1,10-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)癸二酮-1,10萃取钍的研究
A STUDY OF THE EXTRACTION OF THORIUM (IV) WITH 1, 10-BIS (1' -PHENYL-3'-METHYL-5'- OXOPYRAZOLE-4'-YL) DECANEDIONE-1, 10
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摘要: <正> 1,10-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)癸二酮-1,10(以下简称H_2A)是最近合成的一种β-双酮螯合剂,它比HPMBP多一倍螯合功能团,在适当的条件下能与钍(Ⅳ)生成比较稳定的螯合物,并能被氯仿萃取。为此,我们研究了H_2A与钍(Ⅳ)的萃取行为,也试验了Th(Ⅳ)与U(Ⅵ),La(Ⅲ),Ce(Ⅲ),Pr(Ⅲ),Nd(Ⅲ),Sm(Ⅲ),Eu(Ⅲ),Tb(Ⅲ),Er(Ⅲ)和Yb(Ⅲ)萃取分离的可能性。Abstract: The complexation and the extraction behaviour of 1,10-bis(1'-phenyl-3'-methyl -5'-oxopyrazole-4'-yl) decanedione-1 ,10 (H2A) with thorium (IV) in nitric acid are studied . Experimental results show that the composition of the extracted compound is ThA2 and the extraction equilibrium constant is 3.8×104. Thorium may be extracted quantitatively from U(VI) and rare earths in 0.3 mol/l nitric acid(Keeping the ionic strength fixed at 2.3 mol/l with the required quantity of sodium nitrate) with a H2A solution in chloroform. Thorium is back-extracted quantitatively with 3.5 mol/l HCl when phase ratio is 1:1. Other properties of the extracted compound are also examined with UV, IR, 1 HNMR and DTA-TG.
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