两种新型萃取剂的合成、表征及HCBMPPT对铀(Ⅵ)萃取机理的研究

STUDY ON THE SYNTHESES AND CHARACTERIZATIONS OF NEW EXTRACTANTS AND THE SOLVENT EXTRACTION MECHANISM TO U(Ⅵ) FROM NITRIC ACID MEDIA

合成了4 邻氯苯甲酰基 2,4 二氢 5 甲基 2 苯基 3H 吡唑硫酮 3(HCBMPPT)和4 邻氟苯甲酰基 2,4 二氢 5 甲基 2 苯基 3H 吡唑硫酮 3(HFBMPPT)两个新萃取剂,用波谱确定了结构。研究了HCBMPPT在硝酸介质中对铀(Ⅵ)的萃取行为,其萃取分配比随萃取剂浓度、pH值的升高而增大,同时对萃合物的化学组成及萃取机理进行了分析和讨论。

Two new extractants HCBMPPT ) and HFBMPPT (2fluorobenzoyl)2,4dihydro5methyl2phenyl3Hpyrazol3thione are synthesized from PMP (1phenyl3methypyrazolone). The structures of these two compounds are confirmed by means of elemental analysis, mass spectrometry, IR, 1H NMR and Xray crystal analysis. The solvent extraction of U(Ⅵ) from nitric acid solution by HCBMPPT in toluene is studied. The distribution ratio of U(Ⅵ) increases with the increasing pH of the aqueous phase. When the concentration of HCBMPPT increases, also the distribution ratio of U(Ⅵ) increases rapidly. Meanwhile, the chemical composition of extracted complex and the extraction mechanism of extraction reaction are discussed.