The employment of supercritical fluid extraction (SFE) within the nuclear industry may reduce the environmental burden by reduction in solvent waste generation. In this perspective, a SFE based method was developed for selective extraction of uranium from U-Zr and U-Th solutions using tris-(2-methylbutyl) phosphate (T2MBP) as a ligand in supercritical carbon dioxide (SCCO₂). Prior to SFE studies, the utilisation of T2MBP in SCCO₂ was examined by carrying out solubility measurements using dynamic flow technique at (313−333) K and (10−20) MPa. T2MBP has sufficient solubility in SCCO₂ and ranges from 2.55 × 10^-2 mol·mol^-1 to 8.95 × 10^-2 mol·mol^-1. The solubility increases with pressure and decreases with temperature, resulting in retrograde solubility behaviour. The experimental solubility data was successfully correlated using different density based semi-empirical equations. Based on the solubility data, selective recovery of uranium from U-Zr and U-Th solutions was demonstrated using SCCO₂+T2MBP.

在核工业中采用超临界流体萃取 (SFE) 可以通过减少溶剂废物的产生来减轻环境负担。_{从这个角度来看，开发了一种基于 SFE 的方法，用于在超临界二氧化碳 (SCCO 2} ) 中使用三（2-甲基丁基）磷酸盐 (T2MBP) 作为配体从 U-Zr 和 U-Th 溶液中选择性提取铀。在 SFE 研究之前，通过在 (313–333) K 和 (10–20) MPa 下使用动态流动技术进行溶解度测量，检查了T2MBP 在 SCCO ₂中的利用。T2MBP在SCCO ₂中具有足够的溶解度，范围为2.55×10 ^-2 mol·mol ^-1至8.95×10 ^-2 mol·mol ^-1. 溶解度随压力增加而随温度降低，导致逆行溶解度行为。使用基于不同密度的半经验方程成功地关联了实验溶解度数据。基于溶解度数据，使用 SCCO ₂ +T2MBP 证明了从 U-Zr 和 U-Th 溶液中选择性回收铀。