Title:
PURIFICATION METHOD FOR ACID SOLUTION
Document Type and Number:
Japanese Patent JP2023059066
Kind Code:
A
Abstract:
To provide a purification method capable of providing acid solution with further reduced impurity concentration.SOLUTION: A purified ion exchange resin is obtained by contacting an ion exchange resin to be purified with a mineral acid solution with a metal impurity content of 1 mg/L or less and a concentration of 5 wt.% or higher. The purification of acid solution using a purified ion exchange resin in which the amount of total metal impurities eluted when the purified ion exchange resin is passed through hydrochloric acid at a concentration of 3 wt.% by volume 25 times or less is 5 μg/mL-R or less. Preferably, the content of sodium (Na), calcium (Ca), magnesium (Mg), and iron (Fe) in the mineral acid solution is less than 200 μg/L each, and the ion exchange resin includes a styrene-type strong acid ion exchange resin with a particle size of 100 μm or more and 400 μm or less.SELECTED DRAWING: None
Inventors:
TAKADA TOMOKO
Application Number:
JP2021168956A
Publication Date:
April 26, 2023
Filing Date:
October 14, 2021
Export Citation:
Assignee:
ORGANO KK
International Classes:
C02F1/42; B01J39/05; B01J39/07; B01J41/05; B01J41/07; B01J45/00; B01J49/16; B01J49/18; B01J49/50; B01J49/60
Attorney, Agent or Firm:
Akio Miyazaki
Masaaki Ogata
Masaaki Ogata
Previous Patent: Engine control device and engine system
Next Patent: Lecture support system and method
Next Patent: Lecture support system and method