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    • 20. 发明授权
    • Anhydrous magnesium chloride process
    • 无水氯化镁工艺
    • US3983224A
    • 1976-09-28
    • US680403
    • 1976-04-26
    • Ronald J. AllainDavid G. Braithwaite
    • Ronald J. AllainDavid G. Braithwaite
    • C01F5/30C01F5/34
    • C01F5/34
    • 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 MgCl.sub.2 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 MgCl.sub.2 in diethyl ether of tetraethylene glycol containing the water soluble sulfate and boron compounds as insoluble impurities is formed;C. separating said MgCl.sub.2 solution from the insoluble impurities;D. adding to the MgCl.sub.2 solution about 3.0 moles of ethylene glycol per mole of MgCl.sub.2 present so as to prepare a MgCl.sub.2.3 moles ethylene glycol complex precipitate;E. separating precipitate pecipitate 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 MgCl.sub.2 ;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.degree. to 50.degree.C;H. separating the magnesium chloride-ammonia complex from the ethylene glycol;I. washing the magnesium chloride-ammonia complex with a polar solvent having a lower boiling point than ethylene glycol to remove any ethlene 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 a magnesium oxide content of less than 0.8% by weight and which is substantially free of impurities.
    • 可以通过以下顺序的步骤制备氯化镁水合物的无水氯化镁: