“…The Higgins contactor, a well known continuous ion exchange contactor, was selected to be used in the analysis reported here. There are many literature references to use of the Higgins column on a wide variety of problems (Arehart et al, 1956;Cowles et al, 1956;Hancher et al, 1957;Higgins, 1952Higgins, , 1955Higgins, , 1956Higgins and Messing, 1958;Higgins and Roberts, 1954;Nachod and Schubert, 1956;Platt, 1960;Poole, 1959; Roberts, 1958. The Higgins system is a moving packed-bed column type of contactor.…”