Title:
METHOD FOR PRODUCING CATION EXCHANGE RESIN AND METHOD FOR REFINING ORGANIC ACID SOLUTION
Document Type and Number:
WIPO Patent Application WO/2024/075406
Kind Code:
A1
Abstract:
Provided is a method for producing a cation exchange resin, in which the metal impurity content of a cation exchange resin is reduced, and metal elution is minimal even when the cation exchange resin is used in refining an organic acid solution. This method for producing a cation exchange resin comprises: a first reproduction step for bringing a mineral acid solution that has a metal impurity content of 1 mg/L or lower and a concentration of 5 mass% or higher into contact with a cation exchange resin (A), thereby obtaining a cation exchange resin (B); a refining step for bringing an organic acid solution that has a metal impurity content of 2 mg/L or lower and a concentration of 3 mass% or higher into contact with the cation exchange resin (B), thereby refining the organic acid solution; and a second reproduction step for bringing a mineral acid solution that has a metal impurity content of 1 mg/L or lower and a concentration of 5 mass% or higher into contact with the cation exchange resin (B) after the refining step, thereby obtaining a cation exchange resin (C).
Inventors:
TAKADA NORIKO (JP)
Application Number:
PCT/JP2023/029696
Publication Date:
April 11, 2024
Filing Date:
August 17, 2023
Export Citation:
Assignee:
ORGANO CORP (JP)
International Classes:
B01J49/53; B01D15/00; B01J39/05; B01J39/07; B01J39/20; B01J49/06; C08J5/20
Domestic Patent References:
| WO2018110177A1 | 2018-06-21 |
Foreign References:
| JPS57149813A | 1982-09-16 | |||
| JP2022070585A | 2022-05-13 | |||
| JP2002080209A | 2002-03-19 | |||
| JP2020001955A | 2020-01-09 |
Attorney, Agent or Firm:
MIYAZAKI Teruo et al. (JP)
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