Simple Amides and Amines for the Synergistic Recovery of Rhodium from Hydrochloric Acid by Solvent Extraction.

ABSTRACT: The separation and isolation of many of the platinum group metals (PGMs) is currently achieved commercially using solvent extraction processes. The extraction of rhodium is problematic however, as a variety of complexes of the form [RhCl_n (H₂ O)_6-n ]^(n-3)- are found in hydrochloric acid, making it difficult to design a reagent that can extract all the rhodium. In this work, the synergistic combination of a primary amine (2-ethylhexylamine, L^A ) with a primary amide (3,5,5-trimethylhexanamide, L¹ ) is shown to extract over 85 % of rhodium from 4 M hydrochloric acid. Two rhodium complexes are shown to reside in the organic phase, the ion-pair [HL^A ]₃ [RhCl₆ ] and the amide complex [HL^A

SUBMITTER: Carrick AI 

PROVIDER: S-EPMC8252629 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature