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http://dx.doi.org/10.12925/jkocs.2015.32.1.39

The synergistic solvent extraction effect of europium and yttrium using the hexanoic acid -crown ether system  

Sim, Dea-Seon (Korea Research Institutue of Chemical Technology)
Han, Hye-Rim (Korea Research Institutue of Chemical Technology)
Kim, Se-Mi (Korea Research Institutue of Chemical Technology)
Kim, Jeong-Hoon (Korea Research Institutue of Chemical Technology)
Kim, Young-Wun (Korea Research Institutue of Chemical Technology)
Jeong, Noh-Hee (Department of Industrial Engineering Chemistry, Chungbuk National University)
Kang, Ho-Cheol (Korea Research Institutue of Chemical Technology)
Publication Information
Journal of the Korean Applied Science and Technology / v.32, no.1, 2015 , pp. 31-39 More about this Journal
Abstract
The synergistic solvent extraction of rare earth elements such as europium and yttrium has been investigated by the extractant with crown ether as an additive. Macrocyclic ligand as host-guest compounds form more stable complexes with metal ions which have the similar size of the cavity of crown ether. In our previous study[14] founded that the extraction used fatty acid of the various alkyl chain length. Based on the results of the previous experiment, the synergistic separation effect of two metals investigated that the hexanoic acid had was the worst extraction effect which added a crown ether such as 18-crown-6 ether, 15-crown-5 ether, and 12-crown-4 ether. In this study, the concentrations of hexanoic acid have showed the separation effect, and then the concentrations and kind of crown ether are performed for synergistic extraction at the hexanoic acid concentration of the highest separation effect. As a results, the separation rate is the highest value of 1.72 at 0.05 M hexanoic acid, and 0.002M 15-crown-5 ether is the best value in other concentrations and kind of crown ether, it is about twice of using only hexanoic acid. Moreover, the extraction species of two metals has been founded $MLR_3{\cdot}3RH$ form when added the crown ether.
Keywords
europium; yttrium; rare earth element; fatty acid; crown ether; extraction;
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Times Cited By KSCI : 2  (Citation Analysis)
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