• 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 ...

• 2021-09-30

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...

• 2022-06-21

In addition to conventional ion exchange resins, micron fine-grained ion exchange resins are also developing rapidly. This kind of resin is mainly used for chromatographic separation. Therefore, a sufficiently small particle size (100~400 mesh) and a relatively narrow particle size distribution are key technical indicators. Suspension polymerization can prepare spheres with diameters ranging from ...

• 2022-10-24

Anion exchange resins produced in industry are mostly made of styrene divinylbenzene copolymer spheres as the skeleton, and introduced quaternary ammonium groups or other amine groups through chloromethylation and amination. Its varieties and specifications are far more than those of cation exchange resin. Therefore, it is widely used and one of the main strains of ion exchange resin. The basic sy...

• 2022-10-25

Under the action of catalyst, chloromethylation of chloromethyl ether and polystyrene is easy to proceed. The reaction rate depends on the nature, amount and temperature of catalyst. When ZnCl2 is used as catalyst, the reaction rate constant is proportional to the amount of ZnCl2 used. For AICl3 and SnCl4, the logarithm of the reaction rate constant is proportional to its dosage. It can be seen th...

• 2022-10-26

2. Synthesis of strong basic anion exchange resin Among anion exchange resins, the yield of quaternary ammonium based strong alkaline resin is the largest. The main variety is gel type resin containing one N+(CH3) 3, with a crosslinking degree of 7 or 8, called strong base type I. Another ion exchange resin containing one N+(CH3) 2CH2CH2OH group is called strong base II. Strong basic anion exchang...

• 2022-10-31

3. Synthesis of weakly basic anion exchange resin Chloromethylstyrene divinylbenzene copolymer can be aminated with many amines, and the aminated product with primary amine and secondary amine is weak base anion exchange resin. The hydration ability of weak base group is slightly poor, and the expansion in alkaline solution is also small, so the amination reaction can be faster. Especially, the ma...

• 2022-11-04

3、 Anion exchange resin There are two main routes for the synthesis of polycondensation anion exchange resin, one is the polycondensation of aromatic amines or aromatic amines and fatty polyamines with formaldehyde; The other is polycondensation of polyamine and epichlorohydrin. The hydrochloric acid solution of m-phenylenediamine and formaldehyde is dispersed and suspended in the mixed medium of ...

• 2022-11-29

1. Quartz sand cushion is in disorder. When the quartz sand cushion is selected at the bottom of the exchanger, the quartz sand layer will be caked due to improper backwashing operation or fouling; If the backwash water is flushed out locally, the quartz sand cushion will be disordered. The center of the dome shaped perforated plate under the quartz sand cushion shall not be perforated, so as to p...