Method for producing highly permeable acrylic hollow fibers

Details Method for producing highly permeable acrylic hollow fibers Method for producing highly permeable acrylic hollow fibers

1974-08-14

1976-08-17

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

210500M, 264177F, 264182, 264206, 264209, 428398, B29D 2700, D01F 618

Patent

active

039754782

ABSTRACT:
A method is provided for fabricating asymmetric acrylic hollow fibers for use in separatory processes as a selective membrane. The fibers are highly permeable and exhibit a high degree of selectivity in discriminating mixtures into their various components. The fibers are formed by extruding an acrylic polymer solution through an annular orifice while simultaneously injecting a coagulating fluid into the bore of the fiber extrudate as it is formed. The extrusion may be directly into a coagulating bath maintained at a temperature of from 60.degree. to 80.degree.C. or alternatively the freshly extruded fiber may be first passed through an air space (evaporation zone) and thence into the coagulating bath. Following coagulation, the fibers are water washed to remove residual solvent.

REFERENCES:
patent: 3674628 (1972-07-01), Fabre
patent: 3799356 (1974-03-01), Salyer et al.

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