Extraction of Cu(II), Fe(III), Ni(II), Co(II), Cd(II), Zn(II), Ca(II) and Mg(II) metal values using 2-hydroxy iminoacetic acids
AssigneeShell Oil Company
InventorsRiekert Kok, Abraham J. VAN DER Zeeuw
Life of this patent
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Abstract
Novel 2-hydroxyiminoacetic acids of the formula ##STR1## where R is an aromatic hydrocarbyl group substituted with one or more aliphatic chains of at least four carbon atoms are excellent for the extraction of metal values from acidic metal - containing aqueous solutions, particularly for the separation of Cu from Fe, Ni from Co and Ca from Mg.
Claims6
In the process of selectively extracting at least one metal value of the group consisting of copper (II), iron (III), nickel (II), cobalt (II), cadmium (II), zinc (II), calcium (II) and magnesium (II) from an acidic aqueous medium using an organic solvent and a complexing agent at a pH between about 0.0 and about 4.5, separating organic and aqueous layers and extracting the metal ions from the organic layer with a mineral acid solution, the improvement which consists of using as the complexing agent a compound having the formula ##STR7## where R is an aryl group having between 1 and 3, inclusive, aliphatic groups attached thereto, where the total aliphatic carbons are at least 4.
Dependencies are inferred from the claim text.