Determination and chemical modeling of phase equilibria for the glycine – KCl – NaCl – H2O system and its application to produce crystals with anticaking characteristics / Wencheng Gao in Industrial & engineering chemistry research, Vol. 51 N° 24 (Juin 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 24 (Juin 2012) . - pp. 8315–8325 Titre : Determination and chemical modeling of phase equilibria for the glycine – KCl – NaCl – H2O system and its application to produce crystals with anticaking characteristics Type de document : texte imprimé Auteurs : Wencheng Gao, Auteur ; Zhibao Li, Auteur Année de publication : 2012 Article en page(s) : pp. 8315–8325 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Phase equilibria Crystals Résumé : The phase equilibria of the glycine–KCl–NaCl–H2O system were determined in the concentrations up to 3.33 mol·kg–1 over the temperature range from 283.2 to 363.2 K using a dynamic method. A rigorous chemical model for the glycine–KCl–NaCl–H2O system was established by the Pitzer model with the help of an OLI platform. With the equilibrium constants of dissociation reactions obtained by standard-state thermodynamic data, the new Pitzer model parameters were harvested by regressing solubility of the system. These newly obtained parameters were used to accurately predict the multiple saturated points at the temperature range from 283.2 to 363.2 K. The phase behavior of the ternary glycine–KCl–H2O and glycine–NaCl–H2O system at 298.2 and 343.2 K were successfully visualized with lucidity on an equilateral triangle. To investigate the effect of glycine on the morphology of KCl, the KCl crystals were produced from glycine solution with different concentration (17–25% w/v) by evaporation at ambient temperature. The glycine (25% w/v)-modified KCl crystal changed its morphology from native cubic to hexagonal prism form with the angle of repose from 32° to 23.8–25.8°, indicating a good flowability and anticaking characteristics. Finally, KCl supersaturation variation with evaporation time was simulated with aid of the chemical model established in present study to elucidate the influence of glycine concentration on the anticaking characteristics of KCl crystal. All the results generated from this study will provide the fundamentals for industrial application to produce crystals with anticaking characteristics. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300787k [article] Determination and chemical modeling of phase equilibria for the glycine – KCl – NaCl – H2O system and its application to produce crystals with anticaking characteristics [texte imprimé] / Wencheng Gao, Auteur ; Zhibao Li, Auteur . - 2012 . - pp. 8315–8325. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 24 (Juin 2012) . - pp. 8315–8325 Mots-clés : Phase equilibria Crystals Résumé : The phase equilibria of the glycine–KCl–NaCl–H2O system were determined in the concentrations up to 3.33 mol·kg–1 over the temperature range from 283.2 to 363.2 K using a dynamic method. A rigorous chemical model for the glycine–KCl–NaCl–H2O system was established by the Pitzer model with the help of an OLI platform. With the equilibrium constants of dissociation reactions obtained by standard-state thermodynamic data, the new Pitzer model parameters were harvested by regressing solubility of the system. These newly obtained parameters were used to accurately predict the multiple saturated points at the temperature range from 283.2 to 363.2 K. The phase behavior of the ternary glycine–KCl–H2O and glycine–NaCl–H2O system at 298.2 and 343.2 K were successfully visualized with lucidity on an equilateral triangle. To investigate the effect of glycine on the morphology of KCl, the KCl crystals were produced from glycine solution with different concentration (17–25% w/v) by evaporation at ambient temperature. The glycine (25% w/v)-modified KCl crystal changed its morphology from native cubic to hexagonal prism form with the angle of repose from 32° to 23.8–25.8°, indicating a good flowability and anticaking characteristics. Finally, KCl supersaturation variation with evaporation time was simulated with aid of the chemical model established in present study to elucidate the influence of glycine concentration on the anticaking characteristics of KCl crystal. All the results generated from this study will provide the fundamentals for industrial application to produce crystals with anticaking characteristics. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie300787k

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