K) of MC were estimated to be −513.57 kJ/mol and 77.1 J mol−1 K−1, respectively. A thermochemical cycle including a reversible reaction was designed to examine the reliability of the estimated values by measuring the equilibrium constant of the reaction. The results showed that the estimated values for MC were acceptable. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014342

Kinetics of cyanuric chloride hydrolysis in aqueous solution / Zhi Yan in Industrial & engineering chemistry research, Vol. 47 n°15 (Août 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5318–5322 Titre : Kinetics of cyanuric chloride hydrolysis in aqueous solution Type de document : texte imprimé Auteurs : Zhi Yan, Auteur ; Wei-Lan Xue, Auteur ; Zuo-Xiang Zeng, Auteur Année de publication : 2008 Article en page(s) : p. 5318–5322 Note générale : Bibliogr. p. 5321-5322 Langues : Anglais (eng) Mots-clés : Cyanuric  chloride;  Hydrolysis  reaction;  Aqueous  solution Résumé : The hydrolysis of cyanuric chloride is investigated as a function of temperature, pH, and cyanuric chloride concentration in liquid phase. The hydrolysis reaction is carried out in water or acetone/water system in the temperature range of 283.15−303.15 K. The hydrolysis rates of cyanuric chloride are monitored at different temperatures and at various pHs. The experiment data show that the hydrolysis rates are independent of pH value when pH ≤ 6, and increase with the pH value when pH ≥ 7. On the basis of the results, it is supposed that the hydrolysis reaction takes place by the unimolecular nucleophilic substitution (SN1) mechanism when pH ≤ 6 and by the bimolecular nucleophilic substitution (SN2) mechanism when pH ≥ 7. Kinetics models corresponding to the mechanisms are proposed as follow: −d(nA/v)/dt = 7.625 × 109e−69298/RTcA for the acidic situation and −d(nA/v)/dt = 7.112 × 1011e−59267/RTcAcB0.5 for the alkaline situation. Experiment data show that the models work well with the average deviations of 2.01% and 9.88%, respectively. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071289x [article] Kinetics of cyanuric chloride hydrolysis in aqueous solution [texte imprimé] / Zhi Yan, Auteur ; Wei-Lan Xue, Auteur ; Zuo-Xiang Zeng, Auteur . - 2008 . - p. 5318–5322. Bibliogr. p. 5321-5322 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5318–5322 Mots-clés : Cyanuric  chloride;  Hydrolysis  reaction;  Aqueous  solution Résumé : The hydrolysis of cyanuric chloride is investigated as a function of temperature, pH, and cyanuric chloride concentration in liquid phase. The hydrolysis reaction is carried out in water or acetone/water system in the temperature range of 283.15−303.15 K. The hydrolysis rates of cyanuric chloride are monitored at different temperatures and at various pHs. The experiment data show that the hydrolysis rates are independent of pH value when pH ≤ 6, and increase with the pH value when pH ≥ 7. On the basis of the results, it is supposed that the hydrolysis reaction takes place by the unimolecular nucleophilic substitution (SN1) mechanism when pH ≤ 6 and by the bimolecular nucleophilic substitution (SN2) mechanism when pH ≥ 7. Kinetics models corresponding to the mechanisms are proposed as follow: −d(nA/v)/dt = 7.625 × 109e−69298/RTcA for the acidic situation and −d(nA/v)/dt = 7.112 × 1011e−59267/RTcAcB0.5 for the alkaline situation. Experiment data show that the models work well with the average deviations of 2.01% and 9.88%, respectively. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071289x

Measurement and correlation of the solubility of ammonia in ethanol between 277.35 and 318.25 K / Zuo-Xiang Zeng in Industrial & engineering chemistry research, Vol. 50 N° 6 (Mars 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3592–3597 Titre : Measurement and correlation of the solubility of ammonia in ethanol between 277.35 and 318.25 K Type de document : texte imprimé Auteurs : Zuo-Xiang Zeng, Auteur ; Jing Chen, Auteur ; Wei-Lan Xue, Auteur Année de publication : 2011 Article en page(s) : pp. 3592–3597 Langues : Anglais (eng) Mots-clés : Solubility  ammonia  Ethanol Résumé : The solubility of ammonia in ethanol was measured by a static−analytic method. The total pressure is up to about 0.4 MPa, and temperature ranges from (277.35 to 318.25) K. The relationship between the partial molar volume of ammonia infinitely diluted in ethanol and temperature is obtained by measuring the density of (ethanol + ammonia) solution. The experimental results are used to determine the (molality scale based) Henry’s constant of ammonia in ethanol, where the activity in the liquid phase is calculated by applying the molality scale based Gibbs excess energy model of Pitzer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102089x [article] Measurement and correlation of the solubility of ammonia in ethanol between 277.35 and 318.25 K [texte imprimé] / Zuo-Xiang Zeng, Auteur ; Jing Chen, Auteur ; Wei-Lan Xue, Auteur . - 2011 . - pp. 3592–3597. Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 6 (Mars 2011) . - pp. 3592–3597 Mots-clés : Solubility  ammonia  Ethanol Résumé : The solubility of ammonia in ethanol was measured by a static−analytic method. The total pressure is up to about 0.4 MPa, and temperature ranges from (277.35 to 318.25) K. The relationship between the partial molar volume of ammonia infinitely diluted in ethanol and temperature is obtained by measuring the density of (ethanol + ammonia) solution. The experimental results are used to determine the (molality scale based) Henry’s constant of ammonia in ethanol, where the activity in the liquid phase is calculated by applying the molality scale based Gibbs excess energy model of Pitzer. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102089x