Dialysis membrane of cellulose in the shape of a hollow fiber, a

Details Dialysis membrane of cellulose in the shape of a hollow fiber, a Dialysis membrane of cellulose in the shape of a hollow fiber, a

1985-01-11

1990-06-12

Fisher, Richard V.

Liquid purification or separation

Filter

Material

21032173, 21050029, 428374, 428398, 428399, B01D 1301

Patent

active

049330845

ABSTRACT:
Dialysis membranes are disclosed, in the shape of hollow fibers composed of cellulose regenerated from copper-ammonia solution, having a continuous hollow cavity and a closed wall, wherein in any cross-section normal to the direction of the fiber axis the difference of the distance to the outer wall surface and the distance to the inner wall surface, each measured from the fiber midpoint, varies along the periphery, the fiber midpoint being the midpoint of the circle circumscribing the fiber cross-section, and the cross-section normal to the direction of the fiber axis possessing the shape of a circle, a deformed circle, an ellipse, a kidney-shaped deformed ellipse, or a deformed quadrangle. In one particular embodiment, the wall thickness of the hollow fiber along its periphery at least once continuously increases to a maximum thickness and decreases to a minimum thickness, the respective maximum and minimum thicknesses being spaced approximately equally about the periphery, with all portions of maximum thickness having the same maximum thickness and all portions of minimum thickness having the same minimum thickness.

REFERENCES:
patent: 3700545 (1972-10-01), Matsui et al.
patent: 3704223 (1972-11-01), Dietzsch et al.
patent: 3737043 (1973-06-01), Clark
patent: 3742946 (1973-07-01), Grossman
patent: 3772137 (1973-11-01), Tolliver
patent: 3888771 (1975-06-01), Isuge et al.
patent: 4164437 (1979-08-01), Henne et al.
patent: 4175153 (1979-11-01), Dobo et al.
patent: 4176069 (1979-11-01), Metz et al.
patent: 4222869 (1980-09-01), Kato
Cuprophan Technical Information Bulletin, No. 12, 9/1976, Enka Glanzstoff AG, Wuppertal Barmen, P.O. Box 200916, W. Germany.

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