Porous polysulfone membrane and process for producing the same

Details Porous polysulfone membrane and process for producing the same Porous polysulfone membrane and process for producing the same

B - Operations, Transporting

01

D

B01D 71/68 (2006.01) B01D 61/14 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 69/08 (2006.01)

Patent

CA 2192351

The present invention relates to a polysufone porous membrane having a high water flux, an excellent resistance to moist heat and an excellent repercolation characteristic, and which comprises a mixed polymer having polyallylsulfone and polyethersulfone at a ratio of from 9/1-1/9 (by weight), the membrane being a graded porous membrane forming a cross-linked polymer network wherein a number of micropores being interconnected from one surface to the other surface,and the membrane comprising two layers wherein one layer being a dense layer having a number of pores with pore sizes in the range of 0.01-1µm and therebyhaving a separation function, and the other layer being a graded type supportinglayer supporting said dense layer and having a pore size distribution wherein the pores existing therein and having sizes of 1-100µm increase continuously from the dense layer side toward the other surface side, wherein the separation particle size is not larger than 0.5µm, and a method of manufacturing the same.

Membrane poreuse à base de polysulfone possédant une vitesse de perméation élevée et une excellente résistance à la chaleur humide et supportant une hydroperméation répétée. Cette membrane est produite à partir d'un polymère mélangé, composé d'un sulfone de polyaryle et d'un sulfone de polyéther dans un rapport pondéral allant de 9/1 à 1/9 et comporte une structure de réseau polymère dans laquelle de nombreux pores fins vont d'une surface à l'autre de la membrane. Cette dernière se compose d'une dense couche contenant de nombreux pores de diamètres compris entre 0,01 et 1 µm et ayant une fonction de séparation, et d'une couche de support à gradient qui supporte la couche dense et contient des pores de diamètres compris entre 1 et 100 µm, de sorte que chaque diamètre de pore augmente en continu dans le sens allant du côté couche dense à l'autre côté et le diamètre de particules de fractionnement de la membrane est égal ou inférieur à 0,5 µm.

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