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Ion exchange resins.

Ion exchange resins.

  • Ion exchange resins or polymers are the resins or polymer which act as a medium for ion exchange. For example Sodium polystyrene sulfonate.
  • Ion exchange is a reversible chemical reaction where the ions dissolve in a solution are removed and replaced by other ion of same electrical charge.
  • Ion exchange resins are normally in the form of small microbeads, usually white or yellowish in colour.
    Image license: CC-BY-SA
  • The beads are typically porous.
  • Most of these resins are made of polystyrene sulfonate.
    Polystyrene sulfonate.
  • Ion exchange resins consist of two main types namely cation exchange resins and anion exchange resins.
  • Cation exchange resins exchange positively charged ions.
  • Anion exchange resins exchange negatively charged ions.
  • Ion exchange resins are used for removal of calcium, magnesium, iron and manganese salts from water (water softening).
  • They are also used as an alternative to zeolites.
  • These resins are also used in biodiesel filtration process. Next

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