FIELD: chemistry.
SUBSTANCE: in the method of the invention, xylan sulfate is obtained by sulfating xylan with sulfamic acid in N,N-dimethylformamide. In N,N-dimethylformamide, with stirring, sulfamic acid, urea, xylan are added and kept with stirring at a temperature of 100°C for 0.5-6.0 h. The resulting reaction mass is neutralised with a 3% aqueous solution of sodium hydroxide and concentrated in vacuo until the solvent is completely removed. Then, the dry residue is dissolved in distilled water and filtered. The obtained filtrate is purified by dialysis. The aqueous solution of the sodium salt of xylan sulfate is concentrated in vacuo until the water is completely removed.
EFFECT: increased method efficiency.
7 ex, 1 tbl
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