Selectively permeable polymeric membrane

Patent metadata

Field	Value
Publication number	US-2022016570-A1
Application number	US-201917414812-A
Country	US
Kind code	A1
Filing date	Dec 12, 2019
Priority date	Dec 17, 2018
Publication date	Jan 20, 2022
Grant date	—

Abstract

Described herein are polymeric based composite membranes that provide selective resistance for gases while providing water vapor permeability. Such composite membranes have a high water/air selectivity in permeability. The methods for making such membranes and using the membranes for dehydrating or removing water vapor from gases are also described.

First claim

What is claimed is:

1 . A dehydration membrane comprising:
a porous support; and a composite coated on the porous support, wherein the composite comprises a polyether block amide (PEBA), a poly(diallyldimethylammonium chloride)(PDADMA), a poly(acrylamide-co-diallyldimethylammonium chloride)(PACD), a poly(sodium 4-styrenesulfonate)(PSS), or a combination thereof.

2 . The dehydration membrane of claim 1 , wherein the composite comprises the PEBA.

3 . The dehydration membrane of claim 2 , wherein the PEBA has a weight ratio of poly(ethylene oxide) to polyamide that is about 1.5.

4 . The dehydration membrane of claim 1 , wherein the composite comprises the PDADMA, and the molecular weight of the PDADMA is less than 100,000 Da.

5 . The dehydration membrane of claim 1 , wherein the composite comprises the PACD.

6 . The dehydration membrane of claim 1 , wherein the composite comprises the PSS.

7 . The dehydration membrane of claim 1 , wherein the composite is a layer that has a thickness of about 1 μm to about 10 μm.

8 . The dehydration membrane of claim 7 , wherein the composite is a layer that has a thickness of about 2 μm to about 5 μm.

9 . The dehydration membrane of claim 1 , wherein the dehydration membrane has a water vapor transmission rate that is at least 1,000 g/m 2 /day as determined by ASTM E96 standard method.

10 . The dehydration membrane of claim 1 , wherein the dehydration membrane has a gas permeance that is less than 0.001 L/m 2 s Pa as determined by the Differential Pressure Method.

11 . The dehydration membrane of claim 1 , wherein the porous support comprises stretched polypropylene or stretched polyethylene.

12 . A dehydration membrane comprising:
a porous support; and a composite coated on the porous support comprising a polyether block amide (PEBA).

13 . The dehydration membrane of claim 12 , wherein the porous support comprises polyethylene.

14 . The dehydration membrane of claim 12 or 13 , wherein the porous support comprises polypropylene or stretched polypropylene.

15 . A method for dehydrating a gas comprising:
applying a first gas to the dehydration membrane of claim 1 ; allowing water vapor to pass through the dehydration membrane and to be removed; and generating a second gas that has lower water vapor content than the first gas.

16 . A method of making a dehydration membrane comprising:
curing an aqueous mixture that is coated onto a porous support; wherein the aqueous mixture that is coated onto the porous support is dried at a temperature of 60° C. to 100° C. for about 30 seconds to about 3 hours; wherein the porous support is coated with the aqueous mixture by applying the aqueous mixture to the porous support, and repeating as necessary to achieve a layer of coating having a thickness of about 100 nm to about 10000 nm; and wherein the aqueous mixture is formed by mixing a PEBA, a PDADMA, a PACD, a PSS, or a combination thereof, in an aqueous liquid.

17 . The method of claim 16 , wherein the aqueous mixture comprises a solvent mixture that contains ethanol and water.

18 . The method of claim 1 , wherein the porous support is coated at a coating speed that is 0.5 to 15 meter/min to achieve a layer of coating having a thickness of about 1 μm to about 10 μm.

19 . An energy recovery ventilator system comprising the dehydration membrane of claim 1 .

Assignees

• Nitto Denko Corp

Inventors

• Zheng Shijun
• Lin Weiping
• Wang Peng
• Kitahara Isamu
• Bagge Bita
• Ericson John
• Hsieh Wanyun
• Yamashiro Yuji
• Kondo Takashi

Classifications

• B01D71/5211

  Polyethylene glycol or polyethyleneoxide · CPC title

• B01D69/1071

  Woven, non-woven or net mesh · CPC title

• B01D71/5222

  Polyetherketone, polyetheretherketone, or polyaryletherketone · CPC title

• B01D69/12

  Composite membranes; Ultra-thin membranes · CPC title

• B01D2325/20

  Specific permeability or cut-off range · CPC title