Process for removal of copper from solutions of chelating agent and copper
AssigneeEco-Tec Limited
InventorsCraig J. Brown, Michael J. Dejak
Life of this patent
Estimating the term…
Abstract
A process is provided for removing copper from a solution containing same with a chelating agent. The process is advantageously practiced on aqueous effluents from electroless plating systems to remove copper from an aminopolycarboxylic acid chelating agent such as ethylene diaminetetraacetic acid (EDTA). The process comprises contacting an acidic solution containing copper, and optionally ferric iron ions, and the chelating agent with a water insoluble ion exchange resin having a picolylamine or a pyridyl-imidozole functionality, whereby copper is selectively retained by the resin and the chelating agent remains in solution, and then removing the solution from the resin.
Claims24
A process for removing copper ions from an acidic solution containing copper and an aminopolycarboxylic acid chelating agent, comprising:
- contacting the acidic solution with a water insoluble ion exchange resin having a picolylamine or a pyridyl-imidazole functionality, whereby copper ions are retained by the resin and the chelating agent remains in the solution;
- and
- removing the solution containing the chelating agent from the resin, said solution having a reduced content of copper.
Dependencies are inferred from the claim text.