Update 28 Jun 2015


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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
AmberjetTM 1000 Na
DowexTM Marathon C
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
Examples AmberliteTM IRC86
DowexTM MAC3
LewatitTM CNP80
Typical total capacity 3.7 to 4.5 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
AmberjetTM 4200 Cl
DowexTM Marathon A
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)
Examples AmberliteTM IRA96
DowexTM Marathon MWA
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 Amberlite IRC747 Ca from brine
Iminodiacetic Amberlite IRC748
Lewatit TP208
Ni, Cu etc.
Methyl glucamine Amberlite IRA743
Amberlite PWA10
Bis-picolylamine Dowex 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 the Dow Chemical Company.
Lewatit is a trademark of Lanxess.

© François de Dardel