Selectively permeable graphene oxide element

Patent metadata

Field	Value
Publication number	US-10773218-B2
Application number	US-201815915459-A
Country	US
Kind code	B2
Filing date	Mar 8, 2018
Priority date	Sep 10, 2015
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

Described herein is a graphene material such as graphene oxide and polymer based selectively permeable element that provides selective permeability between polar and non-polar molecules such as fluid, gas or vapor. The methods for making these selectively permeable elements and related devices are also described.

First claim

What is claimed is:

1. A dehydration membrane comprising:
a support;
a composite comprising a graphene oxide compound and a polyvinyl alcohol;
wherein the composite is coated on the support; and
wherein a first property of the membrane is that the membrane has a moisture permeability of greater than 2 g/m 2 ·day and a second property of the membrane is that the membrane has gas permeability of less than 0.1 cc/m 2 ·day;
wherein the graphene oxide compound is present at 0.1% to 10% by weight as compared to the weight of the total weight of the graphene oxide compound and the polyvinyl alcohol;
wherein the composite is in the form of a film having a thickness of 1 to 50 μm; and
wherein the gas is non-polar.

2. The membrane of claim 1 , wherein the gas is inert.

3. The membrane of claim 1 , wherein the support is porous.

4. The membrane of claim 1 , wherein the support comprises polyamide, polyvinylidene fluoride, polyethylene terephthalate, polysulfone, polyether sulfone, polypropylene, polyethylene, or a mixture thereof.

5. The membrane of claim 1 , wherein the graphene oxide compound and polyvinyl alcohol are crosslinked.

6. The membrane of claim 1 , wherein the graphene oxide compound is present at about 0.1% to about 10% by weight as compared to the weight of the polyvinyl alcohol.

7. The membrane of claim 1 , wherein the graphene oxide compound is graphene oxide, reduced-graphene oxide, functionalized graphene oxide, or functionalized and reduced-graphene oxide.

8. The membrane of claim 1 , wherein the graphene oxide compound has a platelet-like particle having a size from about 0.05 μm to about 100 μm.

9. The membrane of claim 1 , wherein the composite further comprises lithium chloride.

10. The membrane of claim 1 , wherein the composite further comprises polyethylene glycol.

11. The membrane of claim 1 , wherein the composite is in the form of a film having a thickness of about 5 μm.

12. A method of dehydrating a first gas, comprising applying a pressure gradient across the dehydration membrane of claim 1 to cause water vapor to selectively pass through the dehydration membrane, wherein the first gas applies a higher pressure to a first side of the membrane than a pressure applied by a second gas to a second side of the membrane, so that water vapor passes through the dehydration membrane from the first gas into the second gas.

13. The method of claim 12 , wherein the first gas is inert.

14. The method of claim 12 , wherein the first gas is non-polar.

15. The method of claim 12 , wherein the first gas is air, oxygen or nitrogen.

16. A device for dehydrating a gas comprising:
a dehydration membrane of claim 1 , wherein the dehydration membrane further comprises a first side of the dehydration membrane disposed opposite to a second side of the dehydration membrane; and
a chamber configured to contain the gas to be dehydrated which is in fluid communication with the first side of the dehydration membrane;
wherein the device is configured so that, when the device is in use, the first side of the dehydration membrane is under a higher pressure than the second side of the dehydration membrane.

17. The device of claim 16 , wherein the gas to be dehydrated is non-polar.

18. The device of claim 16 , wherein the gas to be dehydrated is inert.

19. The device of claim 16 , wherein the gas is air, oxygen or nitrogen.

Assignees

• Nitto Denko Corp

Inventors

• Zheng Shijun
• Wang Peng
• Romero Rebecca
• Kitahara Isamu
• Lin Weiping

Classifications

• B01D67/00793

  Dispersing a component, e.g. as particles or powder, in another component · CPC title

• B01D71/024

  Oxides · CPC title

• B01D61/363

  Vapour permeation · CPC title

• B01D71/381

  Polyvinylalcohol · CPC title

• B01D71/0211

  Graphene or derivates thereof · CPC title