FIELD: cellulose derivatives. SUBSTANCE: after termination of synthesis, product is isolated from reaction mixture by filtration followed by washing with water under dialysis filtration conditions with repetition factor 7-8 on polymer membranes characterizing by selectivity 97-99% for proteins with molecular weight 20000. Process is conducted at 20-25 C and pressure from 0.1 to 0.7 MPa. Product is then concentrated to desired content of water-soluble cellulose sulfoacetete. EFFECT: improved product purity. 2 cl, 2 dwg, 1 tbl, 3 ex
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