Integrity-testable wet-dry-reversible ultra-filtration...

B - Operations – Transporting – 01 – D

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B01D 69/02 (2006.01) B01D 65/10 (2006.01) B01D 67/00 (2006.01) G01N 15/08 (2006.01)

Patent

CA 2077490

The present invention provides an ultrafiltration/diafiltration polymeric membrane that is capable of excluding O. 1 µm diameter, monodisperse, latex particles with a rejection coefficient greater than 0. 998 and is capable of being fully dried without loss of such ultrafiltration properties and which after being wet/dry cycled at least once will have a KUF f low rate at 10 psi, using 1-butanol saturated with water as the wetting liquid and water saturated with 1-butanol as the displacing liquid at ambient temperature, below 50 cc/min per square foot of membrane area. The present invention also provides a method of filtering a fluid through the present inventive ultrafiltration membrane, as well as a process of preparing the present inventive ultrafiltration membrane .

La présente invention a trait à une membrane d'ultrafiltration-diafiltration capable de retenir des particules de latex monodispersées de 0,1 micromètre de diamètre avec un coefficient de rejet supérieur à 0,998, et capable de sécher sans perdre ses propriétés d'ultrafiltration et qui, après avoir été déshydratées par voie humide, présentent un débit KUF de 10 livres par pouce carré, en utilisant du 1-butanol saturé d'eau comme liquide de mouillage et de l'eau saturée de 1-butanol comme liquide dispersant, à température ambiante, à une vitesse inférieure à 55 centimètres cubes à la minute par pied carré de surface de membrane. La présente invention a également trait à une méthode de filtration d'un fluide au moyen de la membrane d'ultrafiltration visée par l'invention, ainsi qu'à un procédé de préparation de cette membrane d'ultrafiltration.

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