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Received April 28, 2003
Accepted July 21, 2003
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Selective Recovery of Palladium from Used Aqua Regia by Hollow Fiber Supported with Liquid Membrane
Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Phayathai Road, Patumwan, Bangkok 10330, Thailand
ura.p@chula.ac.th
Korean Journal of Chemical Engineering, November 2003, 20(6), 1092-1096(5)
https://doi.org/10.1007/BF02706942
https://doi.org/10.1007/BF02706942
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Abstract
This research study was aimed at recovering palladium from used aqua regia by means of a hollow fiber thoroughly supported with liquid membrane. The liquid membrane, consisting of two extractants--thioridazine·HCl and oleic acid-solubilized in chloroform--was used to coat the microporous hollow fiber throughout. Sodium nitrite, a stripping agent, which was fed through the shell side, flowed counter-currently with the feed solution fed via the tube side. The following factors were investigated: the concentrations of the two extractants and of sodium nitrite, the pH of used aqua regia, the flow rates of both the feed and stripping solution, and the number of runs in the hollow fiber module. It was found that after a 30-minute operation, 29.10% of palladium ion was optimally recovered at 0.0005- M thioridazine and 0.05-M oleic acid. With reference to the precious metals recovered, the following order was recorded: Pd(II) > Pt(IV) > Cu(II) > Au(III). It was observed that synergistic extraction could be gained at the concentration level of the extractants, regulated in the experiment. The liquid membrane system had long-term stability and even after the third run, it could still recover palladium up to 65%.
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