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Solid-Liquid Phase Equilibria in the System NH4Cl-MgCl2-H2O at Elevated Temperatures the Pseudobinary System MgCl2.6H2O - NH4Cl

T. Fanghänel, H. Voigt, and H.-H. Emons

Karlsruhe Centre for Nuclear Research, Institute of Nuclear Waste Technology, W-7500 Karlsruhe, Germany

 

Abstract: The solid-liquid phase equilibria of the pseudobinary system MgCl2 . 6H2O-NH4Cl were determined in the temperature range 120-250°C. Between 120-183°C ammonium carnallite NH4Cl . MgCl2 . 6H2O forms the stable solid phase, which melts congruently at 183-degrees-C. At higher temperatures solid solutions of the composition (NH4Cl)6.65 . MgCl2 . 2H2O are stable. The NH4Cl/MgCl2 mole ratio of the solid solutions is almost independent of temperature, if the H2O/MgCl2 mole ratio of the liquid phase is kept constant.

Full paper in Portable Document Format: 466a374.pdf

 

Chemical Papers 46 (6) 374–377 (1992)

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