Efficient ammoximation and regeneration of degraded hydroxyoxime CP150 over TS-1 molecular sieve/H2O2 system and reuse for solvent extraction of Cu(II)

Abstract

The regeneration of failed hydroxyoxime extractants in the copper hydrometallurgy industry is crucial. However, the existing regeneration system has limitations in terms of operability, yield, and environmental friendliness, which restricts its industrial application. This paper presents a clean one-pot ammoximation regeneration system for the in-situ preparation of hydroxylamine for the oximation of aldehydes, catalyzed by TS-1 with NH₃ and H₂O₂. It was tailored based on the characteristics of the degraded organic phase produced by long-term operation at the copper solvent extraction site. The developed system demonstrates an excellent regeneration conversion efficiency (>90%) for the degraded copper-extracted organic phase. Following regeneration, the copper extraction efficiency of the organic phase reaches the same level as the fresh organic phase and maintains good copper extraction stability even after multiple extraction cycles. Moreover, the phase separation performance was improved through optimization. This regeneration system meets the demand for environmentally friendly and resourceful utilization of degraded waste organic phases in copper extraction systems.