Effect of diluents on the extraction of Sr2+ from HNO3 solutions with dicyclohexano-18-crown-6
Effect of diluents on the extraction of Sr2+ from HNO3 solutions with dicyclohexano-18-crown-6
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DOI：
10.1081/sei-120017547
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发表时间：
2003-01-01
影响因子：
2
通讯作者：
Mathur, JN
中科院分区：
文献类型：
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作者：
Gupta, KK;Achuthan, PV;Mathur, JN
用二环己基-18-冠-6（DC_（18）C_6）在不同硝酸浓度的苯溶液中萃取Sr ~（2+），并确定了萃取物的性质。考虑到Sr ~（2+）与NO_3 ~-和水溶性DC ~（18）C_6的水溶液络合以及DC ~（18）C_6在有机相中对HNO_3的吸收，计算了Sr（NO_3）_2·DC ~（18）C_6生成的平衡常数。研究了苯以外的稀释剂如氯苯、二氯乙烷、氯仿、正辛醇、四氯化碳和硝基苯以及苯和硝基苯的混合物对DC 18 C6萃取Sr ~（2+）的影响。在实践方面，Sr 2+的萃取已被检查与DC 18 C6在磷酸三丁酯（TBP），十二烷，和I-辛醇的溶剂混合物。该溶剂混合物至少部分地避免了当单独使用1-辛醇从贫含少量锕系元素的TRUEX工艺萃余液中分离和回收Sr 2+时所设想的缺点。
Extraction of Sr2+ has been carried out with dicyclohexano-18-crown-6 (DC18C6) in benzene from varying HNO3 concentrations, and the nature of species extracted has been established. The equilibrium constant values for the formation of Sr(NO3)(2).DC18C6 have been evaluated, taking into account the aqueous complexing of Sr2+ with NO3- and with aqueous-soluble DC18C6, and also the uptake of HNO3 by DC18C6 in the organic phase. Effect of diluents apart from benzene, such as chlorobenzene, dichloroethane, chloroform, I-octanol, carbon-tetrachloride, and nitrobenzene, and various mixtures of benzene and nitrobenzene on the extraction of Sr2+ with DC18C6 has also been studied. On the practical side, the extraction of Sr2+ has been examined with DC18C6 in solvent mixtures of tri-n-butyl phosphate (TBP), dodecane, and I-octanol. This solvent mixture, at least partially, avoids the disadvantages envisaged while using 1-octanol alone for the separation and recovery of Sr2+ from minor actinide depleted TRUEX process raffinate.