METHOD OF PRODUCING N, S-CONTAINING, CHITOSAN-BASED POLYMER

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FIELD : chemistry. SUBSTANCE : present invention relates to a method of producing a N, S-cyclo-containing chitosan derivative. Described is a method of producing a chitosan-based N, S-cyclo-containing polymer (I) which contains in the macrochain 1-oxa-6-thia-4, 8-diazocycloundecane fragments : I, by reacting chitosan with formaldehyde and a S-containing compound, characterised by that the S-containing compound used is hydrogen sulphide, the formaldehyde solution is pre-saturated with H2S and the reaction is carried out with molar ratio chitosan : formaldehyde : hydrogen sulphide of 1 : 2 : 1, at temperature of 0-60°C in a chloride medium for 24 hours. EFFECT : obtaining modified chitosan which exhibits properties of a highly efficient heavy metal sorbent for waste water treatment, an extractant for separating rare, noble and precious metals and a complexing agent for biological molecules. 1 tbl, 3 ex