Physical structure of ion exchange resin

Ionic resins are often divided into two types: gel type and macroporous type.

The polymer skeleton of gel-type resin has no pores inside when dry. It swells when it absorbs water and forms very fine pores between the macromolecular chains, usually called micro-pores. The average pore diameter of the wet resin is 2 to 4 nm (2×10-6 to 4×10-6 mm).

This kind of resin is more suitable for adsorbing inorganic ions, and their diameter is small, generally 0.3 ~ 0.6nm. This type of resin cannot absorb macromolecular organic substances, because the latter is larger in size, such as protein molecules with a diameter of 5-20 nm, and cannot enter the microscopic pores of this type of resin.

Macroporous resin is made by adding a porogen during the polymerization reaction to form a porous sponge-like structure with a large number of permanent micropores inside, and then introducing exchange groups. It has both micro-pores and macro-pores, the pore size of the wetting resin reaches 100-500nm, and its size and quantity can be controlled during manufacture. The surface area of ​​the pores can be increased to more than 1000m2/g. The finishing of Jiangsu Secosets Resin Co., Ltd. not only provides good contact conditions for ion exchange, shortens the distance of ion diffusion, but also increases many chain link active centers, which are generated by van de Waals force between molecules. Molecular adsorption can adsorb various non-ionic substances like activated carbon and expand its function. Some macroporous resins without exchange functional groups can also adsorb and separate a variety of substances, such as phenols in chemical plant wastewater.

The pores inside the macroporous resin are large and large, the surface area is large, the active center is large, the ion diffusion rate is fast, and the ion exchange rate is also much faster, about ten times faster than the gel-type resin. It has fast action and high efficiency when used, and shortens the processing time required. Macroporous resin also has many advantages: resistance to swelling, resistance to cracking, oxidation resistance, abrasion resistance, heat resistance and temperature change resistance, and easier adsorption and exchange of organic macromolecular substances, so it has strong anti-pollution power and is more Easy to regenerate.

C100E ion exchange resin

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