Solvent Extraction of Palladium(II) from Aqueous Chloride Medium by Triphenylphosphine, Triphenylphosphine Oxide or Triphenylphosphine Sulphide in Benzene

The results indicate the possibility of separation of Pd from a synthetic chloride solution similar in composition to that expected from the leaching of spent automotive catalyst.12 Solvent extraction separation and recovery of Pd and platinum (Pt) from hydrochloric acid leach liquors of spent automobile catalyst employing precipitation and solvent extraction methods were also studied.13 Separation of Pd from high level liquid waste (HLLW) solution originated from the reprocessing of spent fuel by the PUREX process was carried out by solvent extraction and precipitation methods using oximes.14 The solvent extraction and separation performances of Pd(II) and Pt(IV) from hydrochloric acid solutions were investigated using dibutyl sulfoxide (DBSO) diluted in kerosene.15 The extraction behaviour of Pd(II) was studied with LIX 84I (2-hydroxy-5-nonylacetophenone oxime) in HCl medium16 and was found to be 97%. [...]most probably palladium is mainly bonded to the phosphorus atom of Ph3P, which restricts the stretching vibrations of phenyl groups of Ph3P, supporting the extraction equilibrium proposed. 4.