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[Preparation method] Carboxymethyl chitosan is not sensitive to hydrolysis reaction and has the properties of amphoteric polyelectrolyte
In addition, taking advantage of the nature of the reaction of amino groups and aldehyde groups to generate Schiff bases, selecting aldehydes with hydrophilic groups such as carboxyl and hydroxyl groups in the molecular structure can also achieve carboxymethylation.
Take 15g of chitosan and add 35mL of 50% NaOH solution, 150mL of isopropanol, basify in a three-necked flask for 8h, then add 18g of chloroacetic acid , react for 2h, warm to 65℃, react for 2h, stop heating, adjust pH with glacial acetic acid To neutrality, after filtering, wash the filter cake with 70% methanol several times, and then repeatedly wash with absolute ethanol at 60°C and dry to obtain carboxymethyl chitosan
②Example 2
10g powder of chitosan, 15mL of isopropanol, soak for 1-2h, add 25mL of 30% NaOH solution, heat in a water bath, dissolve 6g of chloroacetic acid in 20mL of isopropanol , add dropwise to the reactor under stirring, and react for a certain period of time
③Example 3
The synthesis of carboxymethyl chitosan from chitosan can be divided into the following steps: swelling, alkalization, carboxymethylation, and purification
④Example 4
Carboxymethyl chitosan is synthesized using chitin as raw material.
⑤Example 5
Synthesis of carboxymethyl chitosan under microwave action
[Application] Application in printing and dyeing wastewater treatment: Use carboxymethyl chitosan flocculant to treat 5 kinds of water-soluble dye wastewater, namely: Reactive Brilliant Blue X-BR, Direct Light Fast Turquoise Blue GL, Acid Scarlet 3R, Cationic pink FG, Auramine O
Table 3-87 Treatment effect of carboxymethyl chitosan on dye wastewater
Carboxymethyl chitosan derivatives have excellent solubility in water, and have film-forming, thickening, moisturizing, flocculating and chelating properties
Related links: Wastewater treatment with lignosulfonate modified flocculant LSDC (2)