Abstract
N,N,N`,N`-tetraalkyl -2 alkyl propane -1,3 diamides (RR`NCO){sub 2}CHR`` are investigated in the aim to separate actinides from nuclear wastes. N,N`-dimethyl N,N`-dibutyl tetradecylmalonamide (DMDBTDMA) was selected. This molecule can extract trivalent actinides in aliphatic diluents. Americium extraction is faster than iron extraction, hydrolytic degradation and solubility in aqueous phase are satisfactory. In non acidic media, diamides form aggregates, the size of which is function of diluent and diamide concentration. Extraction equilibria of HNO{sub 3}, UO{sub 2}{sup 2+}, Pu{sup 4+}, Am{sup 3+} and Fe{sup 3+} are investigated.Four complexes are formed with nitric acid: L{sub 2}HNO{sub 3}, LHNO{sub 3}, L{sub 2}(HNO{sub 3}){sub 2} and L(HNO{sub 3}){sub 3} with L=DMDBTDMA. UO{sub 2}{sup 2+} and Pu{sup 4+} extraction takes place via the formation of neutral complexes: LUO{sub 2}(NO{sub 3}){sub 2}, LPu(NO{sub 3}){sub 4} and L{sub 2}Pu(NO{sub 3}){sub 4} for any nitric acid concentration. Am{sup 3+} extraction takes place via the formation of LAm(NO{sub 3}){sub 3} and L{sub 2}Am(NO{sub 3}){sub 3} for low nitric acid concentration and L{sub x}H{sub y}Am(NO{sub 3}){sub 3+y} at higher acidity. Fe{sup 3+} extraction involves anionic complexes L{sub x}HFe(NO{sub 3}){sub 4} for any acid concentration. In the presence of metallic cations, two kinds of interactions are observed: in the inner sphere of
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Citation Formats
Nigond, L.
Extracting properties of N,N,N`N`-tetraalkyl-2 alkyl propane -1,3 diamides; Proprietes extractantes des N,N,N`,N`-tetraalkyl-alkyl-2 propanediamides 1,3.
France: N. p.,
1992.
Web.
Nigond, L.
Extracting properties of N,N,N`N`-tetraalkyl-2 alkyl propane -1,3 diamides; Proprietes extractantes des N,N,N`,N`-tetraalkyl-alkyl-2 propanediamides 1,3.
France.
Nigond, L.
1992.
"Extracting properties of N,N,N`N`-tetraalkyl-2 alkyl propane -1,3 diamides; Proprietes extractantes des N,N,N`,N`-tetraalkyl-alkyl-2 propanediamides 1,3."
France.
@misc{etde_10128113,
title = {Extracting properties of N,N,N`N`-tetraalkyl-2 alkyl propane -1,3 diamides; Proprietes extractantes des N,N,N`,N`-tetraalkyl-alkyl-2 propanediamides 1,3}
author = {Nigond, L}
abstractNote = {N,N,N`,N`-tetraalkyl -2 alkyl propane -1,3 diamides (RR`NCO){sub 2}CHR`` are investigated in the aim to separate actinides from nuclear wastes. N,N`-dimethyl N,N`-dibutyl tetradecylmalonamide (DMDBTDMA) was selected. This molecule can extract trivalent actinides in aliphatic diluents. Americium extraction is faster than iron extraction, hydrolytic degradation and solubility in aqueous phase are satisfactory. In non acidic media, diamides form aggregates, the size of which is function of diluent and diamide concentration. Extraction equilibria of HNO{sub 3}, UO{sub 2}{sup 2+}, Pu{sup 4+}, Am{sup 3+} and Fe{sup 3+} are investigated.Four complexes are formed with nitric acid: L{sub 2}HNO{sub 3}, LHNO{sub 3}, L{sub 2}(HNO{sub 3}){sub 2} and L(HNO{sub 3}){sub 3} with L=DMDBTDMA. UO{sub 2}{sup 2+} and Pu{sup 4+} extraction takes place via the formation of neutral complexes: LUO{sub 2}(NO{sub 3}){sub 2}, LPu(NO{sub 3}){sub 4} and L{sub 2}Pu(NO{sub 3}){sub 4} for any nitric acid concentration. Am{sup 3+} extraction takes place via the formation of LAm(NO{sub 3}){sub 3} and L{sub 2}Am(NO{sub 3}){sub 3} for low nitric acid concentration and L{sub x}H{sub y}Am(NO{sub 3}){sub 3+y} at higher acidity. Fe{sup 3+} extraction involves anionic complexes L{sub x}HFe(NO{sub 3}){sub 4} for any acid concentration. In the presence of metallic cations, two kinds of interactions are observed: in the inner sphere of the metal diamide-metal ion complexation and in the outer sphere diamide-metallic complex interaction. The malonamide DMDBTDMA can be used to separate (III), (IV) and (VI) actinides from radioactive wastes.}
place = {France}
year = {1992}
month = {Jan}
}
title = {Extracting properties of N,N,N`N`-tetraalkyl-2 alkyl propane -1,3 diamides; Proprietes extractantes des N,N,N`,N`-tetraalkyl-alkyl-2 propanediamides 1,3}
author = {Nigond, L}
abstractNote = {N,N,N`,N`-tetraalkyl -2 alkyl propane -1,3 diamides (RR`NCO){sub 2}CHR`` are investigated in the aim to separate actinides from nuclear wastes. N,N`-dimethyl N,N`-dibutyl tetradecylmalonamide (DMDBTDMA) was selected. This molecule can extract trivalent actinides in aliphatic diluents. Americium extraction is faster than iron extraction, hydrolytic degradation and solubility in aqueous phase are satisfactory. In non acidic media, diamides form aggregates, the size of which is function of diluent and diamide concentration. Extraction equilibria of HNO{sub 3}, UO{sub 2}{sup 2+}, Pu{sup 4+}, Am{sup 3+} and Fe{sup 3+} are investigated.Four complexes are formed with nitric acid: L{sub 2}HNO{sub 3}, LHNO{sub 3}, L{sub 2}(HNO{sub 3}){sub 2} and L(HNO{sub 3}){sub 3} with L=DMDBTDMA. UO{sub 2}{sup 2+} and Pu{sup 4+} extraction takes place via the formation of neutral complexes: LUO{sub 2}(NO{sub 3}){sub 2}, LPu(NO{sub 3}){sub 4} and L{sub 2}Pu(NO{sub 3}){sub 4} for any nitric acid concentration. Am{sup 3+} extraction takes place via the formation of LAm(NO{sub 3}){sub 3} and L{sub 2}Am(NO{sub 3}){sub 3} for low nitric acid concentration and L{sub x}H{sub y}Am(NO{sub 3}){sub 3+y} at higher acidity. Fe{sup 3+} extraction involves anionic complexes L{sub x}HFe(NO{sub 3}){sub 4} for any acid concentration. In the presence of metallic cations, two kinds of interactions are observed: in the inner sphere of the metal diamide-metal ion complexation and in the outer sphere diamide-metallic complex interaction. The malonamide DMDBTDMA can be used to separate (III), (IV) and (VI) actinides from radioactive wastes.}
place = {France}
year = {1992}
month = {Jan}
}