Title:
RECOVERY METHOD FOR WEAK ACID CATION EXCHANGE RESIN
Document Type and Number:
WIPO Patent Application WO/2015/159948
Kind Code:
A1
Abstract:
Provided is a recovery method for efficiently recovering a weak acid cation exchange resin that has adsorbed a hardness component. This invention is a method for recovering a sodium-type weak acid cation exchange resin that has been used in a softening treatment for water to be treated that contains a hardness component, wherein the method comprises a first recovery treatment step in which a mineral acid is brought into contact with the weak acid cation exchange resin and a second recovery treatment step in which, after the contact with the mineral acid, an aqueous solution of a sodium-containing alkali compound is brought into contact with the weak acid cation exchange resin.
Inventors:
IKUNO NOZOMU (JP)
KUROBE HIROSHI (JP)
KUROBE HIROSHI (JP)
Application Number:
PCT/JP2015/061706
Publication Date:
October 22, 2015
Filing Date:
April 16, 2015
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
B01J49/00; B01J39/04; C02F1/42
Foreign References:
| JPS55116485A | 1980-09-08 | |||
| JPH10230170A | 1998-09-02 | |||
| JPS5534168A | 1980-03-10 | |||
| JPS516867A | 1976-01-20 | |||
| JPS4820701B1 | 1973-06-22 |
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (JP)
Takeshi Shigeno (JP)
Takeshi Shigeno (JP)
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