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Liquid-liquid extraction/separation of platinum(IV) and rhodium(III) From Acidic Chloride Solutions Using Tri-Iso-Octylamine

Liquid-liquid extraction/separation of platinum(IV) and rhodium(III) From Acidic Chloride Solutions Using Tri-Iso-Octylamine

Jin-Young Lee, J Rajesh Kumar, Joon-Soo Kim, Hyung-Kyu Park, Ho-Sung Yoon

J Hazard Mater. 2009 Aug 30;168(1):424-9.

PMID: 19285802

Abstract:

Liquid-liquid extraction/separation of platinum(IV) and rhodium(III) from acidic chloride solutions was carried out using tri-iso-octylamine (Alamine 308) as an extractant diluted in kerosene. The percentage extraction of platinum(IV) and rhodium(III) increased with increase in acid concentration up to 8 mol L(-1). However, at 10 mol L(-1) HCl concentration, the extraction behavior was reversed, indicating the solvation type mechanism during extraction. The quantitative extraction of approximately 98% platinum(IV) and 36% rhodium(III) was achieved with 0.01 mol L(-1) Alamine 308. The highest separation factor (S.F.=184.7) of platinum(IV) and rhodium(III) was achieved with 0.01 mol L(-1) Alamine 308 at 1.0 mol L(-1) of hydrochloric acid concentration. Alkaline metal salts like sodium chloride, sodium nitrate, sodium thiocyanate, lithium chloride, lithium nitrate, potassium chloride and potassium thiocyanate used for the salting-out effect. LiCl proved as best salt for the extraction of platinum(IV). Temperature effect demonstrates that the extraction process is exothermic. Hydrochloric acid and thiourea mixture proved to be better stripping reagents when compared with other mineral acids and bases.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS732636	Rhodium(III) nitrate solution			Price

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