Abstract
Numerical simulation was developed for improving of desalting efficiency of GDI (Graft De-Ionization). GDI included original-shaped ion exchangers which were synthesized by radiation-induced graft polymerization. Because general EDI (Electro De-Ionization) included mixed ion-exchange resin beads, it is difficult to pack ion-exchange resin beads optimally. GDI have a lot of potential to be improved with improved arrangements of original-shaped ion exchangers. To get better desalting efficiency of GDI, we have developed a new desalting model in which protons and hydroxide ions are generated in the interface of anion exchangers and cation exchangers. Depending on these calculations we study a new type of GDI in which the water dissociation reaction field was arranged into exclusive de ionization compartments. Simulations and experiments concluded that desalting efficiency became high in the new type of GDI(Dw-GDI). In experiments the sodium ion concentration in the de-ionized water in the new type GDI falls to 1/10 of ion concentration in conventional GDI.
