二（2，4，4－三甲基戊基）膦酸从盐酸介质中萃取钍（Ⅳ）的机理

Extraction Mechanism of Th(Ⅳ)with Bis (2,4,4- Trimethylpentyl)phosphinic Acid from Hydrochloric Acid Medium

研究了二（２，４，４－三甲基戊基）膦酸（ＢＴＭＰＰＡ，ＨＡ）的正辛烷溶液从盐酸介质中萃取钍（Ⅳ）的机理。在未控制离子强度下，萃取平衡反应为：，在控制离子强度为１．０ｍｏｌ／Ｌ时，萃取反应为用饱和法确定的萃合物组成为ＴｈＣＩＡ＿３．计算了萃取反应的平衡常数及热力学函数。研究了饱和萃合物的ＩＲ和ＮＭＲ谱。

The extraction mechanism of Th(Ⅳ)with bis(2,4,4-trimethylpentyl)phosphinicacid(HA)in,n-octane from HCl medium with different ionic strength is studied,When theionic strength of the aqueous phase is not controlled,the extraction equilibrium is And when the ionic strength is 1.0mol/L, the extraction equilibrium isThe composition of the extracted complex determined by the saturation method is ThClA3.The effect of temperature on the extraction of Th(Ⅳ)indicates that it is an endothermal re-action. The stability constants and thermal mechanical functions of the extraction reactionare calculated.The IR and NMR spectra of the saturated complex are studied.