锕系、镧系元素分离中新萃取剂的研究(III)——新萃取剂HMBMPPT的合成及其对铀(VI)的萃取研究

Study on new extractants for actinides and lanthanides separation (III) ——studies on the synthesis of a new extractant HMBMPPT and its extraction for U(VI)

通过酰基化、氯化、硫化反应合成了新的酰代吡唑硫酮,即4-(4-甲氧基)-苯甲酰基-2,4-二氢-5-甲基-2-苯基-3H-吡唑硫酮-3(HMBMPPT)。产物的结构用红外、氢核磁共振谱、质谱、元素分析及X射线衍射进行了表征。研究了以氯仿为溶剂HMBMPPT 在硝酸介质中对铀(VI)的萃取行为,考察了稀释剂、萃取剂浓度、酸度、温度及盐析剂浓度对分配比的影响。同时,对萃取配合物的化学组成及萃取机理也进行了分析和讨论。

A novel extractant, 4-(4-methoxybenzoyl)-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-thione (HMBMPPT) was synthesized. Its composition and structure were confirmed by elemental analysis, mass spectrome-try, IR, 1H NMR and X-ray crystal analysis. The extraction of U(VI) with HMBMPPT in chloroform from nitric acid solution was studied including influences of diluents, the salting-out agent concentration, acidity in aqueous phase and extractant concentration in organic phase as well as temperature on the distribution ratio. The chemical composi-tion of extraction complex and the extraction mechanism were also discussed.