No abstract

Split-anion extraction with water-saturated ionic liquids is a benign, efficient and selective process for recovery of precious metals from chloride media.

1An effective solvent extraction-based method has been developed to recover individually platinum 2 group metals (PGMs) (i.e. Pd, Pt and Rh) with high purity from acidic chloride media using 3 phosphonium-based ionic liquid Cyphos IL 101 ([P 66614 ] + Cl -) diluted in xylene used as a model of 4 industrial diluents such as SOLVESSO 150. The system showed the selective co-extraction of Pd(II) 5 and Pt(IV) from a feed solution containing 100 mg L −1 Pt(IV), 55 mg L −1 Pd(II), and 25 mg L −1 Rh(III) 6in HCl via an anion exchange mechanism, leaving Rh(III) in the raffinate. A McCabe-Thiele diagram 7 demonstrated the quantitative extraction of Pd(II) and Pt(IV) with 0.6 g L −1 [P 66614 ] + Clwith two 8