DISTRIBUTION BEHAVIOUR OF U(VI), Th(IV) AND Pa(V) FROM NITRIC ACID MEDIUM USING LINEAR AND BRANCHED CHAIN EXTRACTANTS
DISTRIBUTION BEHAVIOUR OF U(VI), Th(IV) AND Pa(V) FROM NITRIC ACID MEDIUM USING LINEAR AND BRANCHED CHAIN EXTRACTANTS
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DOI：
10.1080/07366290008934709
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发表时间：
2000-09
影响因子：
2
通讯作者：
P. Pathak;D. R. Prabhu;V. Manchanda
中科院分区：
文献类型：
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作者：
P. Pathak;D. R. Prabhu;V. Manchanda
本文研究了1 M磷酸三（2-乙基己基）酯（TEHP）、二（2-乙基己基）异丁酰胺（D2 EHIBA）、磷酸三正丁酯（TBP）和二（2-乙基己基）己酰胺（DHHA）的正十二烷溶液在含220 g/L钍的硝酸介质中对铀（VI）、钍（IV）和钯（V）的萃取行为。1 M TBP和1 M DHHA的钍的极限有机浓度（g/L）分别为31，20（1 M HNO 3）和25，13（4 M HNO 3）。测定了钍（220 g/L）存在时，铀（VI）、钍（IV）和钯（V）在铀溶液中的分配比（D）值。1 M HNO 3表明酰胺的烷基中的支化显著抑制萃取。鉴于在4 M HNO_3条件下，5%TBP在THOREX流程中选择性萃取U而非Th，本文还研究了以较低浓度（0.18M）萃取剂作对比时的分配行为。F.）在不同的实验条件下，U（VI）相对于Th（IV）的值一致地按以下顺序变化：D2 EHIBA> DHHA > TEHP > TBP。从含有233 U（10−5 M）的合成混合物中定量提取233 U。233 Pa（10−11 M）和钍（220 g/L）在1 M HNO 3下使用1 M D2 EHIBA在正十二烷中的溶液分三个阶段实现，还进行了D2 EHIBA的反萃取和可重复使用性研究。
ABSTRACT The extraction behaviour of 1M solutions of tri-2-ethylhexyl phosphate (TEHP), di-2-ethyl hexyl isobutyramide (D2EHIBA), tri-n-butyl phosphate (TBP) and di-n-hexyl hexanamide (DHHA) in n-dodecane towards U(VI), Th(IV) and Pa(V) in the presence of 220 g/L of Th from nitric acid medium has been studied. The limiting organic concentrations (LOC) of thorium (g/L) for 1 M TBP and 1 M DHHA are evaluated as 31, 20 ( at 1 M HNO3) and 25,13 (at 4 M HNO3) respectively. The distribution ratio (D) values of U(VI), Th(IV) and Pa(V) in the presence of thorium (220 g/L) at. 1 M HNO3 suggest that branching in the alky group of amides suppresses the extraction considerably. In view of the selective extraction of U over Th by 5 % TBP in THOREX process at 4 M HNO3, distribution behaviour is also studied employing a lower concenfration (0·18 M) of extractant for comparison purpose, Separation factor (S. F.) values for U(VI) over Th(IV) under different experimental conditions consistently varied in the order: D2EHIBA > DHHA > TEHP > TBP. The quantitative extraction of 233U from a synthetic mixture containing 233U (10−5 M). 233Pa (10−11 M) and thorium (220 g/L) at 1 M HNO3 using 1 M solution of D2EHIBA in n-dodecane is achieved in three stages, Stripping and reusability studies of D2EHIBA have also been carried out.