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Phosphorus-containing chelating resin

 Last Update: 2022-01-01
 Source: Internet
 Author: User

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citric acid solution

aqueous nitric acid

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Phosphonic acid resin is a medium-strong acid cation exchange resin

The synthesis method of amino phosphonic acid resin is as follows

The resin containing primary amino groups reacts with acetaldehyde to generate Schiff base, which is then co-heated with diethyl hydrogen phosphonate at 100°C to obtain a chelating resin with a-amino phosphonate group:

Using primary amine resin, aqueous formaldehyde solution and phosphorous acid as raw materials, using water as the reaction medium, Mannich reaction was carried out under the catalysis of hydrochloric acid to synthesize this type of resin

In another example, in a three-necked flask equipped with a stirrer, styrene-divinylbenzene copolymer beads, primary amine balls, phosphorous acid aqueous solution, and hydrochloric acid are added, and formaldehyde solution is added dropwise at a certain temperature

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