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US 4,105,747 AGranted
Method for dehydrating metal chlorides
AssigneeThe United States of America as represented by the Secretary of the Interior
InventorsJudith A. Eisele, Donald J. Bauer
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Abstract
A hydrated metal salt is dehydrated to its anhydrous form by dissolving the metal salt hydrate in an organic solvent; and contacting the solvent solution of metal salt hydrate with a molecular sieve of a pore size sufficient to permit the absorption of water molecules but of a size too small to absorb solvent molecules.
Claims1
A method for dehydrating a hydrated metal salt, from the group consisting of ZnCl.sub.2, MnCl.sub.2, PrCl.sub.3 AlCl.sub.3, MgCl.sub.2 and FeCl.sub.3, comprising:
- dissolving said hydrated metal salt in an organic solvent consisting essentially of a lower aliphatic alcohol,
- contacting the resulting solution with a crystalline aluminosilicate molecular sieve having a pore size of about 3 to 5 angstroms, sufficient to permit absorption of water molecules but not solvent molecules, at ambient temperature and for a time sufficient to permit substantially complete absorption of water from the hydrated metal salt, and
- separating the resulting organic solvent solution of substantially anhydrous metal salt from the molecular sieve.
Dependencies are inferred from the claim text.