[article] 
inIndustrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6375-6381

Titre :	Effects of cooling rate, saturation temperature, and solvent on the metastable zone width of triethanolamine hydrochloride
Type de document :	texte imprimé
Auteurs :	Yan Zhang, Auteur ; Zhibao Li, Auteur
Année de publication :	2011
Article en page(s) :	pp. 6375-6381
Note générale :	Chimie industrielle
Langues :	Anglais (eng)
Mots-clés :	Saturation Cooling
Résumé :	The metastable zone widths (MZWs) of triethanolamine hydrochloride ([HTEA]Cl), defined as the maximum temperature difference ΔTmax a solution can withstand before crystallization of a solid phase, in water, ethanol-water, and HCl-water mixed solvents have been determined at a saturation temperature To range from 293.15 to 303.15 K with cooling rate R from 3 to 8 K·h-1. Solubilities of [HTEA]Cl in ethanol-water mixtures have also been obtained using a dynamic method. An equation of MZW with similar form to Sangwal's equation was derived from the fundamental driving force of crystallization based on chemical potential. With the newly obtained equation, the experimental values of MZW ΔTmax for [HTEA]Cl-water system at 298.15 K was correlated with the cooling rate R by ln(ΔTmax/T0) = -6.140 + 1.222 In R. The enthalpy of mixing ΔHmix was calculated with the solubility data, and the result of differential scanning calorimetry (DSC). For [HTEA]Cl-water system, the value of ΔHmix was determined to be 30.88 kJ·mol-1, and the addition of both HCl and ethanol led to a decrease of -ΔHmix. The experimental results also showed that MZW could be greatly enhanced when ethanol and HCl were added. It was found that the values ofMZW decrease with -ΔHmix for both [HTEA]Cl-ethanol-water and [HTEA]Cl-HCl-water systems at the same saturation temperature and cooling rate.
DEWEY :	660
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=24158934

[article] Effects of cooling rate, saturation temperature, and solvent on the metastable zone width of triethanolamine hydrochloride [texte imprimé] / Yan Zhang, Auteur ; Zhibao Li, Auteur . - 2011 . - pp. 6375-6381.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 50 N° 10 (Mai 2011) . - pp. 6375-6381

Mots-clés :	Saturation Cooling
Résumé :	The metastable zone widths (MZWs) of triethanolamine hydrochloride ([HTEA]Cl), defined as the maximum temperature difference ΔTmax a solution can withstand before crystallization of a solid phase, in water, ethanol-water, and HCl-water mixed solvents have been determined at a saturation temperature To range from 293.15 to 303.15 K with cooling rate R from 3 to 8 K·h-1. Solubilities of [HTEA]Cl in ethanol-water mixtures have also been obtained using a dynamic method. An equation of MZW with similar form to Sangwal's equation was derived from the fundamental driving force of crystallization based on chemical potential. With the newly obtained equation, the experimental values of MZW ΔTmax for [HTEA]Cl-water system at 298.15 K was correlated with the cooling rate R by ln(ΔTmax/T0) = -6.140 + 1.222 In R. The enthalpy of mixing ΔHmix was calculated with the solubility data, and the result of differential scanning calorimetry (DSC). For [HTEA]Cl-water system, the value of ΔHmix was determined to be 30.88 kJ·mol-1, and the addition of both HCl and ethanol led to a decrease of -ΔHmix. The experimental results also showed that MZW could be greatly enhanced when ethanol and HCl were added. It was found that the values ofMZW decrease with -ΔHmix for both [HTEA]Cl-ethanol-water and [HTEA]Cl-HCl-water systems at the same saturation temperature and cooling rate.
DEWEY :	660
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=24158934