Thermodynamic preparation window of alpha calcium sulfate hemihydrate from calcium sulfate dihydrate in non - electrolyte glycerol – water solution under mild conditions / Baohong Guan in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13561-1356 Titre : Thermodynamic preparation window of alpha calcium sulfate hemihydrate from calcium sulfate dihydrate in non - electrolyte glycerol – water solution under mild conditions Type de document : texte imprimé Auteurs : Baohong Guan, Auteur ; Guangming Jiang, Auteur ; Hailu Fu, Auteur Année de publication : 2012 Article en page(s) : pp. 13561-1356 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Electrolyte Preparation Résumé : Through vapor pressure measurements, water activities of the glycerol-water solution were first examined under temperatures of 30―85 °C and glycerol concentrations of 0―50 mol %. The water activity is the only determinant of phase-transition point among CaSO4·2H2O (DH), α-CaSO4·0.5H2O (α-HH), and CaSO4 (AH) in glycerol-water solution. Accordingly, a phase-transition diagram was constructed as a function of temperature (0―140 °C) and glycerol concentration (0―50 mol %), which provided a thermodynamic preparation window of α-HH from DH. Controlling glycerol concentration and temperature within the window, direct transition of DH to α-HH can be regnlated. However, the window is apt to shrink as the operating time is shortened, indicating that its available profile is directed by transition kinetics ofDH to α-HH besides transition thermodynamics. Overall, the glycerol―water solution could act as a novel category of nonelectrolyte medium for α-HH preparation from DH. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267515 [article] Thermodynamic preparation window of alpha calcium sulfate hemihydrate from calcium sulfate dihydrate in non - electrolyte glycerol – water solution under mild conditions [texte imprimé] / Baohong Guan, Auteur ; Guangming Jiang, Auteur ; Hailu Fu, Auteur . - 2012 . - pp. 13561-1356. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13561-1356 Mots-clés : Electrolyte Preparation Résumé : Through vapor pressure measurements, water activities of the glycerol-water solution were first examined under temperatures of 30―85 °C and glycerol concentrations of 0―50 mol %. The water activity is the only determinant of phase-transition point among CaSO4·2H2O (DH), α-CaSO4·0.5H2O (α-HH), and CaSO4 (AH) in glycerol-water solution. Accordingly, a phase-transition diagram was constructed as a function of temperature (0―140 °C) and glycerol concentration (0―50 mol %), which provided a thermodynamic preparation window of α-HH from DH. Controlling glycerol concentration and temperature within the window, direct transition of DH to α-HH can be regnlated. However, the window is apt to shrink as the operating time is shortened, indicating that its available profile is directed by transition kinetics ofDH to α-HH besides transition thermodynamics. Overall, the glycerol―water solution could act as a novel category of nonelectrolyte medium for α-HH preparation from DH. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267515

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