FIELD: chemical technology, separation of substances. SUBSTANCE: solution of cellulose acetate is formed on the porous backing. Membrane prepared is thermally treated at 50-60 C. Cellulose acetate of the following chemical formula is used [C6H7O2(OCOCH3)x(OH)y(OSO3H)z]n, where X = 2.49-2.61; y = 0.384; z = 0.003-0.06; n = 190-230. EFFECT: improved method of membrane making. 3 tbl
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