All of the flowsheets developed for the UREX+ demonstrations, conducted at Argonne National Laboratory, were designed to be operated using 2 cm countercurrent centrifugal contactors as the separation equipment. The flow rates were adjusted to the equipment design maximum. To ease the demonstration the solvent was not recycled, with the exception of the CCD-PEG and FPEX process tests where the supply of solvent was limited. In an actual plant application, a solvent wash section would be added to

each process module, before recycling the solvent to the front end of the process module.