A cascade formed of a plurality of centrifugal contactors useful for countercurrent solvent extraction processes such as utilizable for the reprocessing of nuclear reactor fuels is modified to permit operation in the event one or both end stages of the cascade become inoperative. Weir assemblies are...http://www.google.com.au/patents/US4925441?utm_source=gb-gplus-sharePatent US4925441 - Centrifugal contactor modified for end stage operation in a multistage system
