EXTRACTION OF PALLADIUM(II) AND PLATINUM(IV) AS CHLOROCOMPLEX ACIDS INTO BASIC ORGANIC SOLVENTS
- 1 December 1991
- journal article
- research article
- Published by Taylor & Francis in Solvent Extraction and Ion Exchange
- Vol. 9 (5) , 759-768
- https://doi.org/10.1080/07366299108918083
Abstract
Solvent extraction of platinum(IV) and palladium(II) with tri-n-octylamine(TOA) in o-xylene from 4.0M (Na,H)(Cl, HSO4) has been investigated at 298K in order to compare with similar extraction by trioctylphosphine oxide(TOPO). The dependence of the distribution ratio of platinum(IV) and pal 1adium(II) on TOA, hydrogen ion and chloride ion concentrations suggests the dominant extracted species of these metals would be 2:1 for proto-nated amine : chlorocomplex anion and the extraction should be essentially anion exchange reaction. The extraction constants (Kex = D[H+(T0A)C1 ] 2[C1 ]2), were evaluated as 106-3 and 105.8 for platinum(IV) and pal ladium(II), respectively. The anion exchange with protonated TOPO salt represented by H(T0P0)2 +C1 is less than that with protonated TOA salt by a factor of one order.Keywords
This publication has 5 references indexed in Scilit:
- Extraction Equilibria of Hydrochloric Acid by Trioctylamine in Low-Polar Organic SolventsBulletin of the Chemical Society of Japan, 1987
- Solvent extraction equilibria of acids—II: Extraction of phosphoric acid from various aqueous solutions with trioctylphosphine oxideJournal of Inorganic and Nuclear Chemistry, 1976
- Extraction of HReO4, HClO4 and HAuCl4 by trioctylphosphine oxide in benzene, 1,3,5-triethylbenzene and chloroformJournal of Inorganic and Nuclear Chemistry, 1971
- Activity coefficients, aggregation, and thermodynamics of tridodecylammonium salts in nonpolar solventsThe Journal of Physical Chemistry, 1968
- Extraction of Metals from Chloride Solutions and Amines.Journal of Chemical & Engineering Data, 1966