含络合剂的超临界CO_2萃取固体硝酸盐避免了大量硝酸水溶液的使用,与传统的溶剂萃取相比,该方法具有减少废液的优点。多组分金属硝酸盐共存时的络合行为对于组分之间的分离十分重要。本研究建立了具有紫外可见光谱在线监测功能的超临界CO_2络合反应实验装置。利用该装置测定了3种镧系元素与TBP形成的络合物在超临界CO_2中的摩尔吸光系数,并研究了温度和压力对镧系硝酸盐络合行为的影响(图1)。结果 The supercritical CO2-containing solid nitrate with complexing agent can avoid the use of a large amount of nitric acid aqueous solution, which has the advantages of reducing the waste liquid compared with the traditional solvent extraction. The complexation behavior of multicomponent metal nitrates is important for the separation between the components. In this study, a supercritical CO_2 complexation experiment apparatus with on-line monitoring of UV-visible spectrum was established. The molar absorptivity of three complexes of lanthanides with TBP in supercritical CO 2 was measured by this device. The effects of temperature and pressure on the complexation of lanthanide nitrate were also studied (Fig. 1). result