Process for making anhydrous magnesium chloride
AssigneeAlcan International Limited
InventorsOlivo G. Sivilotti, Jean V. Sang, Rejean J. R. Lemay
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Abstract
In a process for producing anhydrous magnesium chloride, the following combination of steps: drying impure salt containing hydrated magnesium chloride; establishing a solution of the hydrated magnesium chloride; removing insoluble impurities; reacting the solution of hydrated magnesium chloride at substantially ambient temperature and pressure by feeding it into an ammonia saturated very low boiling point alcohol solution and in the presence of ammonium chloride while maintaining the last-mentioned solution saturated in ammonia thereby to form a precipitate of ammoniated magnesium chloride; separating the precipitate and heating it to obtain anhydrous MgCl.sub.2 and ammonia for recycling.
Claims18
A process for obtaining anhydrous magnesium chloride, as a product, from a hydrated magnesium chloride, comprising
- (a) establishing a solution of hydrated magnesium chloride;
- (b) reacting said solution of hydrated magnesium chloride at substantially ambient pressure and at a temperature between 10.degree. and 60.degree. with a mixture containing ammonium chloride and ammonia saturated alcohol, said alcohol having a boiling point of 100.degree. C. or less to form a precipitate of ammoniated magnesium chloride;
- (c) separating the precipitate of ammoniated magnesium chloride;
- and
- (d) decomposing the separated precipitate into anhydrous magnesium chloride, as said product, and ammonia.
A process for making anhydrous magnesium chloride, comprising, in combination:
- (a) drying impure salt containing hydrated magnesium chloride while maintaining the magnesium chloride at least partially hydrated;
- (b) dissolving the dried salt in an alcohol having a boiling point of 100.degree. C. or less together with ammonium chloride, to establish a magnesium salt solution containing the at least partially hydrated magnesium chloride;
- (c) removing insoluble impurities from said magnesium salt solution containing the at least partially hydrated magnesium chloride;
- (d) reacting said solution containing the at least partially hydrated magnesium chloride at substantially ambient pressure and at a temperature between 10.degree. and 60.degree. with a mixture containing ammonium chloride and ammonia saturated alcohol, said alcohol having a boiling point of 100.degree. C. or less to form a precipitate of ammoniated magnesium chloride;
- (e) separating the precipitate of ammoniated magnesium chloride;
- and
- (f) heating the separated precipitate to obtain anhydrous MgCl.sub.2 and ammonia for recycling.
Dependencies are inferred from the claim text.