Polyethersulfone filtration membrane

Patent metadata

Field	Value
Publication number	US-9844756-B2
Application number	US-201314386582-A
Country	US
Kind code	B2
Filing date	Mar 12, 2013
Priority date	Mar 22, 2012
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

Provided herein are filtration membranes, method of manufacturing said membranes and use of such membranes for the removal of substances from fluids or substances.

First claim

What is claimed is:

1. A filtration membrane prepared according to a method comprising: (i) providing a solution comprising: (a) a polymer selected from the group consisting of polyethersulfone (PES), polysulfone, and any combinations thereof; and (b) a dopant, wherein the dopant is sodium hexametaphosphate (SHMP); and (ii) casting the solution to form a film or membrane.

2. The method of claim 1 , wherein said casting the solution comprises subjecting the solution to a diffusion induced phase separation.

3. The method of claim 2 , wherein the diffusion-induced phase separation is performed by a solvent phase inversion process.

4. The method of claim 1 , wherein amount of the dopant in the solution is about 0.1% to about 25% wt/wt of the polymer in the solution.

5. The method of claim 4 , wherein amount of the dopant in the solution is about 0.5% to about 5% wt/wt of the polymer in the solution.

6. The method of claim 1 , wherein amount of polymer is about 1% to about 50% wt/wt of the solution.

7. The method of claim 1 , wherein the solution further comprises nanoclay.

8. The method of claim 7 , wherein the sodium hexametaphosphate and the nanoclay are present in a 10:1 to 1:10 ratio by weight or moles.

9. The method claim 8 , wherein the sodium hexametaphosphate and the nanoclay are present in a 1:1 ratio by weight or moles.

10. The filtration membrane of claim 1 , wherein the membrane further comprises nanoclay.

11. The filtration membrane claim 10 , wherein the sodium hexametaphosphate and the nanoclay are present in a 1:1 ratio by weight or moles.

12. The filtration membrane of claim 10 , wherein the sodium hexametaphosphate and the nanoclay are present in a 10:1 to 1:10 ratio by weight or moles.

13. A filtration membrane comprising: (a) a polymer selected from the group consisting of polyethersulfone, polysulfone, and any combinations thereof; and (b) a dopant, wherein the dopant is sodium hexametaphosphate (SHMP).

14. The filtration membrane of claim 13 , wherein amount of the dopant in the membrane is about 0.1% to about 25% wt/wt of the polymer in the membrane.

15. The filtration membrane of claim 14 , wherein amount of the dopant in the membrane is about 0.5% to about 5% wt/wt of the polymer in the membrane.

16. A process for filtering an aqueous fluid comprising causing the fluid to flow through a filtration membrane of claim 13 .

Assignees

• Harvard College

Inventors

• Vecitis Chad D
• Mierzwa Jose Carlos

Classifications

• B01D71/82

  characterised by the presence of specified groups, e.g. introduced by chemical after-treatment · CPC title

• B01D71/68 Primary

  Polysulfones; Polyethersulfones · CPC title

• B01D67/0013 Primary

  Casting processes · CPC title

• B01D67/003 Primary

  by selective elimination of components, e.g. by leaching · CPC title