Synthesis of special ion exchange resin(I)
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 kind of resin that can conduct electron exchange with surrounding active substances and have redox reaction, also known as electron exchange resin. The most common ones are hydroquinones, sulfhydryl groups, pyridines, ferrocene, etc. Hydroquinones can be prepared by condensation polymerization or vinyl hydroquinone polymerization. However, the active hydrogen of hydroquinone makes it possible to participate in polycondensation or polymerization, so it is always protected. The disadvantage of this method is that the preparation of monomer is troublesome, and the hydrolysis of the latter reaction is also difficult. A variety of redox resins can also be prepared by the reaction of chloromethyl polystyrene with hydroquinone.
Examples of pyridine redox resins are: cross polystyrene containing nicotinamide. This kind of resin has been used in practice, and its synthesis methods have also been studied in many aspects. In addition to the above methods, vinyl benzyl nicotinamide is synthesized first, and then the resin with the same structure can be obtained through polymerization.
Ion exchange resin adsorption is a simple and convenient method to prepare redox resin. Many organic or inorganic redox agents can be loaded onto appropriate ion exchange resins to make redox resins, such as Cu2+, Fe2+, Sn2+, Co2+Ce3+, Ni2+, Mn2+, etc. If these ions are bound to the resin in the form of complex, its stability is better.
Organic redox agents, such as a variety of acid or alkaline dyes, hydroquinone, anthraquinone, tetrachlorohydroquinone, indigo disulfate, etc. can also be adsorbed on anion or cation exchange resins to make redox resins.
The redox resin can be used to prepare hydrogen peroxide, as an oxidant for dehydrogenation reaction, to remove oxygen from high-pressure boiler water and as an antioxidant, etc. It can also be used in many aspects such as environmental protection analysis.
English
