Acrylic-based
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.

ION-EXCHANGE RESINS[Open in a new window]

Characteristics

[Close]

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

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

[Close]

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

Usage

Packed column or Batch processing

Lineup / Specifications

[Close]

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 WA10 WA20 WA21J WA30

Refer to the "ION EXCHANGE RESINS "[別窓表示]websites for more details.

View the products of Separation Materials Dept.[Open in a new window]