Solutions of N,N,N’,N’,N”,N”-hexa-n-hexylnitrilotriacetamide (HHNTA) in 20 % isodecanol-80 % n-dodecane (v/v) were employed for the supported liquid membrane (SLM) transport of U(VI), Np(IV), and Pu(IV) from nitric acid feed solutions using PTFE (polytetrafluoroethylene) flat sheet membranes. Preliminary transport studies revealed poor transport of U(VI) when compared with that of the tetravalent ions Np(IV) and Pu(IV) which may find application for their separation from acidic radioactive feeds. In view of this, all subsequent studies were carried out using Np(IV) and Pu(IV). The SLM studies performed with 0.08 M HHNTA as the carrier extractant indicated increased transport of the tetravalent actinide ions with increasing nitric acid and carrier extractant concentrations, while using 0.5 M HNO₃ + 0.5 M oxalic acid as the strip (or receiver) phase composition. However, while > 80 % transport of Np(IV) and Pu(IV) was obtained for a feed phase of 3 M HNO₃, a sharp decrease in the transport rate was seen at a feed acidity of 6 M HNO₃ probably due to anionic hexanitrato complex formation of the metal ions and also because of lower availability of the free ligand in the membrane phase at higher nitric acid concentrations. The membrane stability was poor suggesting the need for continuous replenishment for long term use.

解N，N，N 'N'，N”，N” -hexa- ñ在20％异癸醇，80％-hexylnitrilotriacetamide（HHNTA）ñ十二烷（v / v）用于使用PTFE（聚四氟乙烯）平板膜从硝酸进料溶液中进行U（VI），Np（IV）和Pu（IV）的支撑液膜（SLM）传输。初步的运输研究表明，与四价离子Np（IV）和Pu（IV）相比，U（VI）的运输较差，而四价离子Np（IV）和Pu（IV）可以从酸性放射性原料中分离出来。有鉴于此，所有后续研究均使用Np（IV）和Pu（IV）进行。使用0.08 M HHNTA作为载流子萃取剂进行的SLM研究表明，随着硝酸和载流子萃取剂浓度的增加，四价act系离子的运输增加，而使用0.5 M HNO ₃+ 0.5 M草酸作为汽提（或接受液）相组成。但是，尽管进料阶段3 M HNO ₃的Np（IV）和Pu（IV）的传输率> 80％，但进料酸度为6 M HNO _3时，传输速率急剧下降，这可能是由于阴离子六金属络合物形成的金属离子，也由于游离的配体在较高硝酸浓度下在膜相中的利用率较低。膜的稳定性很差，表明需要长期补充才能长期使用。