Ionenaustausch-Wasserenthärtung und -Entionisierung
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Unerwünschte Ionen gegen gereinigtes Wasser tauschen
Übersicht
Ion exchange (IX) is a reversible chemical process where dissolved ions in water are exchanged for similarly charged ions on a solid resin matrix. Cation exchange resins (sulfonated polystyrene) swap Ca2+ and Mg2+ for Na+ or H+, softening or deionizing water. Anion exchange resins (quaternary amine polystyrene) swap anions like Cl-, NO3-, and SO42- for OH-. IX is used in residential and industrial water softening, pharmaceutical-grade water production, nuclear power condensate polishing, and sugar decolorization. Global ion exchange resin production exceeds 600,000 tons annually.
Chemischer Prozess
Hard water passes through a column packed with strong acid cation exchange resin (R-SO3Na). Calcium and magnesium ions replace sodium ions on the resin: R-SO3Na + Ca2+ -> (R-SO3)2Ca + 2Na+. When the resin is exhausted, it is regenerated by backwashing with concentrated NaCl brine, which reverses the exchange. For deionization, cation and anion resins are used in series or mixed bed configuration, producing water with resistivity >18 MOhm.cm.
R-N(CH3)3OH + Cl- -> R-N(CH3)3Cl + OH- (deionization, anion exchange)
Regeneration: (R-SO3)2Ca + 2NaCl -> 2R-SO3Na + CaCl2 (brine regeneration)
Rohstoffe
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Sulfonated polystyrene-DVB resin (cation exchanger) — Suspension polymerization of styrene-divinylbenzene, sulfonated (Exchanges Ca2+/Mg2+ for Na+ or H+)
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Quaternary amine polystyrene-DVB resin (anion exchanger) — Chloromethylation and amination of PS-DVB beads (Exchanges Cl-/SO42- for OH-)
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Sodium chloride brine (NaCl) — Salt dissolution (Cation resin regenerant)
Endprodukte
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Softened water (<1 mg/L hardness) — Industrial boilers, laundry, residential use (Ca/Mg replaced by Na -- TDS unchanged)
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Deionized water (>18 MOhm.cm) — Semiconductor fabrication, pharmaceutical, laboratory (Produced by mixed bed IX or EDI)
Environmental Impact
Ion exchange regeneration produces high-salinity waste brine containing concentrated calcium, magnesium, and sodium chloride. Brine disposal can increase the salinity of receiving waters. Resin manufacturing uses styrene (a volatile organic compound) and divinylbenzene. Spent resins require incineration or landfill disposal. More efficient regeneration schemes and brine recycling reduce waste.
Sicherheitshinweise
- ⚠ Concentrated brine and acid/alkali used in regeneration are corrosive
- ⚠ Resin manufacturing involves styrene -- flammable and potential carcinogen
- ⚠ Anion resin manufacture uses chloromethyl ether -- extremely toxic carcinogen
- ⚠ Pressurized resin columns require proper vessel maintenance
Neuere Innovationen
Electrodeionization (EDI) combines IX with electrodialysis for continuous, chemical-free deionization.
Magnetic ion exchange (MIEX) resin enables rapid mixing and separation in water treatment.
Chelating resins selectively remove heavy metals (Cu, Ni, Pb) from industrial wastewater.
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