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Update 16 Mar 2022


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Ion exchange resin types

Strongly Acidic Cation Exchange Resins

Functional groups
—SO3 H+
Sulphonic acid
What they do In sodium form, they remove hardness (essentially calcium and magnesium) from water and other solutions
In hydrogen form, they remove all cations
They are also used as acidic catalysts
AmberliteTM HPR1200 Na
LewatitTM Monoplus S100
AmberliteTM IR120 Na
LewatitTM S100
Typical total capacity 1.9 to 2.2 eq/L [Na+]

Weakly Acidic Cation Exchange Resins

Functional groups
Carboxylic acid
What they do In hydrogen form, they remove preferentially divalent ions (e.g. calcium and magnesium) from solutions containing alkalinity
AmberliteTM HPR8300 H
AmberliteTM IRC83 H
LewatitTM CNP80
Typical total capacity 3.7 to 4.8 eq/L [H+]

Strongly Basic Anion Exchange Resins

Functional groups
—N(CH3)3+ OH
Quaternary ammonium
What they do In hydroxyl form, they remove all anions
In chloride form, they remove nitrate, sulphate and several other ions
AmberliteTM HPR4200 Cl
LewatitTM Monoplus M500
AmberliteTM IRA402 Cl
LewatitTM M500
Typical total capacity 1.0 to 1.5 eq/L [Cl]

Weakly Basic Anion Exchange Resins

Functional groups
What they do After cation exchange, they remove chloride, sulphate, nitrate, and other anions of strong acids, but they do not remove weak acids (SiO2 and CO2)
AmberliteTM HPR9600
AmberliteTM IRA96
LewatitTM Monoplus MP64
Typical total capacity 1.1 to 1.7 eq/L [free base]

Selective and chelating resins

Functional groups Many different types
What they do They remove metals, boric acid, perchlorate or other ions selectively
Function Resin type Removes
Triethylammonium Amberlite PWA5 NO3
Thiol Ambersep GT74 Hg, Cd etc.
Aminophosphonic Ambersep IRC747UPS Ca from brine
Iminodiacetic Ambersep IRC748UPS
Lewatit TP208
Ni, Cu etc.
Methyl glucamine Ambersep IRA743
Amberlite PWA10
Bis-picolylamine Ambersep M4195 Metals at low pH
Thiourea Lewatit TP214 Hg, Cd etc.
See details in Resin structure.

Further reading:

Amberjet, Amberlite, Ambersep, and Dowex are trademarks of DuPont. Lewatit is a trademark of Lanxess.

© François de Dardel