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Overview of ion exchange resins
Source: | Author:佚名 | Publish time: 2019-05-28 | 52 Views | Share:
Using synthetic organic polymer ion exchange agent, its shape is much like the "resin" secreted by trees (such as turpentine, peach gum, etc.), the interior also has a mesh structure, so called ion exchange resin.

Using synthetic organic polymer ion exchange agent, its shape is much like the "resin" secreted by trees (such as turpentine, peach gum, etc.), the interior also has a mesh structure, so called ion exchange resin.

Ion exchange resin is a polymer compound with interchangeable groups. Ion exchange resin according to its polymer monomer, can be divided into styrene type, acrylic type and phenolic type and so on.


Most of the ion exchange resins commonly used in chemical water treatment are styrene type and acrylic type.

What is the structure of the ion exchange resin?

Ion exchange resin mainly consists of two parts: polymer skeleton and active group. (1) Polymer skeleton polymer skeleton is also known as the parent structure. It is a polymer compound with a mesh structure that is insoluble in acids or alkalis.

Polymer skeleton According to its polymerization monomer, can be divided into styrene type and acrylic type and so on.

(2) Active group active groups are composed of functional ions that are firmly bound to the polymer skeleton and cannot move freely, and interchangeable ions that can move freely: ① functional groups of ions.

Functional groups of ions determine the "acidic" or "alkaline" of ion exchange resins and the strength of the exchange capacity. Functional groups are strongly acidic, called strong acidic ion exchange resins.

Functional groups of ions are strongly acidic, called strong alkaline ion exchange resins.

Similarly, by the nature of functional ions, there are weak acids, weak bases and other types of ion exchange resins. ② Exchange ion Modern Exchange theory, ion exchange resin is regarded as a colloidal substance, polymer skeleton is "colloidal core", active group as the "double layer" of polymer skeleton. Among them, functional groups and partial exchange ions make up the "adsorption layer", and the other part can exchange ions to form the "diffusion layer".

Since interchangeable ions can be moved freely, they can be exchanged with the ions in the water with the same symbol. If the interchangeable ions on the ion exchange resin are cations, it is called H-type cationic exchange resin. Similarly, if the interchangeable ions are anions, it is called the OH-type anion exchange resin. The rest can be and so on.