铀的三元协萃规律研究-HTTA-HPMBA-(C8H5)4AsCl三元协萃高氯酸铀酰的机理

本文研究α-噻吩甲酰三氟丙酮(HTTA),1-苯基-3-甲基-4-苯甲酰基-5吡唑啉酮(HPMBP)与四苯基砷氯(C5H5)4AsCl的氯仿溶液从高氯酸中萃取U(VI).该体系属螯合,离子缔合AAC类,测定了其二元及三元协同萃取体系平衡常数.用亚甲基蓝光度法测定了萃合物中ClO4^-的存在,用斜率法确定二元协萃物组成为(C6H5)4As^+UO2(ClO4)(TTA)2]^-和C6H5)4As^+UO2(ClO4)(PMBP)2]^-三元协萃配合物为(C6H5)4As^+UO2(ClO4)(TTA)(PMBP)]^-.

Synergistic extraction of uranyl perchlorate by the ternary system of AAC species composed of HTTA-HPMBP-(C6H504AsCl

A new ternary synergistic extracting system composed of 2 chelate extracting ligands and 1 ion association ligand (AAC species) was studied. The UO2(ClO4)2 was extracted by the binary system of thenoyltrifluoroacetone (HTTA) and of 1-phenyl-3-methyl-4-benzoylpyrazol-5-one (HPMBP) with Ph4AsCl in CHCl3. The binary synergistic equilibrium constants are log bA1C = 9931 HTTA + Ph4AsCl system] and log bA2C = 4.86 HPMBP + Ph4AsCl system], resp. The synergic effect occurred udring the extration of UO2(ClO4)2 by a CHCl3 solution of HTTA + HPMBP + Ph4AsCl. The principle of min. d. of elec. charge plays an important role in this system. The formation of a ternary extracted complex Ph4As]UO2ClO4(TTA)(PMBP) was confirmed by the methylene blue spectrophotometric method. The equilibrium constant is bA1A2C = 5.52.