Method of manufacturing a unit assembly of filter membranes, a m

Details Method of manufacturing a unit assembly of filter membranes, a m Method of manufacturing a unit assembly of filter membranes, a m

1989-12-11

1991-04-09

Spear, Frank

Liquid purification or separation

Casing divided by membrane into sections having inlet

Cylindrical membrane

210496, 21050027, 264 466, B01D 6700

Patent

active

050062298

ABSTRACT:
A method of manufacturing a unit assembly of filter membranes obtained by precipitating a polymer solution, comprises the following steps: a plurality of elongate porous elements are placed in an outer shell having a closed end and an open end, the elongate elements passing through said closed end and having longitudinal axes which are parallel to one another and to the direction extending between the two ends; injecting the polymer solution around the porous elements; injecting a fluid into one end of the elements, the fluid diffusing through the elements towards the polymer; and removing the polymer solvent which diffuses in the opposite direction from the other ends of the elements, thereby causing the polymer to precipitate and form a porous polymer structure around the porous elements and between them, with the porous structure having in contact with the porous elements a skin of adjustable porosity then removing the porous elements in order to unmold a porous polymer block pierced by channels whose longitudinal axes are parallel to one another. The invention also provides the resulting unit filter assembly, and mold for use in manufacturing it.

REFERENCES:
patent: 3381999 (1968-05-01), Steere, Jr.
patent: 4032454 (1977-06-01), Hoover et al.

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