ion exchange

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Related to Anion exchanger: Cation exchanger, Anion Exchanger 1

ion exchange

the process in which ions are exchanged between a solution and an insoluble solid, usually a resin. It is used to soften water, to separate radioactive isotopes, and to purify certain industrial chemicals

Ion Exchange


the exchange of ions in electrolytic solutions (homogeneous ion exchange). When dilute electrolytic solutions, such as NaCl and KNO3, are mixed, Na+, K+, NO3, and Cl ions are present in the mixture. The state of equilibrium for this case is expressed by the equation NaCl + KNO3 ⇄ NaNO3 + KCl (double-exchange reaction). If one of the substances produced during the interaction is less dissociated than the others, the equilibrium shifts toward the formation of the poorly dissociated substance. The equilibrium also shifts toward the formation of a volatile or poorly soluble product (if it is precipitated from the particular phase) according to the reactions

H2SO4 + 2KCN ⇄ K2SO4 + 2HCN ↑

NaCl + AgNO3 ⇄ NaNO3 + AgCl↓ I

The crystallization of a salt (ion combination), which has lower solubility, is the first process to take place upon evaporation of an equilibrium solution. The selectivity of crystallization may also be caused by the addition of organic solvents, such as alcohol, acetone, or dioxane.

During heterogeneous ion exchange (ion-exchange sorption), exchange takes place between ions that are in solution and those that are on the surface of the solid phase (the ion exchanger). When an ion exchanger saturated with one ion (such as H+) comes into contact with a solution containing other ions (for example, Na+ and Ca2+), ion exchange occurs between the ion exchanger and the solution: the concentration of Na+ and Ca2+ in the solution is reduced, and an equivalent quantity of H+ ions appears.

Heterogeneous ion exchange takes place during sorption of certain minerals (aluminosilicates, metallic hydroxides, and zeolites) from electrolytic solutions in the cells and membranes of living organisms and in synthetic ion-exchange sorbents. This type of ion exchange is widely used for the desalinization of water used to feed high-pressure steam boilers, as well as in hydrometallurgy and the chemical and pharmaceutical industries.


ion exchange

[′ī‚än iks‚chānj]
(physical chemistry)
A chemical reaction in which mobile hydrated ions of a solid are exchanged, equivalent for equivalent, for ions of like charge in solution; the solid has an open, fishnetlike structure, and the mobile ions neutralize the charged, or potentially charged, groups attached to the solid matrix; the solid matrix is termed the ion exchanger.
References in periodicals archive ?
PAP in the HEPES 2 group was a little bit higher than the control hypoxic group, which is again suggesting the role of anion exchanger on the acute phase of HPV.
Overall, since the role of the anion exchanger in the superoxide release has been indicated, and the role of reactive oxygen species in HPV has been proposed, therefore, HC[O.
3-] in the cation exchanger, while NaOH solution of the 1 mol/l was introduced for the anion exchanger, leading to adsorption of O[H.
Metito will deploy a conventional demineralisation plant featuring the latest industry equipment, consisting a degassed water tank, strong base anion exchanger, chemical injection pumps, air blower systems and a regeneration system that uses bulk chemicals.
Separate cation or anion exchangers are used in the demineralisation stage, while fine cleaning after reverse osmosis is carried out with a mixed-bed exchanger.
The pre-validated chromatography columns can come packed with either strong cation exchangers, weak cation exchangers or strong anion exchangers, eliminating manual column packing and cleaning, according to the company.
These pre-validated chromatography columns come packed with either strong cation exchangers, weak cation exchangers or strong anion exchangers, freeing up end users' time and resources by eliminating manual column packing and cleaning.
Cation exchangers remove calcium, magnesium, sodium, and other positive ions, acting like ordinary zeolite; and anion exchangers remove carbonates, bicarbonates, sulfates, chlorides, and other negative ions.
Separate cation or anion exchangers are used in the demineralization stage, while fine cleaning after reverse osmosis is carried out with a mixed-bed exchanger.
Plant /OR 10 m3 per hour Softening Plant /OR Supply of Complete unit of 10 m3 per hour capacity Cation & Anion Exchangers in any other PSUs/any other reputed industries during - 07 years duration(Anytime during the Year-2008 to year-2014.