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Waterdemineralization 160510120537
- 2. Demineralization is the removal of essentially all inorganic salts. In ion exchange demineralization hydrogen Cation exchange converts dissolved salts to their corresponding acids, and basic anion exchange removes these acids. Purpose Removal of ionic substances Reduction of conductivity Control of pH
- 4. Demineraliser Resins Cationic resins exchange positively charged functional groups, for undesirable positive ions. With their functional groups in the hydrogen form, R – H, “R” represents the exchange resin and “H” represents the attached hydrogen ion. Anionic resins exchange negatively charged functional groups for any undesirable negative ion. The hydroxyl ion, OH- (R—OH) is commonly used as the functional group in an anion resin.
- 5. Principle Of Demineralization The demineralizer system consists of one or more ion exchange resin columns, including a strong Cation unit and a strong anion unit. The Cation resins exchange hydrogen for raw water cations as shown below:
- 6. The anion resins exchange hydroxyl for raw water anions. In the example, the acids resulting from the Cation exchange process react with the anion exchange resin. As a result we form water and the anions are embedded into the resin. Other weak acids are also removed because the resin is strongly basic.
- 7. Ion Exchange Reaction water.freshformresult weaAssolution.inionsby the exchangedareresintheinionsthat theisresultnetThe RR :followsasisreactionnetThe arrow.by theindicatedasreactionreversibleaisThis H :waterformto combineresinzingdemineraliby thereleasedionsThe ions.chlorideandionssodiumform tosdissociateitwaterindissolvedisNaClWhen -- 2 2 OHHClRNaClNaOHRH OHOH ClNaNaCl OH
- 9. REGENERATION Cation exchange resins are regenerated by treatment with hydrochloric or sulfuric acid, then washing with water. Anion exchange resins are regenerated by treatment with sodium hydroxide (NaOH), then washing with water.