Add time:07/23/2019         Source:sciencedirect.com

The kinetics and mechanism of the isothermal decomposition of magnesium chloride dihydrate in nitrogen have been studied between 623–803 K. The principal products of reaction were identified as MgO and HCl: the progress of reaction was monitored by titrating the acid evolved with standard alkali. The stoichiometry is satisfactorily represented by MgCl2·2H2O → MgO + 2HCl + H2O The effects of prevailing water vapour pressure, reaction temperature and sample precrushing were investigated. Electron microscopy was used to examine the textures of partly and fully decomposed salts, confirming that reaction proceeded in the solid state. The kinetic observations fitted the contracting area rate equation from which the activation energies were found to be 110 ± 5 kJ mol−1 in dry N2 and 75 ± 7 kJ mol−1 in 10 Torr water vapour.The mechanism of this decomposition is discussed with consideration of the close similarity of kinetic behaviour with that of the reaction of MgCl2 (anhydrous) with O2.

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