Method of making a hollow fibre membrane

Details Method of making a hollow fibre membrane Method of making a hollow fibre membrane

1996-06-06

1998-11-10

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264184, 2642091, 26421114, 26421117, D01D 524, D01D 5247

Patent

active

058338969

ABSTRACT:
A method of making a hollow fiber membrane comprises extruding a membrane-forming polymer solution through the annulus of a tube-in-orifice spinneret (12) to form a nascent hollow membrane (32), there being a lumen coagulant in the lumen of the nascent membrane, and the outside of the nascent membrane being contacted with an external coagulant (34). The external coagulant has a solvent content which is such that, at the interface between the nascent membrane and the external coagulant, liquid--liquid phase separation rather than gelation is thermodynamically the favored process, and the membrane is then subjected to a vapor-phase non-solvent environment to induce precipitation of the phase-separated polymer.

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Journal of Membrane Science, vol. 98, No. 3, 31 Jan. 1995, Amsterdam, NL, pp. 191-200, M.J. Han et al: "Changes in morphology and transport characteristics of polysulfone membranes prepared by different demixing condition".
Myeong-Jin Han et al. "Changes in morphology and transport characteristics of polysulfone membranes prepared by different demixing conditions" Journal of Membrane Science 98 (1995) pp. 191-200.

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