Asymmetric porous polyamide membranes

Details Asymmetric porous polyamide membranes Asymmetric porous polyamide membranes

B - Operations, Transporting

01

D

18/15, 18/785, 1

B01D 63/12 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 69/08 (2006.01) B01D 71/56 (2006.01)

Patent

CA 2021579

Abstract of the Disclosure Asymmetric, porous polyamide membranes permeable to fluid flow comprising: (A) a porous skin layer, and (B) adjacent to the skin layer, an integral, porous support layer having at least one region comprising a network of substantially parallel, hollow tube-like structures, each of the tube-like structures being oriented such that the longitudinal dimension of each tube-like structure is essentially perpendicular to the skin layer; wherein: the skin layer is relatively thin and dense compared to the support layer, the pore diameters in the skin layer are relatively small compared to the diameters of the tube-like structures in the support layer, in membranes having support layers with more than one region, the cross-sectional area of the tube-like structures is larger in regions located farther from the skin layer, and the polyamide is an aliphatic polyamide having a glass transition temperature of less than 200°C, and method of making the same. These membranes are useful in ultrafiltration and microfiltration processes.

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