Composite polyamide membrane derived from an aliphatic acyclic tertiary amine compound
View Patent ↗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 polar solution including a polyfunctional amine monomer and non-polar solution including a polyfunctional acyl halide monomer to a surface of the porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, wherein the method is characterized by the step of applying a non-polar solution comprising an aliphatic acyclic tertiary amine compound to the support.
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 polar solution comprising a polyfunctional amine monomer and non-polar solution comprising a polyfunctional acyl halide monomer to a surface of the porous support and interfacially polymerizing the monomers to form a thin film polyamide layer, wherein the method is characterized by the step of applying a non-polar solution comprising an aliphatic acyclic tertiary amine compound to the support,
wherein the aliphatic acyclic tertiary amine compound is represented by Formula I:
wherein R 1 , R 2 and R 3 are independently selected from hydrocarbyl groups comprising from 1 to 20 carbon atoms.
2. The method of claim 1 wherein the step of applying the non-polar solution comprising an aliphatic acyclic tertiary amine compound is performed after the formation of the thin film polyamide layer.
3. The method of claim 1 wherein the step of applying the non-polar solution comprising an aliphatic acyclic tertiary amine compound comprises adding the aliphatic acyclic tertiary amine compound to the non-polar solution that comprises the polyfunctional acyl halide monomer and applying both the polyfunctional acyl halide monomer and aliphatic acyclic tertiary amine compound from a single non-polar solution.
4. The method of claim 1 wherein the concentration of the aliphatic acyclic tertiary amine compound is from 0.01 to 50 mMol/L.
5. The method of claim 1 wherein the aliphatic acyclic tertiary amine compound comprises a single nitrogen atom.
6. The method of claim 1 wherein R 1 , R 2 and R 3 are independently selected from aliphatic comprising from 1 to 12 carbon atoms.
7. The method of claim 1 wherein R 1 , R 2 and R 3 are independently selected from alkyl groups comprising from 1 to 12 carbon atoms.
8. The method of claim 1 wherein R 1 , R 2 and R 3 collectively comprise at least 4 carbon atoms.
9. The method of claim 1 wherein R 1 , R 2 and R 3 collectively comprise at least 6 carbon atoms.