Thin film composite membrane derived from tetra-functional acyl halide monomer
View Patent ↗A method for making a composite polyamide membrane including a porous support and a thin film polyamide layer, wherein the method includes the step of applying a polyfunctional amine monomer and a tetraacyl acyl halide monomer represented by Formula (I) to a surface of the porous support and interfacially polymerizing the monomers to form a thin film polyamide layer; wherein A is selected from: oxygen (—O—); carbon (—C—); silicon (—Si—); each of which may be unsubstituted or substituted, e.g. with alkyl groups of 1-4 carbon atoms; or a carbonyl group (—C(O)—), X is the same or different and is selected from a halogen, and Y is selected from halogen and hydroxide.
1. A method for making a composite polyamide membrane comprising a porous support and a thin film polyamide layer with a B value less than or equal to 0.04 gallons/ft 2 /day (GFD), wherein the method comprises the step of applying an aromatic polyfunctional amine monomer and a tetraacyl halide monomer represented by Formula (I) to a surface of the porous support and interfacially polymerizing the monomers to form a thin film polyamide layer;
wherein A is selected from: oxygen (—O—), carbon (—C—), silicon (—Si—), each of which may be unsubstituted or substituted with alkyl group having from 1 to 4 carbon atoms; or a carbonyl group (—C(O)—), X is the same or different and is selected from a halogen, and Y is selected from halogen and hydroxide.
2. The method of claim 1 wherein the composite membrane has a B value less than or equal to 0.03 gallons/ft 2 /day (GFD).
3. The method of claim 1 wherein the polyfunctional amine monomer comprises primary amino functional groups.
4. The method of claim 1 wherein the polyfunctional amine monomer comprises m-phenylenediamine.
5. The method of claim 1 wherein the tetraacyl halide monomer of Formula (I) is coated upon the surface of the porous support from a non-polar solution wherein the solution comprises a solvent selected from at least one of: alkylated benzene, paraffin and isoparaffin.
6. The method of claim 5 wherein the non-polar solution further comprises a polyfunctional acyl halide monomer distinct from the monomer represented by Formula (I).
7. The method of claim 5 wherein the non-polar solution further comprises trimesoyl chloride.
8. The method of claim 1 wherein the tetraacyl halide monomer is represented by Formula (V):
wherein X is the same or different and is selected from a halogen, and Y is selected from halogen and hydroxide.