Extraction properties of diisoamyl methylphosphinite

Solvent Extraction of Inorganic Species.

“…Many more elements were found to extract from chloride solutions. From not too concentrated hydrochloric acid, uranium(VI) is extracted as U02C12 2TBP both by pure TBP (206) and by TBP diluted with carbon tetrachloride (365) or benzene (429). At high concentrations of uranium and chloride, and with kerosene as diluent, a third liquid phase is formed (365, 429).…”

“…At high concentrations of uranium and chloride, and with kerosene as diluent, a third liquid phase is formed (365, 429). At high hydrochloric acid concentrations, acid also extracts, either independently of the uranium (365) or as HU02C13 2TBP (429). This latter view is confirmed by spectrophotometric evidence of a new uranium species, which is also produced by dissolving gaseous hydrogen chloride or solid hydroxylamine hydrochloride in U02C12 TBP solutions.…”

“…Uranium(IV) is extracted above 4 M hydrochloric acid as UCh 2DAMP, and uranium(VI) is extracted as U02C12 2D AMP (362). From nitric acid, uranyl nitrate is extracted as U02(N03)2 2DAMP (364,383,386), and the salting out of this complex by various nitrates has been studied by Solovkin (386), as described above. The use of gel-liquid distribution, with TBP-swelled polystyrene, has been mentioned above (387,379).…”

“…Most of the studies with nitric acid dealt with the extraction of the actinides and of fission products. The tetravalent actinides are extracted as (R3NH)2M-(N03)6 where M is Th, U, Np and Pu (29,46,55,163,192,193,215,354,375,449), whereas hexavalent uranium is extracted as (R3NH)U02(N03)3 (29,163,192,193,215,361,421,428) as probably also are neptunium and plutonium (192,441). The spectra of the tetra-and hexavalent actinides in the organic phase have been published (192) and found to be similar to the solid compounds obtained with quaternary ammonium salts.…”

Novel and Effective Separation Technology for Crystal Waste Solutions of Zirconium Oxychloride Using N235 and P350

“…Pyartman and Kopyrin [16] reported on the extraction mechanism of Th(IV) from nitric acid with tri-n-butyl phosphate also. Shevchenko et al [17] reported on the extraction mechanism of U(VI) from nitric acid solutions using diisoamyl methylphosphinate. On the basis of those reports, the extraction mechanism of Th(IV) and U(VI) from a mixture of nitric acid and hydrochloric acid using P350 (L) can be shown as follows:…”