Title:
EXTRACTANTS FOR PALLADIUM AND PROCESS FOR SEPARATION AND RECOVERY OF PALLADIUM
Document Type and Number:
WIPO Patent Application WO/2005/083131
Kind Code:
A1
Abstract:
The invention provides novel extractants for palladium which bring about enhancement in the extraction speed as compared with the extraction with DHS (which is one of the current extractants) and a process for the separation and recovery of palladium with the same, particularly, a process which comprises extracting palladium into an organic phase consisting of a sulfur-containing diamide represented by the general formula (1) by the contact with palladium with the organic phase and subjecting the obtained palladium-containing extract to back extraction with an aqueous hydrochloric acid solution containing thiourea to obtain an aqueous solution containing palladium: (1) wherein R1 and R2 are each a group selected from among C1-18 chain hydrocarbon groups (which may be branched), C1-10 alicyclic hydrocarbon groups, and C1-14 aromatic hydrocarbon groups; and R3 is a &lcub (CH2)nS(CH2)m&rcub L group (wherein n, m, and l are each an integer of 1 to 4).
Inventors:
NARITA HIROKAZU (JP)
TANAKA MIKIYA (JP)
TANAKA MIKIYA (JP)
Application Number:
PCT/JP2005/002855
Publication Date:
September 09, 2005
Filing Date:
February 23, 2005
Export Citation:
Assignee:
NAT INST OF ADVANCED IND SCIEN (JP)
NARITA HIROKAZU (JP)
TANAKA MIKIYA (JP)
NARITA HIROKAZU (JP)
TANAKA MIKIYA (JP)
International Classes:
B01D11/04; C07C323/60; C22B3/00; C22B3/34; C22B7/00; C22B11/00; (IPC1-7): C22B11/00; B01D11/04; C22B3/00; C22B7/00
Foreign References:
| JPH0827527A | 1996-01-30 | |||
| JPH06172882A | 1994-06-21 |
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