METHOD OF PRODUCING MEMBRANE TUBULAR FILTERING MEMBERS Russian patent published in 2002 - IPC

FIELD: methods of producing membrane tubular filtering members; applicable in ultra- and microfiltration for concentration, separation and purification of compounds. SUBSTANCE: method consists in formation on open porous tube surface of liquid film from homogeneous solution containing, mas.%: fluoroplastic, 8-25; nonsolvent, 20-40; solvent, the balance, and hardening of fluoroplastic. Nonsolvent is used in the form of, mas.%: lower aliphatic alcohol, 25-33; or its mixture with acetic (by mass), 1.0:0.4-1.5; or with polyvinylpyrrolidone, 1:0.016-0.180; or with acetic acid and polyvinylpyrrolidone, simultaneously, 1:(0.5-1.5):(0.015-0.025). Invention provides for increase of viscosity, stability and other properties of fluoroplastic solutions required for production of tubular filtering members. EFFECT: extended assortment and raw material base for production of tubular filtering members. 1 tbl, 15 ex