抄録
Ion exchange non-woven fabrics (IEN) and ion conductive spacers (ICS) have been manufactured by means of radiation-induced graft polymerization (RIGP) in Ebara Corporation. These products are used for industrial water processing by semiconductor makers and others. The manufacturing process and characteristics of these products are described. The deionization performances for sodium chloride solution (10ppm) were compared by using a glass column of anion exchange nonwoven fabrics (A-IEN) and bead anion exchange resin (Dowex550A). A-IEN shows 2.5 times higher deionization efficiency than Dowex550A at the same bed depth. Effective surface area for deionization was estimated from the results of deionization efficiency. Effective surface area of A-IEN was calculated at 19m2/L, which is 3 times larger than Dowex550A. These results suggest that effective surface area per unit volume is more important than ion exchange capacity for deionization performance in the case of dilute aqueous solution. Thus, it has been proven that IEN has higher deionization performance than commercially available ion exchange resins.
