Methods for preparing anisotropic hollow fiber membranes compris

Details Methods for preparing anisotropic hollow fiber membranes compris Methods for preparing anisotropic hollow fiber membranes compris

1980-02-20

1982-12-21

Cannon, James C.

Gas separation

Two or more separators

Plies or layers of different characteristics or orientation

55 16, 55 69, 55 70, 55 73, 55158, 55524, 55528, 2105002, 264 41, 264178F, 264182, 2642091, 264344, 428398, B01D 5322, B29D 2704, B32B 320, D01F 618

Patent

active

043647596

ABSTRACT:
Anisotropic hollow fiber membranes comprising polymer of acrylonitrile and styrene are prepared by extruding a solution of a hollow fiber-forming polymer comprising polymer of acrylonitrile and styrene in a liquid carrier through an annular spinnerette to form a hollow fiber precursor, and the hollow fiber precursor is coagulated in a liquid coagulant comprising water to form a hollow fiber membrane. The liquid carrier used in the method comprises N,N-dimethylformamide and preferably contains non-solvent for the polymer of acrylonitrile and styrene. The hollow fiber membranes have a homogeneously-formed thin selective skin on an open cellular support and exhibit high resistance to collapse. The membranes are especially useful for the separation of gases.

REFERENCES:
patent: 3615024 (1971-10-01), Michaels
patent: 3674628 (1972-07-01), Fabre
patent: 3871950 (1975-03-01), Hashino et al.
patent: 3930105 (1975-12-01), Christen et al.
patent: 3950257 (1976-04-01), Ishii
patent: 3975478 (1976-08-01), Leonard
patent: 4025439 (1977-05-01), Kamada et al.
patent: 4177150 (1979-12-01), Inoue et al.
Strathmann et al., "The Formation Mechanism of Assymmetric Reverse Osmosis Membranes", 4th International Symposium on Fresh Water From the Sea, vol. 4 (1973) 381-394.
Davis et al., Desalinisation, vol. 22 (1977) 221-227.
Cabasso et al., Journal of Applied Polymer Science, vol. 23 (1979) 1509-1525.

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