• 2021-04-26

Ion exchange resin is a kind of insoluble polymer compound with functional group (active group of ion exchange), network structure, which  is also a kind of polymer that acts as a medium for ion exchange. Ion exchange resin provids a large surface area on and inside them, and the capture of ions is accompanied by the release of other ions, so this process is called ion exchange. According to ...

• 2021-06-08

In the electronic industry, from the cleaning of various electronic components to the preparation of a series of process solutions, high-quality pure water is needed, especially in the production of semiconductor devices and large-scale integrated circuits. Almost every process needs to be cleaned with ultrapure water. Ultra pure water plays an increasingly important role in the electronic industr...

• 2021-09-30

Chemical desalination refers to the process in which various ions contained in water are removed by ion exchange reaction with ion exchange resin, also known as ion exchange demineralized water treatment. When various cations in the water react with the cation exchange resin, the water contains only hydrogen ions exchanged from the cation resin; After various anions in water react with anion excha...

• 2021-10-11

(1) The cation exchanger is located in front of the anion exchanger. The reasons are as follows: a. the exchange capacity of strong base anion exchange resin is low, and the ion exchange reaction efficiency of strong base anion resin in acidic water (H-type cation resin exchange water) is high, and the working exchange capacity can be fully utilized. b. After the raw water is exchanged by H-type c...

• 2021-11-01

The chemical desalting system is selected according to the raw water quality and effluent requirements through technical and economic comparison. A chemical desalination system is usually composed of some units. For example, the common primary chemical desalination system is composed of three units: cation exchange unit, decarbonization (carbon dioxide removal) unit and anion exchange unit. Each i...

• 2022-02-18

The exchange reaction of the ion exchange resin is similar to the replacement reaction in the solution. The exchangeable ions carried by the functional groups immobilized on the polymer backbone can be dissociated in the aqueous solution. For example, the hydrogen ions can be dissociated from the sulfonic acid resin. Such ions can move freely over a wide range and diffuse into the solution. At the...

• 2022-03-10

Application of ion exchange resin 1、 Water treatment The amount used for water treatment is large, accounting for more than 90% of the output of ion exchange resin. There are divalent calcium, magnesium ions and trivalent iron ions in industrial water, which is easy to scale pipelines and boilers. The process of removing these metal ions is called water softening. The early softening of water was ...

• 2022-10-17

Strong acid cation exchange resin is made by sulfonation reaction, introducing sulfonic group into the benzene ring of cross-linked polystyrene. The sulfonation of aromatic rings is a typical electrophilic substitution reaction. In addition to concentrated sulfuric acid and chlorosulfonic acid, sulfur trioxide and oleum can also be used as sulfonating agents. Therefore, in addition to our most com...

• 2022-10-19

2. Composition of crosslinking agent The common crosslinking agent of cation exchange resin is divinylbenzene. The isomer of the crosslinking agent divinylbenzene has a great influence on the structure of the copolymer, so it can significantly affect the rate of sulfonation reaction. The effect of the amount of divinylbenzene on the sulfonation rate of the copolymer is very clear, but the effect o...

• 2022-10-20

4. Swelling agent In industry, dichloroethane is used as swelling agent to prepare strong acid cation exchange resin, but this is not the best choice. Dichloroethane cannot be miscible with sulfuric acid, and the diffusion of sulfuric acid into the resin becomes the control factor of sulfonation rate. Dimethyl sulfoxide can be miscible with sulfuric acid, which is conducive to the diffusion of sul...

• 2022-11-02

The preparation of ion exchange resin by polycondensation is the earliest method to synthesize organic ion exchanger. Although most of the ion exchange resins produced today are additive type functionalized copolymers, the polycondensation method is still very useful. Some polycondensation ion exchangers are still widely used. The early polycondensation resin was made into block polymer by bulk po...

• 2022-11-03

2、 Weak acid cation exchange resin The carboxylic acid type cation exchange resin was first synthesized by condensation polymerization of 3,5-dihydroxybenzoic acid and formaldehyde. The exchange capacity of this resin can reach about 7 meq/g. Dissolve 20g of 2,4-dihydroxybenzoic acid in alkaline water, add 10g of sodium chloride and 6g of phenol, then place them in ice salt water for cooling, add ...