Equilibrium study between condensed phases by isoplethic thermal analysis when a miscibility gap is observed

Isoplethic thermal analysis was used to determine the solid-liquid-liquid equilibria in the ternary system water-sodium sulfate-piperidine. The changes in state observed on the thermogram recorded during the displacement in a quasi-binary section permit the identification of the different phases and...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2009, Vol.95 (1), p.135-139
Main Authors: Labarthe, E., Bougrine, A. J., Delalu, H., Berthet, J., Counioux, J. J.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Chemical Sciences
Chemistry
Chemistry and Materials Science
Exact sciences and technology
General and physical chemistry
Inorganic Chemistry
Measurement Science and Instrumentation
Phase equilibria
Physical Chemistry
Polymer Sciences
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Summary:Isoplethic thermal analysis was used to determine the solid-liquid-liquid equilibria in the ternary system water-sodium sulfate-piperidine. The changes in state observed on the thermogram recorded during the displacement in a quasi-binary section permit the identification of the different phases and the delimitation of the corresponding equilibrium domains. Two isotherms were established at 25°C and 40°C because these temperatures frame the peritectic decomposition of the sodium sulfate decahydrate. Miscibility gaps were completely delimited and each critical point was calculated. This study permitted to determine the optimal conditions for separating the organic phase by liquid-liquid extraction.
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-008-9000-8