Kinetic analysis of thermal dehydration and hydrolysis of MgCl2·6H2O by DTA and TG

Yoram Kirsh, S. Yariv, Shlomo Shoval

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The thermal decomposition of MgCl2·6H2O (non-dried and partly dried) and the kinetics of the process were studied by DTA, TG, DTG, IR, X-ray diffraction and chemical analysis of Mg and Cl. The reactions which occurred in the course of the thermal analysis were identified as dehydration (in steps), thermal hydrolysis of MgCl2·H2O and dehydrochloridization of magnesium hydroxy chlorides. Melting of the phases MgCl2·6H2O, MgCl2·4H2O and MgCl2 was also identified in the thermal curves. Thermal weight loss continued up to 800 °C in flowing air or nitrogen, but only up to 700 °C in static air. MgO was the end-product of thermal treatment in both cases. The kinetic parameters of the reaction, the activation energy E, pre-exponential factor A and apparent order of reaction b, were computed by several methods. The activation energy and the apparent reaction order of dehydration were found to increase with decreasing hydration number of the Mg. The dehydrochloridization process had the highest activation energy.

Original languageEnglish
Pages (from-to)393-408
Number of pages16
JournalJournal of Thermal Analysis
Issue number2
StatePublished - Mar 1987


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