Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1981-03-03
1982-06-15
Therkorn, Ernest G.
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210667, 210711, 423112, 423139, 423157, 75101BE, 75121, B01D 1100, C02F 126, C02F 142
Patent
active
043349994
ABSTRACT:
A process for extracting metal ions from a water insoluble metal base or salt dispersed in an aqueous solution using liquid ion exchange is described. The liquid ion exchange extractant is an alkyl phosphoric acid or acid phosphate (APA) which is dissolved in a water immiscible organic solvent. In contrast to prior art processes where the metal ion is dissolved in an aqueous solution, the insoluble metal base or salt is one which is reactive from an aqueous solution with the APA to replace one of the acid hydrogens to form an alkyl phosphate metal salt (APS) in the organic solvent. The metal ion can be recovered from the APS in the organic solvent by stripping with an aqueous acidic solution so that the metal ion is removed from the APS to form a metal salt in the aqueous acidic solution and the APA in the organic solvent is regenerated for reuse. The process is particularly adapted to producing alum from aluminum hydroxide which is dispersed in an aqueous sludge resulting from precipitation or coagulation with alum in potable water clarification. The aluminum ion is extracted by the APA from the aluminum hydroxide and then recovered by using an aqueous solution of sulfuric acid to remove the aluminum ion and to form aluminum sulfate in an acidic aqueous solution, referred to as "liquid alum", which can be reused.
REFERENCES:
patent: 2860031 (1958-11-01), Grinstead
patent: 3649209 (1972-03-01), Coleby
patent: 3959133 (1976-05-01), Fulton
patent: 4008134 (1977-02-01), Thorsen
Zoltek and Corwell, Recycling of Alum Used for Phosphorus Removal in Domestic Water Treatment, JWPCF, Apr. 1977, 600-612.
Board of Trustees, Michigan State University
McLeod Ian C.
Therkorn Ernest G.
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