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US 2006/0049094 A1Published application
Membrane for tangential filtration and production method thereof
OwnerPhilippe Lescocheinventor
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OwnerPhilippe Lescocheinventor
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Membrane for the tangential filtration of a fluid, said membrane comprising a porous support (2) delimiting at least one flow channel (3) for the fluid flowing in a given direction (f) between an inlet (6) and an outlet (7), the inner surface (4) of the porous support (2) which delimits channel (3) being coated with at least one separator layer (5) for the fluid, characterized in that the support has variable partial pore-filling (c) extending from the inner surface (4) of support (2) on which the separator layer (5) is deposited, said variable partial pore-filling creating a mean porosity gradient on portion (8) of support (2) of given constant thickness (e) extending from the inner surface (4) of support (2), the minimum mean porosity being located at the inlet (6) and the maximum mean porosity at the outlet (7).
Membrane for tangential filtration of a fluid to be treated, said membrane comprising a porous support (2) delimiting at least one flow channel (3) for the fluid to be treated flowing in a given direction(f) between an inlet (6) and an outlet (7), the inner surface (4) of the porous support (2) which delimits channel (3) being coated with at least one separator layer (5) for the fluid to be treated, a fraction called a permeate passing through the separator layer (5) and the porous support (2), characterized in that the support has variable, partial pore-filling (c) extending from the inner surface (4) of support (2) on which the separator layer (5) is deposited, this said partial pore-filling, on a portion (8) of support (2) of a given constant thickness (e) extending from the inner surface (4) of support (2), creating a mean porosity gradient in the direction of flow of the fluid to be treated, the minimum mean porosity being located at the inlet(6) and the maximum mean porosity at the outlet (7).
Method for fabricating a membrane for the tangential filtration of a fluid to be treated, comprising a porous support (2) delimiting at least one flow channel (3) for the fluid to be treated flowing in a given direction (f) between an inlet (6) and an outlet (7), the inner surface (4) of the porous support (2) which delimits the channel (3) being coated with at least one separator layer (5) for the fluid to be treated, characterized in that it comprises a step consisting of modifying the porous support (2) by the penetration, from the inner surface (4) of porous support (2) delimiting channel (3), of inorganic particles whose mean diameter is smaller than the mean pore diameter dp of the support (2), so that on a portion (8) of a given constant thickness (e) extending from the inner surface (4) of support (2), it is possible to obtain a mean porosity gradient in the direction of flow of the fluid to be treated, the minimum mean porosity being located at the inlet (6) and the maximum mean porosity at the outlet (7).
Dependencies are inferred from the claim text.