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Storngly Basic Anion Exchange Resins DIAION? series

An amino functional group is incorporated into the anion exchange resin enabling the exchange of anions like the Cl- ion and the SO4-- ion. Strongly basic anion exchange resins and weakly basic anion exchange resins can be defined according to the basic strength of the amino functional group. The ion exchange resin that has a quaternary ammonium group is strongly alkaline and dissociates just like NaOH and KOH. Therefore it is called a strongly basic anion exchange resin.
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Storngly Basic Anion Exchange Resins DIAION™ series

An amino functional group is incorporated into the anion exchange resin enabling the exchange of anions like the Cl- ion and the SO4-- ion. Strongly basic anion exchange resins and weakly basic anion exchange resins can be defined according to the basic strength of the amino functional group. The ion exchange resin that has a quaternary ammonium group is strongly alkaline and dissociates just like NaOH and KOH. Therefore it is called a strongly basic anion exchange resin.

Characteristics

The strongly basic anion exchange resin is an anion exchange resin with quaternary ammonium groups incorporated into the styrene frame. Two types with differing alkalinity strengths are: Type I with a trimethyl ammonium group, and Type II with a dimethylethanol ammonium group.

The strongly basic resin is used to produce high purity demineralized water, making use of the capability to strongly adsorb anions.

Strongly Basic Anion Exchange Resin Chemical Structures

1) Type I Structure: Strongly basic anion exchange resin

2) Type 2 Structure: Strongly basic anion exchange resin

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 Characteristics

The strongly basic anion exchange resin's functional group behaves as a strong base making it possible to use the resin across the full pH range 0-14.

The following reactions show that the resin can carry out ion exchange not just with a mineral acid, but also with a salt like NaCl. In addition, the resin can carry out exchange capture of weak acids in solution such as silicic acid(aqueous silica) and carbonic acid.

?R-N?OH + NaCl  →  R-N?Cl + NaOH

?R-N?OH + HCl   →  R-N?Cl + H2O

?R-N?OH + SiO2   →  R-N?HSiO3

(R represents the ion exchange resin matrix.)

Regeneration of the strongly basic anion exchange resin is usually performed with about 4% NaOH solution. It cannot practically be regenerated with a weak base like NH4OH.

The reactions below show the regeneration of a strongly basic anion exchange resin that was previously loaded with Cl- ions.

?R-N?Cl + NaOH   →   R-N?OH + NaCl

As with the strongly acidic cation exchange resin, it is relatively difficult to regenerate the strongly basic anion exchange resin. For practical purposes, the required amount of regenerant solution is several times the theoretical chemical equivalent.

Applications

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

■Usage

Packed column or Batch processing

Lineup / Specifications

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

These styrene-based resins use quaternary ammonium groups for the exchange groups. Two types with differing alkalinity strengths are: Type I with a trimethyl ammonium group, and Type II with a dimethylethanol ammonium group.

There are the gel type SA series, the porous PA series, and the highly porous HPA25(Type I) versions. The ionic form of the standard products is the Cl- form.

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• SA Series(Gel Type I, Gel Type II)

Type I SA10A and SA12A as well as Type II SA20A are standard gel type products for water treatment applications.

• UBA120(Gel Type I, Uniform Bead Size)

In recent years, various improvements in water purification equipment combined with uniform bead diameter resin have enabled reduction of chemical costs and reduction in required resin regeneration solution volumes. Also in applications beyond water purification, the many advantages of uniform bead size have increasingly made their use a necessity. One advantage is that there are no large-diameter beads that are prone to breakage due to swelling and contraction.

According to this growing need, we have made uniform bead size available for the most widely used general purpose ion exchange resins.

• PA300 Series(Porous Type I)

• PA400 Series(Porous Type II)

Although PA400 has a macro-porous matrix structure, it's durability with swelling and contraction is high. Compared to the gel type products, it has comparable cross-linking, slightly higher moisture content, and lower total exchange capacity. It is an effective resin when high water processing quality is required, such as when removal of silica to low concentration is needed. It is also useful for water processing situations in which the incoming raw water contains a lot of organic matter or when organic contamination is a concern. PA316 is normally used for water treatment. PA308 is used for demineralization and decolorization of sugar or carbohydrate solutions.

• HPA25(Highly Porous Type I)

The Highly Porous HPA25 has a higher degree of cross-linking and is more porous than the Porous products. HPA25 is used for special applications.

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