Porous membranes for high pressure filtration
AssigneeSolvay Specialty Polymers USA, LLC
InventorEmanuele DI NICOLO'
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Abstract
The present invention relates to a porous membrane suitable for use in high pressure filtration method.
Claims16
1-15. (canceled)
A method for purifying a fluid containing at least one contaminant, said method comprising the steps of
- (I) providing a fluid containing at least one contaminant;
- (II) providing a membrane [membrane (PSP)] comprising at least one porous layer [layer (PSP)] comprising at least one aromatic sulfone polymer [polymer (SP)] and at least one polyphenylene polymer [polymer (PP)];
- (III) contacting said fluid containing at least one contaminant and said membrane (PSP) by applying a pressure higher than 1 bar to said fluid;
- and
- (IV) recovering the fluid free from said at least one contaminant.
The method according to claim 1, wherein said membrane (PSP) comprises said layer (PSP) as the only layer or said membrane (PSP) is a multi-layered membrane.
The method according to claim 1, wherein said polymer (SP) is a polymer comprising at least one group of formula —Ar—SO2—Ar′— [recurring units (RSP)], wherein Ar and Ar′, equal to or different from each other, are aromatic groups, and wherein more than 50% by moles of the recurring units of said polymer (SP) are connected by ether linkages in the main chain.
The method according to claim 1, wherein said method is for purifying non-drinkable water, said fluid is saline water or brackish water, said contaminant is the salts content dissolved into said fluid, and said membrane (PSP) is a multi-layered membrane comprising (I) a substrate layer, (II) an outer layer consisting of aromatic polyamides and (III) the layer (PSP), said layer (PSP) being interposed between said substrate layer and said outer layer.
The method according to claim 1, wherein said fluid containing at least one contaminant is a liquid phase or a gas phase.
The method according to claim 1, wherein said layer (PSP) is obtained from a [composition (C)] comprising at least one polymer (SP), at least one polymer (PP) and at least one solvent [medium (L)].
A membrane [membrane (PSP*)] comprising at least one porous layer [layer (PSP*)] obtained from a composition [composition (C*)] comprising at least one sulfone polymer [polymer (SP)] in an amount of from 7 to 60 wt. % based on the total weight of said composition (C*), at least one polyphenylene polymer [polymer (PP)] in an amount of from 0.1 to less than 30 wt. % based on the total weight of said composition (C*), and at least one solvent [medium (L)] in an amount of from 10 to 92.9 wt. % based on the weight of said composition (C*).
Dependencies are inferred from the claim text.