TY - GEN

T1 - Diamide derivatives of dipicolinic acid as actinide and lanthanide extractants in a variation of the UNEX process

AU - Peterman, D. R.

AU - Herbst, R. S.

AU - Law, J. D.

AU - Tillotson, R. D.

AU - Garn, T. G.

AU - Todd, T. A.

AU - Romanovskiy, V. N.

AU - Babain, V. A.

AU - Alyapyshev, M. Yu

AU - Smirnov, I. V.

PY - 2007/12/1

Y1 - 2007/12/1

N2 - The Universal Extraction (UNEX) process has been developed for simultaneous extraction of cesium, strontium, and actinides from acidic solutions. This process utilizes an extradant consisting of 0.08 M chlorinated cobalt dicarbollide (HCCD), 0.007-0.02 M polyethylene glycol (PEG-400), and 0.02 M diphenyl-N,N-di-n-butylcarbamoylmethylphosphine oxide (PhiCMPO) in the diluent trifluoromethylphenyl sulfone (CF3C6H5SO 2, designated FS-13) and provides simultaneous extraction of Cs, Sr, actinides, and lanthanides from HNO3 solutions. The UNEXprocess is of limited utility for processing acidic solutions containing large quantities of lanthanides and/or actinides, such as dissolved spent nuclear fuel solutions. These constraints are primarily attributed to the limited concentrations of CMPO (a maximum of ∼0.02 M) in the organic phase and limited solubility of the CMPO-metal complexes. As a result, alternative actinide and lanthanide extradants are being investigated for use with HCCD as an improvement for waste processing and for applications where higher concentrations of the metals are present. Our preliminary results indicate that diamide derivatives of dipicolinic acid may function as efficient actinide and lanthanide extradants. The results to be presented indicate that, of the numerous diamides studied to date, the tetrabutyldiamide of dipicolinic acid, TBDPA, shows the most promise as an alternative adinide/lanthanide extradant in the UNEX process.

AB - The Universal Extraction (UNEX) process has been developed for simultaneous extraction of cesium, strontium, and actinides from acidic solutions. This process utilizes an extradant consisting of 0.08 M chlorinated cobalt dicarbollide (HCCD), 0.007-0.02 M polyethylene glycol (PEG-400), and 0.02 M diphenyl-N,N-di-n-butylcarbamoylmethylphosphine oxide (PhiCMPO) in the diluent trifluoromethylphenyl sulfone (CF3C6H5SO 2, designated FS-13) and provides simultaneous extraction of Cs, Sr, actinides, and lanthanides from HNO3 solutions. The UNEXprocess is of limited utility for processing acidic solutions containing large quantities of lanthanides and/or actinides, such as dissolved spent nuclear fuel solutions. These constraints are primarily attributed to the limited concentrations of CMPO (a maximum of ∼0.02 M) in the organic phase and limited solubility of the CMPO-metal complexes. As a result, alternative actinide and lanthanide extradants are being investigated for use with HCCD as an improvement for waste processing and for applications where higher concentrations of the metals are present. Our preliminary results indicate that diamide derivatives of dipicolinic acid may function as efficient actinide and lanthanide extradants. The results to be presented indicate that, of the numerous diamides studied to date, the tetrabutyldiamide of dipicolinic acid, TBDPA, shows the most promise as an alternative adinide/lanthanide extradant in the UNEX process.

UR - http://www.scopus.com/inward/record.url?scp=45149116041&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:45149116041

SN - 0894480553

SN - 9780894480553

T3 - GLOBAL 2007: Advanced Nuclear Fuel Cycles and Systems

SP - 1106

EP - 1110

BT - GLOBAL 2007

T2 - GLOBAL 2007: Advanced Nuclear Fuel Cycles and Systems

Y2 - 9 September 2007 through 13 September 2007

ER -