ion exchange


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an·i·on ex·change

(an'ī-on eks-chānj'),
The process by which an anion in a mobile (liquid) phase exchanges with another anion previously bound to a solid, nonmobile, positively charged phase, the latter being an anion exchanger. For example, the process takes place when Cl- is exchanged for OH- in desalting. The reaction is Cl- (in solution) + (OH- on anion exchanger+) → (Cl- on anion exchanger) + OH- (in solution); in combination with the cation exchange, NaCl is removed from solution. Anion exchange may also be used chromatographically, to separate anions, and, medicinally, to remove an anion (for example, Cl-) from gastric contents or bile acids in the intestine.

ion-ex·change chro·ma·tog·ra·phy

(ī'on-eks-chānj' krō'mă-tog'ră-fē)
Chemical investigation in which cations or anions in the mobile phase are separated by electrostatic interactions with the stationary phase.
See also: anion exchange, cation exchange

cat·i·on ex·change

(kat'ī-on eks-chānj')
The process by which a cation in a liquid phase exchanges with another cation present as the counter-ion of a negatively charged solid polymer (cation exchanger). Cation exchange may be used chromatographically, to separate cations, and medicinally, to remove a cation.
See also: anion exchange

an·i·on ex·change

(an'ī-on eks-chānj')
The process by which an anion in a mobile (liquid) phase exchanges with another anion previously bound to a solid, positively charged phase, the latter being an anion exchanger. Anion exchange may also be used chromatographically, to separate anions, and medicinally, to remove an anion (e.g., Cl-) from gastric contents or bile acids in the intestine.

ion exchange

A reversible chemical reaction in which ions in a solution are replaced by others with like charge from an insoluble solid such as an ION EXCHANGE RESIN. The process is used for softening hard water, purifying sugar, separating radioactive isotopes and for other purposes.
References in periodicals archive ?
LANXESS developed the Lewatit NM 3367 mixed bed ion exchange resin for desalinating filling and top up water in modern water heating installations.
Many companies, offering ion exchange resins, are actively trying to increase their product portfolio and regional presence to cater different regional markets.
The removal efficiency was found as 92 percent in case of ion exchange resins as well as with activated carbon using as filtration media (Table-3) whereas removal efficiency was found 94 percent in mix bed resin.
In the case of ion exchange resin, the grade and processing of the resin will have a direct effect on the quality of the final product water.
The agency could upgrade its outlook to "positive" if Ion Exchange improves its stand-alone market position in the sector and records a notable growth in its revenues and operating margin.
Ion Exchange offers a range of drinking water purifiers and water conditioners to provide total water care for homes.
Some texts warn that ion exchange will put high levels of sodium into the wine--but that depends entirely on the resin of choice.
In general, the ion exchanger adsorbs counter ions of the ion exchange group.
Rohm and Haas Company today announced an energy surcharge for its ion exchange resins sold in the United States and Canada.
Production will begin in two years at the same time as the launch of the new ion exchange resin plant of the Ion Exchange Resins business unit.
They explain variations in the solvent sorption equilibria and kinetics of polymer-based ion exchange resins, examine cation exchange resins to separate the products as they are formed in synthesis, describe ion exchange resins in drug delivery, analyze biopolymers as supports for heterogeneous catalysis (using an aminopolysaccharide as a case study), describe how ion exchange selectivity serves as a surrogate indicator of the relative permeability of homovalent ions in reverse osmosis processes, describe a new versatile biopolymer for processing metal ions (including separation, purification and concentration), and provide new findings in short-bed ion exchange.
The high purity water the boilers need is supplied by an ion exchange plant installed in 1976.