Documents disponibles écrits par cet auteur

Selective extraction of palladium and platinum from hydrochloric acid solutions by trioctylammonium - based mixed ionic liquids / Shoichi Katsuta in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12735–12740 Titre : Selective extraction of palladium and platinum from hydrochloric acid solutions by trioctylammonium - based mixed ionic liquids Type de document : texte imprimé Auteurs : Shoichi Katsuta, Auteur ; Yuki Yoshimoto, Auteur ; Miho Okai, Auteur Année de publication : 2012 Article en page(s) : pp. 12735–12740 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ionic  liquid  Selective  extraction Résumé : Mixtures of the protic ionic liquids trioctylammonium bis(trifluoromethanesulfonyl)amide ([TOAH][NTf2]) and trioctylammonium nitrate ([TOAH][NO3]) were investigated as extractants for platinum-group elements. The mixture of 10wt% [TOAH][NO3] in [TOAH] [NTf2] has low viscosity (274.2 mPas) and low aqueous solubility (2.6 x 10-5 mol dm-3 as the cation). With the ionic liquid mixture, Pd(II) and Pt(IV) were extracted almost quantitatively from 0.10 mol dm-3 hydrochloric acid. Under the same conditions, Na(I), Mg(II), K(I), Ca(II), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Ru(III), Rh(III), and Cd(II) were only slightly extracted. It was found that the extraction of Pd and Pt increases with increasing content of [TOAH][NO3] in the mixture. The metals could be back-extracted from the ionic liquid mixture with nitric acid solution, and selective stripping of Pt was possible by controlling the concentration of nitric acid. The metal extractability of the ionic liquid mixture after the back-extraction was equivalent to that of the fresh mixture, indicating that the species composition of the mixture returned to the original state through the back-extraction process. This extraction system provides an efficient separation method for Pd and Pt in acidic chloride media using ionic liquid mixtures, which are recyclable, easy to handle, safe, and environmentally friendly. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745747 [article] Selective extraction of palladium and platinum from hydrochloric acid solutions by trioctylammonium - based mixed ionic liquids [texte imprimé] / Shoichi Katsuta, Auteur ; Yuki Yoshimoto, Auteur ; Miho Okai, Auteur . - 2012 . - pp. 12735–12740. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12735–12740 Mots-clés : Ionic  liquid  Selective  extraction Résumé : Mixtures of the protic ionic liquids trioctylammonium bis(trifluoromethanesulfonyl)amide ([TOAH][NTf2]) and trioctylammonium nitrate ([TOAH][NO3]) were investigated as extractants for platinum-group elements. The mixture of 10wt% [TOAH][NO3] in [TOAH] [NTf2] has low viscosity (274.2 mPas) and low aqueous solubility (2.6 x 10-5 mol dm-3 as the cation). With the ionic liquid mixture, Pd(II) and Pt(IV) were extracted almost quantitatively from 0.10 mol dm-3 hydrochloric acid. Under the same conditions, Na(I), Mg(II), K(I), Ca(II), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Ru(III), Rh(III), and Cd(II) were only slightly extracted. It was found that the extraction of Pd and Pt increases with increasing content of [TOAH][NO3] in the mixture. The metals could be back-extracted from the ionic liquid mixture with nitric acid solution, and selective stripping of Pt was possible by controlling the concentration of nitric acid. The metal extractability of the ionic liquid mixture after the back-extraction was equivalent to that of the fresh mixture, indicating that the species composition of the mixture returned to the original state through the back-extraction process. This extraction system provides an efficient separation method for Pd and Pt in acidic chloride media using ionic liquid mixtures, which are recyclable, easy to handle, safe, and environmentally friendly. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745747