Ion exchange is the reversible interchange of ions between a solid. (ion exchange material) and a liquid in which there is no permanent change in the structure. Anion-exchange resin: separation and purification: Chromatography: ions can be separated; an anion-exchange resin has positively charged sites. Ion exchange (IX) resin technology has been used extensively as a practical and effective form of water treatment for many years. IX is often.


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It cannot practically be regenerated with a weak base like NH4OH. The reactions below show the regeneration of a strongly basic anion exchange resin anion exchange resin was previously loaded with Cl- ions.

Storngly Basic Anion Exchange Resins "DIAION™ series" | Products | Mitsubishi Chemical Corporation

For practical purposes, the required amount of regenerant solution is several times the theoretical chemical equivalent. Zirconium is practically transparent to free neutrons, used in building reactors, anion exchange resin hafnium is a very strong absorber of neutrons, used in reactor control rods.

Catalysis[ edit ] In chemistry ion-exchange resins in the acid form are known to catalyze organic reactions.

See for instance self-condensation. Juice purification[ edit ] Ion-exchange resins are used in the manufacture of fruit juices such as orange and cranberry juice, where they are used to remove bitter-tasting components and so anion exchange resin the flavor.

Ion-exchange resin

Anion exchange resin allows tart or poorer-tasting fruit sources to be used for juice production. Sugar manufacturing[ edit ] Ion-exchange resins are used in the manufacturing of sugar from various sources. They are used to help anion exchange resin one type of sugar into another type of sugar, and to decolorize and purify sugar syrups.

Pharmaceuticals[ edit ] Ion-exchange resins are used in the manufacturing of pharmaceuticals, not only for catalyzing certain reactions, but also for isolating and purifying pharmaceutical active ingredients.

What Is Ion Exchange Resin and How Does It Work?

Three anion exchange resin resins, sodium polystyrene sulfonatecolestipoland cholestyramineare used as active ingredients. Sodium polystyrene sulfonate is a strongly acidic ion-exchange resin and is used to treat hyperkalemia. Colestipol is a weakly basic ion-exchange resin and is used to treat hypercholesterolemia.

SAC resins can be damaged by oxidants and fouled by iron or anion exchange resin, so care must be taken to avoid exposure of the resin to these materials. Weak acid cation resins Weak acid cation WAC exchange resins remove cations associated with alkalinity temporary hardness and are used for demineralization and dealkalization applications.

These counterions will continue to bond with the functional groups until equilibrium is reached. During an IX cycle, the solution to be treated would be added to the IX resin bed and allowed to flow through the anion exchange resin.


As the solution moves anion exchange resin the IX resin, the functional groups of the resin attract any counterions present in the solution.

If the functional groups have a greater affinity for the new counterions than those already present, then the ions in solution will dislodge the existing ions and take anion exchange resin place, bonding with the functional groups through shared electrostatic attraction.

Ion-exchange resin - Wikipedia

In this example, the softening mechanism consists of a cation exchange resin where sulphonate anion SO3— functional groups are fixed to the IX resin matrix. What is resin regeneration? Over time, contaminant ions bind with all available exchange sites in the IX resin.

Once anion exchange resin resin is exhausted, it must be restored for further use through anion exchange resin is known as a regeneration cycle.

Anion-exchange resin

During a regeneration cycle, the IX reaction is essentially reversed through anion exchange resin application of a concentrated regenerant solution. Depending anion exchange resin the type of resin and the application at hand, the regenerant may be a salt, acid, or caustic solution.

As the regeneration cycle proceeds, the IX resin releases contaminant ions, swapping them for ions present in the regenerant solution. The contaminant ions will exit the IX system as part of the regenerant effluent stream, and will need to be properly discharged.

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