Research efforts in the extraction of actinides using new tetradentate ligands. Final report, June 1, 1991--April 15, 1992
- Tennessee Technological Univ., Cookeville, TN (United States). Dept. of Chemistry
The synergistic extraction of two light actinides, thorium and uranium, with mixtures of 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one, HBNPP, 4-hexanoyl-3-methyl-1-phenyl-2-pyrazolin-5-one, P, and 4,4{prime}-nonanedioyl-bis(3-methyl-1-phenyl-2-pyrazolin-5-one), H{sub 2}NDBP with the tri-n-octyl phosphine oxide (TOPO) has been studied. The distribution of these ions between HN0{sub 3}/NaNO{sub 3} at an ionic strength of 1.0 M and the organic phase has been detected. Studies show, with the ligands alone, H{sub 2}NDBP is much more effective than either HBNPP or BHNPP. The slope-analysis treatments indicate formations ofTh(NDBP){sub 2}, Th(BNPP){sub 4}, and Th(EWP){sub 4} for Th{sup +4}, and U0{sub 2}(NDBP), U0{sub 2}(BMPP){sub 2}, and U0{sub 2}(HMPP){sub 2} for U0{sub 2}{sup +2} in the organic phase. With the addition of TOPOas a neutral donor, Th{sup +4} shows a high extraction ability with the mixtures of chelate ligands and TOPO, and the order of the extraction power is H{sub 2}NDBP > HHNPP {approx} HBNPP within the range studied. Whereas, U0{sub 2}{sup +2} shows significant increase in the extraction distribution and the extraction power follows the same order. Results show that in the TOPO systems, separation factors were much less than in the pyrazolone systems without TOPO.
- Research Organization:
- Los Alamos National Lab., NM (United States); Tennessee Technological Univ., Cookeville, TN (United States). Dept. of Chemistry
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10136659
- Report Number(s):
- LA-SUB-93-142; ON: DE93009787
- Resource Relation:
- Other Information: PBD: 1992
- Country of Publication:
- United States
- Language:
- English
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