METHOD OF PRODUCING CARBOXYMETHYL CHITOSAN Russian patent published in 2024 - IPC C08B37/08 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to production of chitosan derivatives. Method of producing carboxymethyl chitosan involves treating an aqueous solution of chitosan with sodium chloroacetate and, if necessary, sodium hydroxide. Treatment is carried out at a chitosan concentration of 18–25 wt.% and a molar ratio of sodium chloroacetate: chitosan: sodium hydroxide of 1–2: 1: 0–1 at 60–70 °C for 22–26 hours. Then washed with water, sodium hydroxide solution and dried at 60–70 °C to constant weight.

EFFECT: invention enables to obtain carboxymethyl chitosan with degree of modification 0.6–1.7.

1 cl, 5 ex