Ion-Exchange Resins

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  • An insoluble matrix usually available in the form of small (12 mm diameter) beads, usually white or yellowish, fabricated from an organic polymer substrate known as ion exchange resin/Polymer.
  • Ion exchange resins are polymers capable of exchanging particular ions within the polymer with ions in a solution that is passed through them.
  • Properties are highly ionic, covalently cross-linked, insoluble polyelectrolytes.
  • Depending upon the nature of the exchangeable ion of the resin as a cation or anion ,these can be classified as cationic or anionic exchange resins.
  • The first step in the synthesis of strong acid cation and anion exchange resins is a polymerization
  • Ion-exchange resins are widely used in different separation, purification, and decontamination
    processes. Common examples are water softening and water purification.
  • In many cases ,Ion-exchange resins were introduced in  processes as a more flexible alternative to the use of natural or artificial zeolites.
  • Ion-exchange resins are used to remove poisonous (e.g. copper) and heavy metal (e.g. lead or
    cadmium) ions from solution, replacing them with ions, such as sodium and potassium.
  • In the manufacture of fruit juices such as orange and cranberry juice, where ion exchange resins are used to remove bitter tasting components and also improves the flavor.
  • Macroporous ion exchange resins act as a absorbers that efficiently bind color impurities. In addition, decolorization also be done.
  • The resins are prepared as spherical beads 0.5 to 1.0 mm in diameter.
  • In Industrial usage, resin is usually regenerated every 12 to 48 hours.
  • Ion-exchange resins are considered as the true commodity corner in water treatment.
  • Capacity of ion exchange resin is defined as total number of chemical equivalents available for exchange per some unit weight or unit volume of resin.
  • In both beads and powder form, resins are used extensively in all types of nuclear power plants in order to minimize corrosion.
  • Uses extends in pharmaceutical formulations as ranged from simple Excipients for tablet , capsules as disintegration to the rate controlling function in extended release formulations.
  • Offers high potential for many innovative applications such as purification of concentrated chromic acid bath, trivalent chrome bath recycling, acid purification/retardation, precious metal recovery etc.
  • Due to the versatile utility of ion exchange resins, they are being used for various drug delivery and therapeutic applications.

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