ASYMMETRICAL POLYMERIC FIRST-MEMBRANE POLYIMIDE-BASED MEMBRANE FOR SEPARATION OF COMPONENTS OF DIFFERENT POLARITY OF LIQUID MIXTURES AND FOR DESALTING Russian patent published in 2019 - IPC B01D71/64 

FIELD: chemistry.

SUBSTANCE: invention relates to the field of the chemistry of high-molecular compounds. Asymmetric polyimide polymer membrane on the basis of polyimide for separation of components of different polarity of liquid mixtures and for desalting consists of non-porous working selective diffusion layer formed from copolyimide with link formula:

,

n:m=0.25–10, or its salt form with triethylammonium ions, alkali and / or alkali-earth metals, or its cross-linked aromatic diamine form, nanoporous sublayer and microporous substrate, together comprising an ultrafiltration membrane substrate made from the same copolyimide, salt or cross-linked forms thereof or other polymer used to make ultrafiltration membranes, thickness of the working layer is 0.01–5 mcm, thickness of sublayer is 1–30 mcm, total thickness of membrane is 120–300 mcm, average pore diameter of sublayer is 3–60 nm, average diameter of the pores of substrate is 5–8 mcm.

EFFECT: obtained membranes are capable of separating mixtures in a wide range of concentration.

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где - where