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US-2020261858-A1 · Aug 20, 2020 · US
Reverse osmosis membrane and method for producing reverse osmosis membrane
US11452973B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11452973-B2 |
| Application number | US-201916771091-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 24, 2019 |
| Priority date | Jan 24, 2018 |
| Publication date | Sep 27, 2022 |
| Grant date | Sep 27, 2022 |
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- Title
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- Abstract
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Abstract
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A reverse osmosis membrane of the present invention includes a porous support substrate (2) and a separation active layer (3) formed on a surface of the porous support substrate (2) and formed of a carbon film containing organized carbon.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for producing a reverse osmosis membrane, the method comprising: a coating film forming step of forming a coating film soluble in a predetermined solvent on a surface of a porous support substrate insoluble in the solvent; a pre-carbon film forming step of forming a pre-carbon film on the coating film by a physical vapor deposition method using carbon as a target material under an atmosphere containing nitrogen gas together with a noble gas, wherein a ratio of the noble gas:the nitrogen gas is 1:0.1 to 1:10; a coating film removal step of dissolving and removing the coating film with the solvent after the pre-carbon film is formed; and an organization step of compressing the pre-carbon film by applying a pressure to the pre-carbon film by using pure water of 5.5 MPa or greater for 20 hours or longer to form a separation active layer formed of a carbon film containing organized carbon. 2. The method according to claim 1 , wherein, in the coating film removal step, the coating film is dissolved and removed from a laminate of the porous support substrate, the coating film, and the pre-carbon film while being immersed in the solvent. 3. The method according to claim 2 , wherein, in the coating film removal step, the solvent with the laminate immersed therein is shaken. 4. The method according to any one of claim 1 , wherein the porous support substrate includes a nonwoven backing layer and a porous plastic layer on a surface of the backing layer, and wherein, in the coating film forming step, the coating film is formed on the porous plastic layer. 5. The method according to any one of claim 2 , wherein the porous support substrate includes a nonwoven backing layer and a porous plastic layer on a surface of the backing layer, and wherein, in the coating film forming step, the coating film is formed on the porous plastic layer. 6. The method according to any one of claim 3 , wherein the porous support substrate includes a nonwoven backing layer and a porous plastic layer on a surface of the backing layer, and wherein, in the coating film forming step, the coating film is formed on the porous plastic layer.
Assignees
Inventors
Classifications
by deposition from the gaseous phase, e.g. sputtering, CVD, PVD · CPC title
Separation of the coating from the substrate · CPC title
Specific pressure applied · CPC title
Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title
Carbon · CPC title
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Frequently asked questions
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- What does patent US11452973B2 cover?
- A reverse osmosis membrane of the present invention includes a porous support substrate (2) and a separation active layer (3) formed on a surface of the porous support substrate (2) and formed of a carbon film containing organized carbon.
- Who is the assignee on this patent?
- Kitagawa Ind Co Ltd, Univ Shinshu
- What technology area does this patent fall under?
- Primary CPC classification B01D61/025. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Sep 27 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).