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Lower Acidity, Better Regeneration

Merck’s strongly basic anion exchangers are highly resistant to acids, bases, aliphatic and aromatic solvents, as well as reducing and oxidizing agents. They have a slightly lower acidity than Type I strongly basic anion exchangers. Hence, they offer better regeneration, and slightly reduced adsorption of silicic acid.

In the reaction, neutral salts disintegrate into the corresponding base, whereas ion exchangers are transferred into salt form. Ion exchangers in the OH- form adsorb very weak acids, such as boric and silicic acids. The resin’s exchange capacity is independent of the pH value of the solution to be exchanged. The quaternary ammonium groups possess an ionization degree corresponding to that of alkali hydroxides.

Features and Benefits

  • Lower acidity than Type I strongly basic anion exchangers
  • Better regeneration and slightly reduced adsorption of silicic acid
  • Exchange capacity independent of pH value
  • Ionization degree similar to alkali hydroxides

Range of Applications

    1.  Water treatment
      • Full demineralization
      • Decarbonization
      • Desalination
      • Removal of silicic acid
      • Separation of amino acids
    2.  Others
      • Acidimetric determination of aqueous salt solutions
      • Isolation of complex bases
      • Isolation and determination of alkalis
      • Removal of interfering anions
      • Catalysis
      • Purification of formaldehyde
      • Determination of pectins in fruit juices

    Product Information

    Ion exchanger 
    III  pro analysis
    Amberlite IRA-402
    Amberlite IRA-410
    Amberjet 4200 CL
    Dowex 1x8
    Order number 104767 112463 115262 105245 105242
    Matrix Type I Gel Type I Gel Type II Gel Type I Gel Type I Gel
    Functional groups ~N+(CH3) 3 ~N+(CH3) 3 ~N+(CH3)2(CH2
    ~N+(CH3) 3 ~N+(CH3) 3
    Counter ion/supplied as OH- Cl- Cl- Cl- Cl-
    Total ion exchange capacity (mval/mL) >0.9 >0.9 > 1.35 ≥ 1.3 ≥ 1.2
    Maximum swelling % 18-22 18-22 15 About 30%
    Max. operating temperature °C OH-: 60
    Cl-: 100
    OH-: 60
    Cl-: 80
    OH-: 40
    Cl-: 80
    Cl-: 60 Cl-: 66
    pH range 0-14 0-14 0-14 0-14 0-14
    Particle size (mm) (mesh) ASTM 0.3-1.2
    0.6-0.8 0.09-0.25
    Moisture content % 50-60 50-60 40 49-55%
    Bulk density (g/l) 800 700 700 670 705
    Regenerant Concentration in water % NaCl
    or NaOH
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