• 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...

• 2022-11-01

Acrylic ion exchange resin has the advantages of high exchange capacity and good resistance to organic pollution. It is widely used and its output is only inferior to that of styrene resin. Its main variety is weak acid ion exchange resin with carboxyl group. There are also many varieties and specifications of weakly alkaline and strongly alkaline resins with amide structure. This kind of anion ex...

• 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 ...

• 2022-11-03

Ion exchange resin has been widely used in pharmaceutics, but its development also has its limitations. Time is proving the safety of drug lipid complex in the drug domain. The advantages of ion exchange resin will undoubtedly promote the continuous progress of ion exchange resin technology. Of course, today is mainly about the role of ion exchange resin in pharmacy. 1. Mask one's taste The ion ex...

• 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 ...

• 2022-11-04

The desalination principle of ion exchange resin is the process in which the ion exchange resin separates the salt from the solution: the metal cations (Na+, Ca2+, K+, Mg2+, Fe3+, etc.) contained in the aqueous solution in the action environment of the ion exchange resin are exchanged with the H+on the cation exchange resin (containing acidic groups such as sulfonic acid group (- SO3H), carboxylic...

• 2022-11-07

Chelating resin is a kind of cross-linked functional polymer material which can form multi coordination complex with metal ions. In its functional group, there are O, NSP, As and other atoms with unlinked lone pair electrons. These atoms can form coordination bonds with metals as a pair of lone pair electrons, forming stable structures similar to small molecule chelates. The dissociatable parts of...

• 2022-11-08

This kind of resin refers to some ion exchange resins that have special uses in some occasions, but are not large enough in production and application, are still developing or under research in technology, and need to be improved. Because its synthesis method is similar to that of common ion exchange resin, this section will only give a brief introduction. 1、 Redox resin Redox resin refers to a ki...

• 2022-11-09

2、 Amphoteric resin Amphoteric resin is a kind of ion exchange resin with cation and anion groups in the same resin particle. The two groups in this kind of resin are close to each other, which can combine with each other to meet the ions in the solution, and can exchange ions with cation and anion at the same time. After saturation, only a large amount of water washing is needed to regenerate the...