Asymmetric membranes and process therefor

Details Asymmetric membranes and process therefor Asymmetric membranes and process therefor

B - Operations, Transporting

01

D

117/88.5

B01D 65/10 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01)

Patent

CA 1202837

IMPROVED ASYMMETRIC MEMBRANES AND PROCESS THEREFOR ABSTRACT OF THE DISCLOSURE: There is disclosed, in one aspect, an improved highly asymmetric membrane comprising a skin and a porous asymmetric support. The skin contains pores which have an average pore diameter from about 0.005 to about 3.0 microns and this asymmetric support comprises a reticulated structure which con- tains pores which have pore diameters of from about 10 to about 20,000 times as large as the average pore diameter of the pores of the skin. The membrane has a bulk porosity greater than about 70%. In another aspect, there is disclosed a process for prepar- ing these membranes. This process comprises casting a polymer dope while the dope is in an unstable liquid dispersion condition. The concentration of polymer in the polymer dope should be high enough to produce a coherent membrane yet low enough to form a substantially all-reticulated structure within the asymmetric support. The membranes are characterized by high flow rates, excellent retention properties, and improved resistance to fouling

372460

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