Influence of Diisopropyl Acid Phosphate (DiAP) on the Extraction Performance of TiAP: A Study on the Impact of DiAP Content and γ-Irradiation

Due to the complexity of organic phase components in the irradiated TiAP-dodecane solution, especially the uncertainty in sample component content, it becomes extremely challenging to investigate the impact of radiolytic products on the extraction performance of TiAP. However, research has revealed that DiAP (diisopropyl acid phosphate) is the main degradation product of TiAP under γ-irradiation and acid-catalyzed hydrolysis. Moreover, the use of trichlorophosphine and isobutanol in the synthesis of TiAP unavoidably generates DiAP. Additionally, similar to DBP (dibutyl phosphate), DiAP, as an acidic phosphorus compound, also affects the extraction and separation of actinides by TiAP. In conclusion, the study of the influence of DiAP on the extraction performance of TiAP is highly valuable. Therefore, in order to facilitate the investigation of DiAP's effects, this work synthesized DiAP and added it as an impurity to TiAP through external means, studying the impact of DiAP content on the extraction of fissile products such as U(VI), Th(IV), and Zr(IV) from 36% TiAP-dodecane solution in HNO3. Additionally, the influence of γ-irradiation on the extraction performance of TiAP-DiAP-n-DD was examined. It is hoped that this work will provide reference for controlling the DiAP content in TiAP.