EQUILIBRIUM DISTRIBUTION OF PALLADIUM(I I) BETWEEN HYDROCHLORIC ACID SOLUTION AND A MACROMOLECULAR RESIN CONTAINING TRI-n-OCTYLAMINE |
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| Authors: | Shigendo AKITA Koji HIRANO Yoshiaki OHASHI Hiroshi TAKEUCHI |
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| Affiliation: | 1. Nagoya Municipal Industrial Research Institute , Rokuban, Atsuta-ku, Nagoya, 456, Japan;2. Department of Chemical Engineering , Nagoya University , Chikusa-ku, Nagoya, 464-01, Japan |
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| Abstract: | ABSTRACT Studies have been conducted on the sorption characteristics of palladium (II) from hydrochloric acid media with a macromolecular resin containing tri-n-octylamine (TOA). Sorption equilibrium of Pd (II) on the TOA-impregnated sorbent can be expressed by a simple ion-exchange reaction between a tetrachloro complex of Pd (II) in the aqueous phase and an amine salt in the sorbent as follows:  where the equilibrium constant was found to be 6.98x104 kg/dm3. The elution of Pd (II) from the metal-loaded sorbent was also examined. Elution can be attained with either hydrochloric acid or aqueous ammonia: in particular, the latter gave a high elution ratio even at a concentration less than 1M. The effect of the pore diameter of the macromolecular resins on the Pd(II) sorption was also studied and two methods for preparating impregnated sorbent were examined. |
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