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US 4,066,518 AGranted
Production of potassium or sodium stannate
AssigneePitt Metals and Chemicals, Inc.
InventorRichard E. Horn
Life of this patent
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Abstract
Alkali metal stannates are produced in an electrochemical process by dissolving a tin anode in an appropriate alkali metal hydroxide in the anode compartment of an electrodialytic cell. The anode compartment of the electrodialytic cell is separated from a cathode compartment by an anionic or a cationic permselective ion exchange membrane. The tin is dissolved in the anode compartment in the stannous form and after reacting with the alkali metal hydroxide is oxidized to the stannic form to produce the desired alkali metal stannate.
Claims13
An electrochemical process for the manufacture of alkali metal stannates comprising,
- anodically dissolving stannous tin into an alkali metal electrolyte to form an alkali metal stannite,
- simultaneously preventing the stannite from migrating from the anode to the cathode by interposing therebetween a permselective ion exchange membrane,
- oxidizing said alkali metal stannite with an oxygen containing gas to an alkali metal stannate, and
- recovering said alkali metal stannate from said electrolyte.
1 more element
Dependencies are inferred from the claim text.