High flux thin-film composite forward osmosis and pressure-retarded osmosis membranes
US-9156006-B2 · Oct 13, 2015 · US
Method of manufacturing reverse osmosis membrane, and reverse osmosis membrane manufactured thereby
US9643209B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9643209-B2 |
| Application number | US-201414586825-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 30, 2014 |
| Priority date | May 24, 2012 |
| Publication date | May 9, 2017 |
| Grant date | May 9, 2017 |
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- Title
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- Abstract
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Abstract
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There are provided a method of manufacturing a reverse osmosis membrane and a reverse osmosis membrane manufactured thereby. The method includes forming a polysulfone layer by applying a solution including a mixed solvent containing two or more solvents having different solubility parameter values to a surface of a porous support; and forming an active layer on the polysulfone layer.
First claim
Opening claim text (preview).
What is claimed is: 1. A method of manufacturing a reverse osmosis membrane, the method comprising: forming a polysulfone layer with a plurality of pores by applying a solution including a polymer having a sulfonic acid group and a mixed solvent containing first and second solvents having different solubility parameter values to a surface of a porous support; and forming a polyamide active layer on the polysulfone layer, wherein the first solvent is N,N-dimethylformamide (DMF), and the second solvent is γ-butyrolactone (GBL), the first solvent and the second solvent being mixed in a ratio of 80:20 to 60:40, and wherein a percentage of the plurality of pores having a diameter of 40 nm or greater in the surface of the polysulfone layer is from 0.20 to 0.28%. 2. The method of claim 1 , wherein the solution comprises: the polymer having a sulfonic acid group in an amount of 5 to 45 parts by weight, based on 100 parts by weight of the solution; and the first and second solvents in an amount of 55 to 95 parts by weight, based on 100 parts by weight of the solution.
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Inventors
Classifications
Polyamides, e.g. polyester-amides · CPC title
Polysulfones; Polyethersulfones · CPC title
Pretreatment of the substrate · CPC title
- B05D5/00Primary
Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures · CPC title
- B01D61/025Primary
Reverse osmosis; Hyperfiltration · CPC title
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Frequently asked questions
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- What does patent US9643209B2 cover?
- There are provided a method of manufacturing a reverse osmosis membrane and a reverse osmosis membrane manufactured thereby. The method includes forming a polysulfone layer by applying a solution including a mixed solvent containing two or more solvents having different solubility parameter values to a surface of a porous support; and forming an active layer on the polysulfone layer.
- Who is the assignee on this patent?
- Lg Chemical Ltd
- What technology area does this patent fall under?
- Primary CPC classification B05D5/00. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue May 09 2017 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).