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Ion-exchange resin beads. An ion-exchange resin or ion-exchange polymer is a resin or polymer that acts as a medium for ion exchange, that is also known as an ionex. [1] It is an insoluble matrix (or support structure) normally in the form of small (0.25–1.43 mm radius) microbeads, usually white or yellowish, fabricated from an organic polymer substrate.
Sodium polystyrene sulfonate is used as a superplastifier in cement, as a dye improving agent for cotton, and as proton exchange membranes in fuel cell applications. In its acid form, the resin is used as a solid acid catalyst in organic synthesis, [16] mostly commonly under the tradename Amberlyst.
Idealized image of cation-exchange resin performing water softening. It shows sodium ions being released by the resin, and replaced with calcium ions captured from water. Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water.
In the case of a water softener, the cation exchange resin is exchanging sodium (the Na + ion of NaCl) for hardness minerals such as calcium and magnesium. A dealkalizer contains strong base anion exchange resin that exchanges chloride (the Cl – ion of the NaCl) for carbonate (CO − 3), bicarbonate (H C O − 3) and sulfate (SO 2− 4). As ...
Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids, and gases from water.The goal is to produce water that is fit for specific purposes.
A used Brita ("Maxtra" type) water purification filter cross-section with activated charcoal particles (black) and ion-exchange resin beads (white). Brita produces water jugs (BPA-free, made of styrene methyl methacrylate copolymer), and tap attachments with integrated disposable filters. The filters can be recycled. [3]