Process and composition for removal of metal ions from aqueous s

Details Process and composition for removal of metal ions from aqueous s Process and composition for removal of metal ions from aqueous s

1986-12-04

1988-05-03

Hruskoci, Peter A.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210641, 210651, 210912, 210913, 210914, B01D 1300

Patent

active

047418311

ABSTRACT:
The present invention relates to a cyclic continuous process and composition for the removal of metal ions, particularly transition metal ions, from aqueous solutions a fluid stream containing the metal ions is contacted with an aqueous solution of a water soluble organic polymeric chelant. The metal is chelated by the chelant: The separation of water and low molecular weight products (molecular weight less than 500) is accomplished usually by dialysis or ultrafiltration. The metal ion is then released using dilute mineral acid and collected. The water-soluble chelant is then recycled. The metal ions chelated removed included iron, cobalt, copper, vanadium, cadmium, nickel, zinc, lead, and aluminum. A preferred chelant is one having a pendant pyridine group in conjunction with alkyl amine groups, e.g., --N(R)--CH.sub.2 --C.sub.5 H.sub.4 N, where R is alkyl.

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