Granted Patent B2

US 8,999,449 · App. 14/197,866 · Granted Apr 7, 2015

Abstract

Claims (16)

1. A method for making a composite polyamide membrane comprising a porous support and a thin film polyamide layer, wherein the method comprises the step of applying a polyfunctional amine monomer and polyfunctional acyl halide monomer to a surface of the porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, and wherein the method is characterized by including at least one of the following steps:

i) conducting the interfacial polymerization in the presence of an aromatic anhydride monomer including at least one sulfonyl halide functional group, or

ii) applying said aromatic anhydride monomer to the thin film polyamide layer.

2. The method of claim 1 wherein the step of applying the polyfunctional monomers to the surface of the porous support comprises applying a polar solution comprising the polyfunctional amine monomer and a non-polar solution comprising the polyfunctional acyl halide monomer; and wherein the non-polar solution further comprises said aromatic anhydride monomer.

3. The method of claim 1 wherein the aromatic anhydride monomer includes at least one sulfonyl chloride functional group.

4. The method of claim 1 wherein the aromatic anhydride monomer includes a benzene ring moiety.

5. The method of claim 1 wherein the aromatic anhydride monomer is represented by Formula (III):

wherein the sulfonyl halide group may be located at any open position on the aromatic ring and X is a halogen.

6. The method of claim 1 wherein the interfacial polymerization is conducted in the presence of a compound represented by Formula (II):

wherein “P” is phosphorous, “O ” is oxygen and R 1 , R 2 and R 3 are independently selected from carbon containing moieties.

7. A method for making a composite polyamide membrane comprising a porous support and a thin film polyamide layer, wherein the method comprises the step of applying a polyfunctional amine monomer and polyfunctional acyl halide monomer to a surface of the porous support and interfacially polymerizing the monomers in the presence of a compound represented by Formula (II):

wherein “P” is phosphorous, “O” is oxygen and R 1 , R 2 and R 3 are independently selected from carbon containing moieties to form a thin film polyamide layer, and wherein the method is characterized by including at least one of the following steps:

i) conducting the interfacial polymerization in the presence of an aromatic anhydride monomer including at least one sulfonyl halide functional group, or

ii) applying said aromatic anhydride monomer to the thin film polyamide layer.

8. The method of claim 7 wherein the aromatic anhydride monomer is represented by Formula (III):

wherein the sulfonyl halide group may be located at any open position on the aromatic ring and X is a halogen.

Assignments (7)