ION EXCHANGE METHOD AND ION EXCHANGE COLUMN USED FOR ION EXCHANGE METHOD

摘要

PROBLEM TO BE SOLVED: To provide an ion exchange method and a ion exchange column capable of producing high purity water without the regeneration defects in clamping and the leakage of impurity ions such as silica leaf. ;SOLUTION: The ion exchange method is composed of a water passing process for passing a water to be treated through a strongly acidic cation exchange resin layer and a strongly basic anion exchange resin, which are formed respectively as an upper layer 12 and a lower layer 13 in the same main body of the column 11, from the upper layer 12 to the lower layer 13 in downflow and a regeneration process including an operation of passing respective regenerating agents to each ion exchange resin layer in upperflow and the water passing process and the regeneration process are alternately performed. In such a case, both ion exchange resins are not back washed at the same time in the regeneration process after the water passing process is finished, at first a regenerating agent for a strongly alkaline anion exchange resin is passed through the strongly alkaline anion exchange resin layer of the lower layer 13 and next a regenerating agent for a strongly acidic cation exchange resin is passed through the strongly acidic cation exchange resin layer of the upper layer 12.;COPYRIGHT: (C)1998,JPO