Title:
ACID SOLUTION PURIFICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2023/062925
Kind Code:
A1
Abstract:
The present invention provides a purification method that can provide an acid solution in which the impurity concentration has been further reduced. The present invention provides an acid solution purification method wherein a purified ion exchange resin is used. The purified ion exchange resin is obtained by bringing a mineral acid solution with a metal impurity content of 1 mg/L or less and a concentration of 5 wt% or greater into contact with an ion exchange resin to be purified, thereby purifying the same. When hydrochloric acid with a concentration of 3 wt% is passed through this purified ion exchange resin at a volume ratio of 25 times, the total metal impurity elution quantity that is eluted is 5 μg/mL-R or less. The sodium (Na), calcium (Ca), magnesium (Mg), and iron (Fe) contents of the mineral acid solution are preferably each 200 μg/L or less, and the ion exchange resin includes a styrene-type strongly acidic ion exchange resin with a grain size of 100 μm to 400 μm.
Inventors:
TAKADA NORIKO (JP)
Application Number:
PCT/JP2022/030571
Publication Date:
April 20, 2023
Filing Date:
August 10, 2022
Export Citation:
Assignee:
ORGANO CORP (JP)
International Classes:
B01J45/00; B01J39/05; B01J39/07; B01J41/05; B01J41/07; B01J47/016; B01J49/16; B01J49/18; B01J49/50; B01J49/60; C02F1/42
Domestic Patent References:
| WO2018092395A1 | 2018-05-24 |
Foreign References:
| JP2007117781A | 2007-05-17 | |||
| JP2019141800A | 2019-08-29 | |||
| JP2017018846A | 2017-01-26 | |||
| JP2019188300A | 2019-10-31 | |||
| JP2003112060A | 2003-04-15 |
Attorney, Agent or Firm:
MIYAZAKI Teruo et al. (JP)
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