| 摘要 |
PURPOSE:To remove polyvalent ions more efficiently compared with a conventional method and significantly suppress reduction of the ion exchange capacity due to adsorption and accumulation of polyvalent ions by allowing a strong acid cation exchange resin to react with an aq. soln. of sodium hydroxide and further regenerating the resin with sufuric acid or hydrochloric acid. CONSTITUTION:A strong acid cation exchange resin is made to react with an aq. soln. of sodium hydroxide and then regenerated with sufuric acid or hydrochloric acid. Thereby, polyvalent ions can be efficiently removed compared with a conventional method and reduction of ion exchange capacity due to adsorption and accumulation of polyvalent ions can be significantly suppressed. Further, even when sulfuric acid of high concn. is used, the strong acid cation exchange resin can be efficiently regenerated without causing precipitation of insoluble salt such as calcium sulfate. Thus, the amt. of regenerating agent and waste liquid for regeneration can be decreased. |
