Extraction of Rh(III) from hydrochloric acid by protonated NTAamide(C6) and analogous compounds and understanding of extraction equilibria by using UV spectroscopy and DFT calculations

Sasaki, Yuji; Kaneko, Masashi; Ban, Yasutoshi; Kinoshita, Ryoma; Matsumiya, Masahiko*; Shinoku, Kota*; Shiroishi, Hidenobu*

Analytical Sciences, 39(9), p.1575 - 1583, 2023/09

https://doi.org/10.1007/s44211-023-00376-8

Extraction of Rh from HCl can be performed by NTAamide(C6) (hexahexyl-nitrilotriacetamide) and other related compounds into n-dodecane. We use ion-pair extraction of anionic species of Rh-chloride and protonated extractant. Rh behave as anion in hydrochloric acid and the tertiary nitrogen atom in extractant may be protonated to produce the quaternary amine in acidic condition. From the present work, the maximum distribution ratio of Rh(III) is 16. The D(Rh) values are changeable during preparation of the aqueous solutions because different Rh-Cl-HO complexes are formed in HCl media and show the slow exchange rate between Cl and HO. Using the UV spectrum, Rh-chloride solution having the peak of spectrum at 504 nm can be extracted effectively, where RhCl(HO) and RhCl(HO) exist mainly from DFT calculation. Stoichiometry of one-one complex of Rh and NTAamide is obtained from slope analysis, and 85 mM of concentrated Rh ion can be extracted.

Anion exchange behaviour of the transplutonium elements in hydrochloric acid-alcohol media at elevated temperature

Journal of Radioanalytical and Nuclear Chemistry, 111(2), p.477 - 485, 1987/02

https://doi.org/10.1007/BF02072879

no abstracts in English

Inorganic extraction studies on the system between bis (2-ethyl hexyl)-ortho-phosphoric acid and hydrochloric acid, 2

Bulletin of the Chemical Society of Japan, 34(1), p.63 - 68, 1961/00

https://doi.org/10.1246/bcsj.34.63

no abstracts in English

Studies on countercurrent extraction of radionuclides, 1; Countercurrent separation of fission products in the system tri-n-butyl phosphate-hydrochloric acid

; H.M.Sammour*

Nihon Genshiryoku Gakkai-Shi, 3(5), p.344 - 352, 1961/00

https://doi.org/10.3327/jaesj.3.344

no abstracts in English

Solvent extraction behavior of inorganic ions in the alkylamines-hydrochloric acid systems; Amberlite LA-1 and tri-iso-octylamine

; H.M.Sammour*; ; ; *

Nihon Genshiryoku Gakkai-Shi, 3(9), p.698 - 704, 1961/00

https://doi.org/10.3327/jaesj.3.698

no abstracts in English

Inorganic extraction studies on the system between bis(2-ethyl hexyl) orthophosphoric acid and hydrochloric acid, 1

Bulletin of the Chemical Society of Japan, 33(8), p.1038 - 1046, 1960/00

https://doi.org/10.1246/bcsj.33.1038

no abstracts in English