Réactions des atomes d’iode 123 avec le benzène en phase liquide

Abstract

Réactions des atomes d'iode 123 avec le benzène en phase liquideFar R. MUXART, J. VERNOIS et H. Avec 1 figure. (Reçu le 24 janvier 1974) Résumé Les réactions des atomes d'iode 123 nucléogénétiques avec le benzène en phase liquide ont été étudiées. En absence d'intercepteur, le rendement organique total est d'environ 18-20% et le rendement de K3 IC e H 5 est de 7°/ 0 . En présence de I 2 , le rendement organique total varie de 15 à 11% entre 10 -e et 5 · 10 -3 fm de I 2 . Le rendement de m IC"H 5 est peu affecté par la présence d'iode. ZusammenfassungDie Reaktionen von bei Kernprozessen gebildeten 123 J-Atomen mit flüssigem Benzen sind untersucht worden. Falls kein Radikalfänger anwesend ist, beträgt die gesamte organische Ausbeute 18-20% und die Ausbeute an C e H 6 I 7%. In Anwesenheit von I 2 geht zwischen 10 -e und 5 · 10 3 mf Jod die organische Ausbeute von 15% auf 11% zurück. Die Ausbeute an C,H 5 I wird von I 2 wenig beeinflußt.

Protactinium

“…Extraction by tertiary amines in early work was explored only at levels of 10 -4 M or less, but this procedure shows promise because it permits the extraction of Pa(V) from HF-containing solutions (Moore, 1960;Muxart and Arapaki-Strapelias, 1963;Guillot, 1966;Muxart et al, 1966b;Pal'shin et al, 1971;Moore and Thern, 1974).…”

Separation of Thorium, Protactinium and Uranium by Ion Exchange and Extraction

“…This effect and the influence of A1C1 3 on the distribution coefficients of Pa in presence of fluoride ions had to be investigated in more detail. Several review articles on the chemistry of protactinium [21][22][23][24][25] and other papers [26][27][28][29][30][31][32][33][34][35][36][37] deal with the extraction behaviour of protactinium. But additional experiments had to be carried out in order to study the extraction behaviour of Th, Pa, U and fission products and the influence of fluoride ions under the same conditions.…”

“…Very good extractants are found among alkylesters of phosphoric acid, high molecular alcohols, ketones and amines. Extraction of Pa by ternary amines is studied in several [32][33][34][35], For sulfato complexes of Pa high distribution coefficients are found with primary amines [41 -43]. From H 2 S0 4 solutions Pa can also be extracted with bis<2-ethylhexyl)-phosphoric acid (D2EHPA) [44] or with N-benzoylphenylhydroxylamin [45], Most investigations on the extraction of Pa have been carried out in the tracer scale, but in some cases concentrations of the order of 1 -10 g/1 were used [30,31,43,[46][47][48].…”

“…From H 2 S0 4 solutions Pa can also be extracted with bis<2-ethylhexyl)-phosphoric acid (D2EHPA) [44] or with N-benzoylphenylhydroxylamin [45], Most investigations on the extraction of Pa have been carried out in the tracer scale, but in some cases concentrations of the order of 1 -10 g/1 were used [30,31,43,[46][47][48]. For extraction from HCl solutions tributyl phosphate (TBP), alcohols like diisobutylcarbinol [26], ketones like diisopropylketon [27], diisobutylketon (DIBK) [30,31 ] or methylisobutylketon (MIBK or Hexon) [27][28][29] and amines [32][33][34][35] may be used. DIBK was applied for separation of 100 g 231 Pa from the residues of uranium recovery [30,31 ], MIBK and TBP are used in technical scale for reprocessing of spent nuclear fuels.…”