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Title: Extraction and Separation of Platinum (IV), and Palladium (II) with CYANEX 923 in Chloride Media— A Possible Recovery from Spent Autocatalysts
Authors: Chavan, Devendra V
Dhadke, Purushottam M
Keywords: Cyanex 923;Extraction;Pt (IV);Pd (II);Separation;Spent autocatalysis;Platinum (IV);Palladium (II)
Issue Date: Aug-2003
Publisher: NISCAIR-CSIR, India
Abstract: Extraction and separation of Pt(IV) and Pd(II) was carried out with Cyanex 923 in chloride media. Pt (IV) was quantitatively extracted from 3.0- 8.0 M HCI in the presence of 0.01 M SnCl2 while Pd (II) from 4.0-5.0 M HCI with 5×10-3 M Cyanex 923 in toluene. Pt (IV) was then quantitatively stripped from the organic phase with 5.0 M HNO3 while Pd (II) was quantitatively stripped with 1:1 HCI + HCIO4 in single step and also with 7.0 M HCIO4 in two steps. Pt (IV) was also extracted without using SnCI2 as a labilising agent with 0.1 M Cyanex 923 in toluene at 2.0-3.0 M HCI. Separation of Pt (IV) and Pd (II) was observed in various ratios. The methods developed were applied to the recovery of these metal ions from a synthetic solution of similar in composition to that of leaching of spent autocatalysis in 6.0 M HCI.
Page(s): 834-837
ISSN: 0975-1084 (Online); 0022-4456 (Print)
Appears in Collections:JSIR Vol.62(08) [August 2003]

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