Can resin be regenerated with nitric acid?
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Chlor-alkali chelating resin columns are generally regenerated using hydrochloric acid and alkali; can nitric acid be used? Will nitric acid react with the resin?
It is recommended that you ask the manufacturer; in my opinion it is absolutely not possible, as nitric acid has a strengthening effect, just as the presence of free chlorine can cause fatal damage to the resin.
Even if it doesn’t affect the resin, it still cannot be used; acid and alkali recovery or waste discharge will have adverse effects on wastewater and brine.
Resins should not be regenerated using nitric acid, as it possesses both strong oxidizing properties and nitrating capabilities, making it unsuitable for the regeneration of ordinary ion exchange resins, especially those with a low degree of cross-linking.