Patent ID: 6107523
Filing Date: 2000-08-22
Classification: C07C

Abstract:
In a process for recovery of copper from an aqueous ammoniacal solution containing copper values comprising:(A) contacting a copper pregnant aqueous ammoniacal solution containing copper values with a water insoluble beta-diketone copper extractant dissolved in a water-immiscible organic solvent to extract copper values from said aqueous ammoniacal solution into said organic solution thereby forming a copper pregnant organic phase and a copper depleted aqueous phase;(B) separating said aqueous phase and said organic phase;(C) contacting the copper pregnant organic phase with an aqueous acidic stripping solution;(D) separating said aqueous acidic stripping solution now containing the copper values from the organic phase; and(E) recovering the copper from said aqueous acidic stripping solution;wherein the improvement comprises said water insoluble beta-diketone extractant being a highly sterically hindered beta-diketone.