酰代呲唑酮作为金属元素萃取剂的研究(Ⅱ)——不同基团取代的呲唑酮对于铈(Ⅲ)的萃取及其与二辛基亚砜的协同萃取作用

STUDIES ON SYNERGISTIC EXTRACTION SYSTEMS INVOLVING ACYLPYRAZOLONES——Ⅱ——EXTRACTION OF CERIUM (Ⅲ) BY ACYLPYRAZOLONES WITH VARIOUS SUBSTITUTING GROUPS AND THE SYNERGISM WITH DIOCTYLSULFOXIDE

本文研究了不同基团取代的酰代吡唑酮对铈(Ⅲ)的萃取。采用斜率法和同位素示踪技术,测得它们在HCl和HNO_(3)体系中的萃合物组成和萃取平衡常数;还研究了它们与二辛基亚砜对铈(Ⅲ)的协同萃取。研究过程中,以HTTA作为对照。

Five different acylpyrazolones, with various substituing groups, were used to study the extractibility of Ce(Ⅲ) at pH 3.1 into chloroform. The extractive ability decreases in the following order: (HTTA was also included for comparison).1-Phenyl, 3-methyl, 4-trifluoroacetyl pyrazolone(5) (HAPZ-8113F)>1-phenyl-3-phenyl, 4-benzoyl pyrazolone(5) (HAPZ-888)>1-phenyl, 3-methyl, 4-benzoyl pyrazolone(5) (HAPZ-818)>1-phenyl, 3-methyl, 4-acetyl pyrazolone(5) (HAPZ-811)>2-thenoyl trifluoroacetone(HTTA)>l-phenyl, 3-methyl, 4-formyl pyrazolone(5) (HAPZ-810)The reasons for introducing the above symbols in the above parentheses to represent the various extractants are explained.From the slope method, although HTTA in HCl gave the extracted species as CeA_(3), various acyl pyrazolones gave CeA_(2)·Cl·HA in the same experimental conditions. In HNO_(3) system, HAPZ-8113F gave CeA_(3) however.The logarithms of the extraction equilibrium constants calculated from the experimental data are: HAPZ-8113F/C1-0.08, HAPZ-818/Cl -0.82, HAPZ-811/C1- -2.57, HTTA/Cl- -9.05, HAPZ-8113F/NO_(3)^(-)-4.05. The extraction with HAPZ-810 is very slight.The synergistic effect, when dioctylsulfoxide DOSO was used in conjunction with various acylpyrazolones, was also studied. The effectiveness of synergism, when expressed as the ratio, Dmax(HA + S): DHA, was in the order,HAPZ-8113F>HTTA>HAPZ-888>HAPZ-818.Radioactive 144Ce as fracer added to natural cerium, was used throughout the experiment.