Extraction of transplutonium elements with diphenyl (alkyl)dialkyl-carbamoylmethyl phosphine oxides

Study of Solvent Extraction of Lanthanide(III) with Tetra(p-)tolylmethylene Diphosphine Dioxide (TTMDPDO) from a Nitric Acid Solution

“…Actinide extraction has been extensively studied in the U.S. and Russia [1][2][3][4][5][6][7][8], especially those of the transplutonium elements with bidentate organophosphorus compounds. After having studied the extraction of Am and other elements with a great number of carbamoylphosphonates (CMP) and carbamoylphosphine oxides (CMPO), Horwitz and Schulz recommended, for practical purposes, an octylphenylcarbamoyl-phosphine oxide and a TRUEX flowsheet [9][10][11], that uses this extractant modified with TBP as a solubilizing and synergistic agent.…”

Methods of separation of actinide elements based on complex formation in extraction and sorption systems

“…It was found that solution of diphenyldibutylcarbamoylmethylphosphine oxide (Ph 2 Bu 2 ) in meta-nitrobenzofluoride is the most effective extractant of a type of bidentate neutral organophosphorus reagents, and it is used in the technology of isolation of actinides and lanthanides from strongly acidic solutions [1][2][3]. The study of properties of Ph 2 Bu 2 (a powdery solid) has shown that on contact with acid solutions it turns into a water-immiscible liquid.…”

Americium

“…One or two contactor stages for washing the stripped TRUEX process solvent with a dilute sodium carbonate solution are typically included to remove solvent degradation products and any traces of metal ions. Investigators in several countries have conducted continuous countercurrent demonstrations of variations of the TRUEX process with actual radioactive waste solutions of interest to them: references cited in the following list should be consulted for further details: For various reasons, including the prolonged Cold War syndrome, Russian scientists, largely independent of Western world progress, conducted extensive studies of the actinide extraction properties of multifunctional organophosphorus reagents (Myasoedov et al, , 1986Chmutova et al, 1983Chmutova et al, , 1989Myasoedov and Lebedev, 1991). A recent review paper by Myasoedov (1994) is of special interest.…”

“…8.7) with the number of bound donor atoms of the ligand. [1] (Moskvin, , 1971(Moskvin, , 1973; [2] (Choppin, 1965(Choppin, , 1970(Choppin, , 1975 (Keller et al, 1965a(Keller et al, , 1966; [26] (Bayat, 1970); [27] (Baybarz, 1965); [28] (Lebedev and Shalinets, 1968;Lebedev et al, 1968 ; [43] (Elesin and Zaitsev, 1971b);…”