Strong Base Anion Exchange Resin (SBA resin) is a type of ion exchange resin designed to remove negatively charged ions (anions) such as chloride (Cl⁻), nitrate (NO₃⁻), sulfate (SO₄²⁻), and even weakly ionized compounds like silica (SiO₂) and carbon dioxide (CO₂). The resin’s functional group is a quaternary ammonium group (-NR₃⁺) bonded to a highly crosslinked polystyrene-divinylbenzene (PS-DVB) matrix.
SBA resins are typically used in deionization (DI) systems and demineralization processes, often paired with cation resins to completely purify water by removing both positive and negative ions. Depending on the application, SBA resin can be manufactured in two functional types:
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Type I: Offers better removal of weakly ionized species (like silica and CO₂), ideal for ultra-pure water.
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Type II: Easier to regenerate and lower in cost, often used for standard industrial applications.
In operation, water flows through a resin bed in the OH⁻ form, where anions in the water are exchanged for hydroxide ions. These hydroxide ions then combine with hydrogen ions (from cation resin beds) to form pure H₂O. The result is high-purity water for power plants, electronics manufacturing, food processing, and pharmaceutical production.
