Removal of nickel from cobalt and manganese
AssigneeStandard Oil Company (Indiana)
InventorWalter Partenheimer
Life of this patent
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Abstract
This invention relates to the removal of nickel, iron and copper co-dissolved with cobalt or manganese, or cobalt and manganese in water so that cobalt, manganese, or cobalt and manganese can be precipitated as carbonates and then converted to their acetates sufficiently low in nickel, iron and copper so that said acetates can be recycled to the liquid phase air oxidation of a di- or trimethyl benzene to its corresponding di- or tricarboxylic acid without material inhibition of such oxidation.
Claims4
The method of recovery of cobalt or manganese or cobalt and manganese dissolved in water also containing ions of copper, iron and nickel in amounts of copper above 80 to 100 weight parts, of nickel above 6700 weight parts and of iron above 500 to 5000 weight parts each per million weight parts of cobalt by precipitating cobalt, manganese or cobalt and manganese as their carbonates, the improvement of adding to the aqueous solution before the carbonate precipitation at least 2.5 moles of nitrilotriacetate per 1.0 gram mole of total of said metals.
Dependencies are inferred from the claim text.