Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
John R. White1
Date of Patent
September 14, 2010
1Patent Application Number
121898631
Date Filed
August 12, 2008
1Patent Primary Examiner
Patent abstract
A method for producing ammonium metatungstate from ammonium paratungstate includes preparing an ammonium paratungstate mixture including solid ammonium paratungstate and water. The mixture is contacted with a cation exchange material to lower a pH of the mixture to a pH range wherein metatungstate ion is stable and an insoluble tungstic acid is not formed. The pH of the mixture may be maintained in the pH range until the ammonium paratungstate mixture is converted into an ammonium metatungstate solution.
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