C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/175, 202/62
C01F 5/30 (2006.01) C01F 5/34 (2006.01)
Patent
CA 1081432
ABSTRACT OF THE DISCLOSURE Anhydrous magnesium chloride may be prepared for magnesium chloride hydrate by the following sequence of process steps: A. Mixing together a magnesium chloride hydrate said hydrate containing minor amounts of water soluble sulfate and boron compounds as impurities with diethyl ether of tetraethylene glycol to prepare 0.1 - 6.0% by weight slurry of MgCl2 in the diethyl ether of tetraethylene glycol and an azeotropic agent having a boiling point less than the diethyl ether of tetraethylene glycol in a quantity sufficient to remove water from said slurry; B. Distilling water from said slurry wherein an anhydrous solution of MgCl2 in diethyl ether of tetraethylene glycol containing the water soluble sulfate and boron compounds as insoluble impurities is formed; C. Separating said MgCl2 solution from the insoluble impurities; D. Adding to the MgCl2 solution about 3.0 moles of ethylene glycol per mole of MgCl2 present so as to prepare a MgCl2.3 moles ethylene glycol complex precipitate; E. Separating said precipitate from the diethyl ether of tetraethylene glycol and recovering the precipitate; F. Dissolving said precipitate in ethylene glycol to prepare a solution of the precipitate in ethylene glycol said ethylene glycol being used in a quantity so as to prepare an ethylene glycol solution containing from 1 to 20% by weight MgCl2; G. Treating the ethylene glycol magnesium chloride solution with ammonia to form a magnesium chloride-ammonia complex which is insoluble in the ethylene glycol with the temperature of the ethylene glycol magnesium chloride solution being within the range of between -15 to 50°C; H. Separating the magnesium chloride-ammonia complex with a polar solvent having a lower boiling point than ethylene glycol to remove any ethylene glycol entrained in the magnesium chloride-ammonia complex; J. Heating the magnesium chloride-ammonia complex to a temperature sufficient to drive off the ammonia for a sufficient period of time to remove the ammonia, thereby forming anhydrous magnesium chloride; and then K. Recovering anhydrous magnesium chloride which has magnesium oxide content of less than 0.8% by weight and which is substantially free of impurities. - 2 -
271621
Allain Ronald J.
Braithwaite David G.
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