Liquid continued resin beads

Moving-bed ion exchange. Ion-exchange resin particles are small spherical beads. These can be readily moved out of an ion-exchange column with up-flowing liquid and pumped with the liquid to another tank or column. Transport of resin is used in two types of uranium extraction processes, (1) the moving-bed type and (2) the continuous RIP type. 

Finally, we observe that waves and patterns may be obtained in an effectively open system if the reaction occurs in one medium (usually solid) that is immersed in another medium (usually liquid) that provides, via transport, a continuous supply of fresh reactants. Several attractive systems of this type have been developed. Maselko and Showalter studied the BZ reaction on the surface of beads of cation-exchange resin on which the ferroin catalyst had been immobilized (Maselko and Showalter, 1989 Maselko et al., 1989). When the beads were placed in a solution containing sulfuric add, bromate, and malonic acid, spiral waves formed. With small (100-1000 /ixm), closely packed beads, the wave moved from bead to bead. With larger, isolated beads, it was possible to observe the movement of a spiral wave on the surface of a single bead. 

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