| 摘要 |
PROBLEM TO BE SOLVED: To fill a desalting column with an upper side ion exchange resin while forming a lower side ion exchange resin in a desired form to certainly form a target ion exchange resin layer having a two-layered form in the column. SOLUTION: Two upper and lower ion exchange resin layers different from each other, which comprise an upper ion exchange resin layer comprising a mixed resin A of a cation exchange resin and an anion exchange resin and a lower ion exchange resin bed comprising the anion exchange resin alone or a mixed resin B having an anion exchange resin ratio higher than that of the mixed resin A, are formed in the desalting column. The desalting column is filled with the lower side ion exchange resin along with transfer water to form the lower ion exchange resin layer and, after the desalting column is replenished with transfer water and the water level in the desalting column is raised to provide a water depth with respect to the lower ion exchange resin layer, water is drained from the desalting column to fill the desalting column with the mixed resin A along with transfer water to form the upper ion exchange resin layer. COPYRIGHT: (C)2004,JPO&NCIPI |
