Measuring the amount of crystallinity in solutions using DSC

The amount of solid that forms in a solution at temperatures below the cloud point, is an important quantity in the design of crystallisation processes. A new method using differential scanning calorimetry (DSC) to measure the fraction of crystallised solution, α solutionS ' is proposed. A very...

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Veröffentlicht in:Canadian journal of chemical engineering 1997-12, Vol.75 (6), p.1075-1079
Hauptverfasser: Coutinho, João A. P., Calange, Sandra, Ruffier-Meray, Veronique
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container_issue 6
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container_title Canadian journal of chemical engineering
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creator Coutinho, João A. P.
Calange, Sandra
Ruffier-Meray, Veronique
description The amount of solid that forms in a solution at temperatures below the cloud point, is an important quantity in the design of crystallisation processes. A new method using differential scanning calorimetry (DSC) to measure the fraction of crystallised solution, α solutionS ' is proposed. A very good agreement is obtained between the data measured by the new calorimetric method and using alternative techniques. A simple graphic version of the calculation procedure is also presented. It is shown to produce quick and fair estimates for the solid fraction by a simple analysis of a plot of enthalpy variation with temperature. La quantité de solides qui se forme dans une solution à des températures au‐dessous du point de trouble est un facteur important dans la conception des procédes de cristallisation. On propose une nouvelle méthode utilisant la calorimétrie différentielle à balayage (DSC) afin de mesurer la fraction de solution cristallisée, α solutionS' Un très bon accord est obtenu entre les données mesurées par la nouvelle méthode calorimétrique et d'autres techniques utilisées. On version graphique simple de la procédure de calcul est également présentée. On montre qu'elle peut produire des estimations rapides et fiabies pour la fraction de solides par simple analyse d'un tracé de variation d'enthaipie avec la température.
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On propose une nouvelle méthode utilisant la calorimétrie différentielle à balayage (DSC) afin de mesurer la fraction de solution cristallisée, α solutionS' Un très bon accord est obtenu entre les données mesurées par la nouvelle méthode calorimétrique et d'autres techniques utilisées. On version graphique simple de la procédure de calcul est également présentée. 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La quantité de solides qui se forme dans une solution à des températures au‐dessous du point de trouble est un facteur important dans la conception des procédes de cristallisation. On propose une nouvelle méthode utilisant la calorimétrie différentielle à balayage (DSC) afin de mesurer la fraction de solution cristallisée, α solutionS' Un très bon accord est obtenu entre les données mesurées par la nouvelle méthode calorimétrique et d'autres techniques utilisées. On version graphique simple de la procédure de calcul est également présentée. 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source Wiley Online Library Journals Frontfile Complete
subjects Applied sciences
calorimetry
Chemical engineering
Chemistry
crystallisation
Crystallization, leaching, miscellaneous separations
DSC
Exact sciences and technology
General and physical chemistry
Liquid-solid equilibria
Phase equilibria
solid-liquid equilibrium
title Measuring the amount of crystallinity in solutions using DSC
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