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    Home > Chemicals Industry > Chemical Technology > Preparation example of N, O ligand chelating resin (2)

    Preparation example of N, O ligand chelating resin (2)

    • Last Update: 2022-01-01
    • Source: Internet
    • Author: User
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    (5) Example 5

    Take 80 g of styrene-divinyl copolymer pellets after chloromethylated amine, add 160 mL of ethanol and 16 mL of dichloroethane to mix


    Firstly, 8-hydroxyquinoline is chloromethylated, and then reacted with primary amine resin at 100°C for 10 hours to obtain spherical chelating resin


    Using 5-chloromethyl-8 quinolinol, under the catalysis of SnCl 4 and macroporous cross-linked polystyrene for Friedel-Crafts reaction, 8-quinolinol resin can be obtained


    US patent US 3886080 discloses a preparation method of 8-hydroxyquinoline ion chelating resin that can be used to remove multiple heavy metal ions in wastewater and enrich trace metal ions


    Chinese patent CN200510044986.


    Schiff base resins are also a type of N, O ligand chelating resins, which are basically formed by the condensation of primary amines and aldehydes.


    ①Condensation reaction The condensation reaction of dialdehyde and diamine can obtain a polymer chelate with Schiff base on the main chain


    ②Starting from polystyrene, through polymer reaction, a chelating polymer whose side group is Schiff base is generated


    ③Synthesize acrylamide derivatives and conduct free radical polymerization to obtain polymers containing chelating groups


    For example, 2,5-dihydroxyterephthalaldehyde and diamine are refluxed in glacial acetic acid for 16 hours to obtain a polymer with the following structure


    Take 15g of macroporous benzylamine resin after fully swelling, add to pH=10 Na 2 CO 3 -NaHCO 3 buffer solution, heat up to (30±2) ℃, add 8.


    For another example, at room temperature and under constant stirring, gradually add refined chitosan to the mixture of acetic acid and methanol until it is completely dissolved, then slowly add the measured salicylaldehyde dropwise, and adjust with glacial acetic acid or sodium hydroxide The pH value is about 4.


    Related links: Preparation examples of N, O ligand chelating resins (1)

     

     

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