Multi-layer microfiltration membrane having an integrated prefil

Details Multi-layer microfiltration membrane having an integrated prefil Multi-layer microfiltration membrane having an integrated prefil

1995-06-23

1997-04-15

Cannon, James C.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

21050027, 21050029, 2105003, 21050031, 21050032, 21050041, 21050042, 210504, 210506, 2105101, 4283166, B01D 6912, B01D 7106, B01D 7116, B01D 7168

Patent

active

056207905

ABSTRACT:
A multi-layer microfiltration membrane having an integrated prefiltration layer. Pursuant to a phase inversion process, several layers are successively poured out onto one another prior to phase separation of a lower layer, with the viscosity for the pour solution decreasing toward the upper layers. This produces a microporous, multi-layer, integral filtration membrane having a homogenous symmetrical pore structure for the final filtration layer and an open-pored structure for the prefiltration layer disposed therebelow. Even with small pore diameters, this membrane can be easily pleated for installation in filter cartridges without the formation of damage at the crease edges. High throughput rates are possible at a low tendency to clog.

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patent: 5240615 (1993-08-01), Fishman
patent: 5500167 (1996-03-01), Degen
Eberhard Staude; Membranen und Membranprozesse; 1992; p. 10.
Robert Kesting; Synthetic Polymeric Membranes; 1985; p. 237.

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