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Formation and extraction of Rh–Sn–Cl complexes with an alkylated 8-hydroxyquinoline

✍ Scribed by Elyse Benguerel; George P. Demopoulos

Publisher
Wiley (John Wiley & Sons)
Year
1998
Tongue
English
Weight
232 KB
Volume
72
Category
Article
ISSN
0268-2575

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✦ Synopsis

The work presented here focuses on the solution pretreatment and extraction stages of a solvent extraction system for rhodium from aqueous chloride solutions. The feed solution pretreatment stage involves a complexation reaction between the aqueous rhodium chloride complexes, and stannous chloride. Depending on the amount of RhCl 6~x (H 2 O) x s tannous chloride used, at least two di †erent RhÈSn complexes are formed, either or Both of these respond well to extraction [Rh(SnCl 3 ) 5 )]4~[RhCl 3 (SnCl 3

) 3 ]3~. with Kelex 100, the extractant investigated in this work. The extraction stage was found to be quantitative for rhodium and it was also found to be very rapid, with contact times of less than 5 min sufficient for rhodium extraction. The extraction mechanism was determined to be ion-pair formation with the protonated Kelex 100 molecules at a stoichiometry such that the overall charge in the organic phase is neutral, i.e. three Kelex 100 molecules for and four [RhCl 3 (SnCl 3 ) 3 ]3f or 1998 SCI [Rh(SnCl 3 ) 5 ]4~.

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