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本文研究了盐酸介质中多种不同结构冠醚对四价铀的萃取并求得分配比值。结果表明在以1,2-二氯乙烷为溶剂时二坏己基系列冠醚萃取铀(IV)最奸,且当水相酸度为8.0—8.5 M时分配比最大,其萃取能力依次为DCH-27-C-9>DCH-24-C-8>DCH-18-C-6>>DCH-30-C-10>DCH-21-C-7。用斜率法及等摩尔系列法证明,铀(IV)与五种二环己基冠醚萃合物的组成皆为1:2。本文还对萃取机理作了初步探讨。
In this paper, a variety of different structures of crown ether in hydrochloric acid medium extraction of tetravalent uranium and obtain the distribution ratio. The results showed that when the solvent was used 1,2-dichloroethane as solvent, di-n-hexyl crown ether was the strongest to extract uranium (IV), and the partition ratio was the highest when the aqueous acidity was 8.0-8.5 M, and the extraction ability was DCH -27-C-9> DCH-24-C-8> DCH-18-C-6 >> DCH-30-C-10> DCH-21-C-7. Using slope method and equimolar series method, the composition of uranium (IV) and five dicyclohexyl crown ethers are all 1: 2. This article also made a preliminary study on the extraction mechanism.