| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate trouble caused by simultaneously changing cation and anion exchange resins when ion exchange resins packed in a mixed bed ion exchange column are changed. <P>SOLUTION: An anion exchange resin packed in a mixed bed ion exchange column is changed for a new one while leaving a cation exchange resin in the column, and after the lapse of a prescribed period of time, the packed cation exchange resin is changed for a new one. <P>COPYRIGHT: (C)2004,JPO |
