cation-exchange resin


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Related to cation-exchange resin: anion exchange resin

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). A cation-exchange reaction in removal of the Na+ of a sodium chloride solution is RSO3-H+ + Na+ → RSO3-Na+ + H+ (R is the polymer, RSO3- is the cation exchanger); if this is combined with the anion-exchange reaction, NaCl is removed from the solution (desalting). Cation exchange may also be used chromatographically, to separate cations, and medicinally, to remove a cation, for example, H+, from gastric contents, or Na+ and K+ in the intestine. See: anion 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
References in periodicals archive ?
The same picture is observed in spectra of cation-exchange resin saturated with copper and nickel ions.
Reduction of intensity of fluctuations of P-OH groups R for cation-exchange resin, containing ions of copper, nickel and sodium, appears with the reduction of quantity of P-OH groups having deformation fluctuations in the range of 2100-2600 [sm.sup.-1].
Reaction of polymeranalogous transformations of the received polymer were studied: by phosphorylation of polymer there was synthesized new, earlier not described phosphate cation-exchange resin with exchange capacity of 6 mg-ekv/g.
There were studied sorption and complexing characteristics of received ion-exchange resins among metals: copper, nickel, cobalt, and uranyl-ion, depending on pH-environment, the ionic form of ion-exchange resin, concentration of the investigated cation-exchange resins. It was shown that copper, nickel, cobalt and an uranyl-ion by phosphate cation-exchange resin sorbs at the expense of an ionic exchange and partially at the expense of formation of coordination bonds with ionogenic group of cation-exchange resin.
We were the first received and investigated new phosphate cation-exchange resins, nitrogen-phosphorus containing ion-exchange resins using chemical transformation of benzyl bromide-furfural polymers (Tursunov and Nazirova, 1985b; 1985c).
The presence of three functional groups, two acid hydroxyls and phosphoryl oxygen is characteristic to phosphorus-containing cation-exchange resins. In subacid and alkaline environments, at absence of complexing metals for these cation-exchange resins, usual dissociation with an exchange of cations is typical.
For phosphate cation-exchange resins various types of linkage of metal with ionogenic groups of ion-exchange resin are characteristic: ionic, mixed ionic-coordination and purely coordination.
"Research new monofunctional sulfonic acid cation-exchange resins and their use in processes of softening waters," Chemistry and Chemical Technology [Khimiya i Khimicheskaya Tekhnologiya], in Russian, pp.65-67