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Weakly Basic Anion Exchange Resins DIAION? series

The weakly basic anion exchange resins use either a polystyrene or polyacrylic ester frame and a primary-ternary amino group as the functional group. Although the anion of a salt like NaCl or Na2SO4 cannot be exchanged, the exchange of an anion of a mineral acid such as HCl and H2SO4, or the salt of a weak base like NH44Cl can be carried out.
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Weakly Basic Anion Exchange Resins DIAION™ series

The weakly basic anion exchange resins use either a polystyrene or polyacrylic ester frame and a primary-ternary amino group as the functional group. Although the anion of a salt like NaCl or Na2SO4 cannot be exchanged, the exchange of an anion of a mineral acid such as HCl and H2SO4, or the salt of a weak base like NH44Cl can be carried out.

Characteristics

Resins using the primary-ternary amino groups as functional groups behave like weak bases and are therefore called weakly basic anion exchange resins.

 Characteristics

Because the weakly basic anion exchange resin has a weakly alkaline functional group, in basic solution it does not dissociate and therefore has no ion exchange ability.

Although the anion of a salt like NaCl or Na2SO4 cannot be exchanged, the anion of a mineral acid such as HCl and H2SO4, or the salt of a weak base like NH44Cl can be carried out as shown in the reactions below.

• R-NH2 + HCl  → R-NH3Cl

• R-NH2 + NH4Cl → R-NH3Cl + NH3

Weak acid is generally hard to capture, and although there is a resin with which H2CO3 is exchangeable, silicic acid(silica) cannot be exchanged.

An advantage of the weakly basic resin is that it is easy to regenerate. Of course NaOH, but even Na2CO3, NH3, etc. can be used for regeneration. And this regeneration is economical as only slightly more than the theoretical chemical equivalent amount of regenerant solution is required.

Applications

Applications include water treatment as well as purification of pharmaceuticals and food.

■Usage

Packed column or Batch processing

Lineup / Specifications]

Mitsubishi Chemical's Weakly Basic Anion Exchange Resins are listed below.

Substrate

Acrylic-based

Styrene-based Polyamine Type

Styrene-based Dimethylamine Type

Product Name

WA10

WA20

WA21J

WA30

Structure

Greenherbs

Greenherbs

Greenherbs

• Acrylic-based WA10

This product has good regeneration efficiency and high chemical stability. Although it is not a porous product, it features good resistance to organic contamination.

• Styrene-based WA20 Series(Polyamine Type)

It has excellent chemical stability, wear resistance, and temperature stability. And since it is porous, it excels in resistance to organic contamination. Although it cannot decompose salts, its total exchange capacity is large, and regeneration efficiency is excellent. WA21J is highly porous, and has excellent strength, but has lower total exchange capacity than WA20.

• Styrene-based WA30(Dimethylamine Type)

This product has good regeneration efficiency and comparatively high chemical stability. Strength and temperature stability are excellent. Because it is highly porous, its resistance to organic contamination is really outstanding.

We could not find any corresponding parameters, please add them to the properties table

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