Title:
METHOD FOR INHIBITING REDUCTION IN CONCENTRATION OF OXIDIZING AGENT IN SULFURIC ACID SOLUTION CONTAINING PERSULFURIC ACID COMPONENT
Document Type and Number:
WIPO Patent Application WO/2021/049064
Kind Code:
A1
Abstract:
According to the present invention, a heterocyclic compound having a structure in which a benzene ring and a nitrogen-containing heterocycle are are fused through condensation is added to a sulfuric acid solution that contains, as an oxidizing agent, a persulfuric acid component such as peroxomonosulfuric acid, a peroxomonosulfuric acid salt, peroxodisulfuric acid, or a peroxodisulfuric acid salt, and in which impurities that promote a reduction in the concentration of the oxidizing agent are present. Here, the heterocyclic compound having a structure in which a benzene ring and a nitrogen-containing heterocycle are fused through condensation is preferably a benzotriazole-based compound. Also, the impurities that promote a reduction in the concentration of the oxidizing agent are preferably one or more selected from a copper ion, an iron ion, a nitric acid ion, and a nitrous acid ion. The method for inhibiting a reduction in the concentration of an oxidizing agent in a sulfuric acid solution containing a persulfuric acid component according to the present invention can inhibit and minimize a reduction in the concentration of the oxidizing agent even when the sulfuric acid solution is contaminated with impurities that cause a reduction in the concentration of the oxidizing agent.
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| WO/2010/066017 | PROCESS FOR PURIFYING WASTE SULFURIC ACID |
| WO/2019/138065 | TUBULAR HEAT EXCHANGER HAVING CORROSION PROTECTION |
Inventors:
ISERI HAJIME (JP)
YAMAKAWA HARUYOSHI (JP)
YAMAMOTO YUZUKI (JP)
YAMAKAWA HARUYOSHI (JP)
YAMAMOTO YUZUKI (JP)
Application Number:
PCT/JP2020/007427
Publication Date:
March 18, 2021
Filing Date:
February 25, 2020
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
C01B17/69; C01B15/06; C07D235/04; C07D249/18; C23C18/20; C23G1/06; C25D5/56; C25D11/04; C25D11/06
Foreign References:
| JP2000044207A | 2000-02-15 | |||
| JP2015506583A | 2015-03-02 | |||
| US20050126588A1 | 2005-06-16 |
Attorney, Agent or Firm:
HAYAKAWA Yuzi et al. (JP)
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