FIELD: production of asymmetric polymeric pervaporation membranes; may be used in chemical, petrochemical and other industries for separating mixtures of organic liquids containing aliphatic alcohols. SUBSTANCE: membrane is formed from polyamidoimide with structural formula given in the invention description, reduced viscosity of 2.5-3.5 dl/g (0.5-% solution in N-methylpyrrolidone, at 20 C), molecular weight of 80-100,000. Membrane comprises interconnected nonporous working diffusion layer-skin of 0.05-0.6 mcm thickness and sublayer made of the same polymer with average size of pore diameter 50-60 nm. Total thickness of membrane is 70-250 mcm. EFFECT: increased membrane productivity by more than one order with its higher selectivity and permeability. 5 tbl
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