What are the basic types of ion exchange resins?

　　There are many kinds of softening resins. Because of their different chemical composition and structure, they have different properties and properties and are suitable for different applications. Ion exchange resin is composed of classification name, skeleton (or gene) name and basic name. The pore structure is divided into two types: gel type and large pore type. All macroporous resins with physical pore structure are added "big hole" before the full name. If the classification is acidic, the word "yang" should be added before the name, while the classification is alkaline, and the word "yin" should be added before the name. Such as: macroporous strong acidic styrene cation exchange resin. Ultra-pure water-matched resin should be selected according to process requirements and material properties.

　　(1) Strong acidic cationic resin

　　This resin contains a large number of strong acidic groups, such as sulfonic acid-SO3H. It is easy to separate H~+ from solution, so it is strong acidic. After resin dissociation, the negative ions (such as SO3-) contained in the body can adsorb other cations in the solution. These two reactions result in the exchange of H + in the resin with cations in the solution. Strong acidic resin has strong dissociation ability and can exchange ion in acidic or alkaline solution.

　　After the resin is used for a period of time, the resin should be regenerated, that is, the ion exchange reaction takes place in the opposite direction with the chemical agent, so that the functional groups of the resin can be restored to their original state. Ion exchange resins can be divided into styrene resin and acrylic resin according to their matrix types. The main properties and types of resins are determined by the types of chemical active groups in resins. Firstly, it can be divided into cationic resins and anionic resins, which can exchange ions with cations and anions in solution respectively. Cationic resins can be divided into strong acidity and weak acidity. Anionic resins can be divided into strong alkalinity and weak alkalinity. For reuse. If the cationic resin is regenerated with strong acid, the resin releases the adsorbed cations and then binds with H + to restore the original composition.

　　(2) Weak acidic cationic resin

　　Containing weak acidic groups, such as carboxyl-COOH, they can separate H+ from water and become acidic. Residual anions after resin dissociation, such as R-COO-(R is a hydrocarbon group), can be adsorbed with other cations in solution to form cation exchange. The resin has weak acidity and is difficult to dissociate and exchange ions at low pH. It can only be used in alkaline, neutral or slightly acidic solutions (e.g. PH5-14). These resins are also regenerated with acid (which is easier to regenerate than strong acidic resins).

　　(3) Strong basic anion resin

　　Containing strong alkaline groups, such as quaternary amino group (also known as quaternary amino group) - NR3OH (R is alkyl group) can dissociate OH-, showing strong alkalinity in water. Ion exchange resins can be divided into styrene resin and acrylic resin according to their matrix types. The main properties and types of resins are determined by the types of chemical active groups in resins. Firstly, it can be divided into cationic resins and anionic resins, which can exchange ions with cations and anions in solution respectively. Cationic resins can be divided into strong acidity and weak acidity. Anionic resins can be divided into strong alkalinity and weak alkalinity. The positive group of the resin can be adsorbed with anions in the solution, resulting in anion exchange. resin

　　It has strong dissociation and works normally under different pH conditions. It is regenerated from strong alkali such as NaOH.

　　C100E gel ion exchange resin is mainly used in the preparation of softened water, pure water and high purity water, sewage treatment, pharmaceutical purification water, chemical catalysis and so on. It also has applications in the separation of rare metals.