Chemistry of inorganic compounds – Halogen or compound thereof – Binary compound containing metal
Patent
1979-02-16
1980-10-14
Thomas, Earl C.
Chemistry of inorganic compounds
Halogen or compound thereof
Binary compound containing metal
423351, C01F 530, C01F 534
Patent
active
042281440
ABSTRACT:
Anhydrous magnesium chloride containing substantially no magnesium oxide is produced by a process comprising reacting magnesium chloride in the form of its hexahydrate with ammonia in the presence of ammonium chloride in an aqueous media; separating the resultant precipitated magnesium chloride hexammoniate crystals from an aqueous solution containing unreacted ammonia, magnesium chloride and ammonium chloride; washing the crystals with liquid ammonia; decomposing the washed crystals into anhydrous magnesium chloride and gaseous ammonia, and; isolating the anhydrous component from the composition mixture; which process is characterized in that a portion of the separated aqueous solution is evaporated until the concentration of ammonia in the resulting residual liquid becomes 2.5% or less; the residual liquid is mixed with fresh magnesium chloride so as to dissolve it in the liquid; the resultant solution is fed into the reacting step, and; the remaining portion of the separated aqueous solution is directly recycled into the reacting step.
REFERENCES:
patent: 3092450 (1963-06-01), Christensen et al.
Kono Hisashi
Niwa Takazumi
Oda Tetsuya
Terai Kenji
Uemura Katsumi
Thomas Earl C.
UBE Industries Ltd.
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