二-(2-乙基己基)膦酸(P_(229))萃取Tb,Tm

EXTRACTION OF Tb AND Tm BY EXTRACTANT P_(229)

研究了P_(229)萃取剂从盐酸及硝酸溶液中的萃取。结果表明,P_(229)萃取Tb^(3+),Tm^(3+)的分配比D在硝酸介质中比在盐酸介质中大。获得在15—55℃下P_(229)萃取Tb^(3+),Tm^(3+)的热效应数据及温度函数。数据表明,由于ΔH>0,ΔS<0,反应主要依体系焓变促成。计算了萃取络合物的热分解反应动力学参数表观活化能E及反应级数。可信度>95％。

The distribution ratio of extraction of Tb^(3+) and Tm^(3+) with extrac- tant P_(229) from the solution of HNO_3 is greater than that from HCl. The thermal ef- fect data of extraction under 15--55℃ show △H>0 and △S<0, and enthalpy va- riation makes the reaction in progress. The properties and behaviour of thermal decomposition of Tb(HA_2)_3 and Tm(HA_2)_3 solid complexes were studied by using Freeman and Carroll's calculation method. The kinetic parameter of the thermal de- composition reaction of Tb(HA_2)_3 and Tm(HA_2)_3 extraction complexes was calcula- ted and the data reliability is more than 95%.